ORCID Profile
0000-0001-9294-5180
Current Organisation
Queensland University of Technology
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Electrochemistry | Functional Materials | Materials Engineering | Sensor Technology (Chemical aspects) | Physical Chemistry (Incl. Structural) | Analytical Chemistry | Catalysis and Mechanisms of Reactions | Colloid and Surface Chemistry | Environmental Technologies | Environmental Engineering | Mechanical Engineering not elsewhere classified | Materials Engineering not elsewhere classified | Nanomanufacturing | Nanomaterials | Energy Generation, Conversion and Storage Engineering | Nanotechnology | Surfaces and Structural Properties of Condensed Matter | Plasma Physics; Fusion Plasmas; Electrical Discharges
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Chemical Sciences | Renewable Energy not elsewhere classified | Expanding Knowledge in Technology | Expanding Knowledge in Engineering | Urban and Industrial Air Quality | Organic Industrial Chemicals (excl. Resins, Rubber and Plastics) | National Security | Hydrogen Production from Renewable Energy | Fuel Cells (excl. Solid Oxide) | Physical and Chemical Conditions of Water for Urban and Industrial Use | Expanding Knowledge in the Physical Sciences | Scientific Instruments | Management of Gaseous Waste from Manufacturing Activities (excl. Greenhouse Gases) |
Related Links
Publications
Density Functional Theory Study of Two-Dimensional Post-Transition Metal Chalcogenides and Halides for Interfacial Charge Transport in Perovskite Solar Cells
Publisher: American Chemical Society (ACS)
Date: 20-09-2022
Large amplitude fourier transformed AC voltammetric investigation of the active state electrochemistry of a copper/aqueous base interface and implications for electrocatalysis
Publisher: American Chemical Society (ACS)
Date: 20-07-2011
DOI: 10.1021/LA2017819
Abstract: The higher harmonic components available from large- litude Fourier-transformed alternating current (FT-ac) voltammetry enable the surface active state of a copper electrode in basic media to be probed in much more detail than possible with previously used dc methods. In particular, the absence of capacitance background current allows low-level Faradaic current contributions of fast electron-transfer processes to be detected these are usually completely undetectable under conditions of dc cyclic voltammetry. Under high harmonic FT-ac voltammetric conditions, copper electrodes exhibit well-defined and reversible premonolayer oxidation responses at potentials within the double layer region in basic 1.0 M NaOH media. This process is attributed to oxidation of copper adatoms (Cu*) of low bulk metal lattice coordination numbers to surface-bonded, reactive hydrated oxide species. Of further interest is the observation that cathodic polarization in 1.0 M NaOH significantly enhances the current detected in each of the fundamental to sixth FT-ac harmonic components in the Cu*/Cu hydrous oxide electron-transfer process which enables the underlying electron transfer processes in the higher harmonics to be studied under conditions where the dc capacitance response is suppressed the results support the incipient hydrous oxide adatom mediator (IHOAM) model of electrocatalysis. The underlying quasi-reversible interfacial Cu*/Cu hydrous oxide process present under these conditions is shown to mediate the reduction of nitrate at a copper electrode, while the mediator for the hydrazine oxidation reaction appears to involve a different mediator or active state redox couple. Use of FT-ac voltammetry offers prospects for new insights into the nature of active sites and electrocatalysis at the electrode/solution interface of Group 11 metals in aqueous media.
Engineering electrodeposited ZnO films and their memristive switching performance
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CP44451A
Abstract: We report the influence of zinc oxide (ZnO) seed layers on the performance of ZnO-based memristive devices fabricated using an electrodeposition approach. The memristive element is based on a sandwich structure using Ag and Pt electrodes. The ZnO seed layer is employed to tune the morphology of the electrodeposited ZnO films in order to increase the grain boundary density as well as construct highly ordered arrangements of grain boundaries. Additionally, the seed layer also assists in optimizing the concentration of oxygen vacancies in the films. The fabricated devices exhibit memristive switching behaviour with symmetrical and asymmetrical hysteresis loops in the absence and presence of ZnO seed layers, respectively. A modest concentration of oxygen vacancy in electrodeposited ZnO films as well as an increase in the ordered arrangement of grain boundaries leads to higher switching ratios in Ag/ZnO/Pt devices.
The effect of electrode material on the electrochemical formation of porous copper surfaces using hydrogen bubble templating
Publisher: Elsevier BV
Date: 05-2014
Pulsing Liquid Alloys for Nanomaterials Synthesis
Publisher: American Chemical Society (ACS)
Date: 11-09-2020
Publisher Correction: Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces
Publisher: Springer Science and Business Media LLC
Date: 20-03-2019
DOI: 10.1038/S41467-019-09228-4
Abstract: The original version of this Article contained errors in the author affiliations. Affiliation 1 incorrectly read ‘School of Chemical Engineering, University of New South Wales (UNSW), Sydney, NSW 2031, Australia’ and affiliation 4 incorrectly read ‘School of Engineering, RMIT University, Melbourne, VIC 3001, Australia.’ This has now been corrected in both the PDF and HTML versions of the Article.
Gold nanospikes formed through a simple electrochemical route with high electrocatalytic and surface enhanced Raman scattering activity
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B910830K
Abstract: We demonstrate a simple electrochemical route to produce uniformly sized gold nanospikes without the need for a capping agent or prior modification of the electrode surface, which are predominantly oriented in the {111} crystal plane and exhibit promising electrocatalytic and SERS properties.
Nanostructured copper oxide semiconductors: A perspective on materials, synthesis methods and applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TC00345D
Abstract: The oxides of copper (Cu x O) are fascinating materials due to their remarkable optical, electrical, thermal and magnetic properties.
The active site behaviour of electrochemically synthesised gold nanomaterials
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1FD00017A
Abstract: Even though gold is the noblest of metals, a weak chemisorber and is regarded as being quite inert, it demonstrates significant electrocatalytic activity in its nanostructured form. It is demonstrated here that nanostructured and even evaporated thin films of gold are covered with active sites which are responsible for such activity. The identification of these sites is demonstrated with conventional electrochemical techniques such as cyclic voltammetry as well as a large litude Fourier transformed alternating current (FT-ac) method under acidic and alkaline conditions. The latter technique is beneficial in determining if an electrode process is either Faradaic or capacitive in nature. The observed behaviour is analogous to that observed for activated gold electrodes whose surfaces have been severely disrupted by cathodic polarisation in the hydrogen evolution region. It is shown that significant electrochemical oxidation responses occur at discrete potential values well below that for the formation of the compact monolayer oxide of bulk gold and are attributed to the facile oxidation of surface active sites. Several electrocatalytic reactions are explored in which the onset potential is determined by the presence of such sites on the surface. Significantly, the facile oxidation of active sites is used to drive the electroless deposition of metals such as platinum, palladium and silver from their aqueous salts on the surface of gold nanostructures. The resultant surface decoration of gold with secondary metal nanoparticles not only indicates regions on the surface which are rich in active sites but also provides a method to form interesting bimetallic surfaces.
Anion effect on lithium electrodeposition from N ‐propyl‐ N ‐methylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid electrolytes
Publisher: Elsevier BV
Date: 10-2016
Morphology Changes and Mechanistic Aspects of the Electrochemically-Induced Reversible Solid−Solid Transformation of Microcrystalline TCNQ into Co[TCNQ]2-Based Materials (TCNQ = 7,7,8,8-Tet
Publisher: American Chemical Society (ACS)
Date: 12-08-2006
DOI: 10.1021/CM060852J
The facile formation of silver dendritic structures in the absence of surfactants and their electrochemical and SERS properties
Publisher: Elsevier BV
Date: 08-2011
2D MXenes: A New Family of Promising Catalysts for the Hydrogen Evolution Reaction
Publisher: American Chemical Society (ACS)
Date: 14-12-2016
Probing the effect of metal to ligand charge transfer on the oxygen evolution reaction in Au incorporated Co(OH)2 thin film electrocatalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TA03923D
Creating gold nanoprisms directly on quartz crystal microbalance electrodes for mercury vapor sensing
Publisher: IOP Publishing
Date: 07-2011
DOI: 10.1088/0957-4484/22/30/305501
Abstract: A novel electrochemical route is used to form highly {111}-oriented and size-controlled Au nanoprisms directly onto the electrodes of quartz crystal microbalances (QCMs) which are subsequently used as mercury vapor sensors. The Au nanoprism loaded QCM sensors exhibited excellent response-concentration linearity with a response enhancement of up to ∼ 800% over a non-modified sensor at an operating temperature of 28 °C. The increased surface area and atomic-scale features (step/defect sites) introduced during the growth of nanoprisms are thought to play a significant role in enhancing the sensing properties of the Au nanoprisms toward Hg vapor. The sensors are shown to have excellent Hg sensing capabilities in the concentration range of 0.123-1.27 ppm(v) (1.02-10.55 mg m(-3)), with a detection limit of 2.4 ppb(v) (0.02 mg m(-3)) toward Hg vapor when operating at 28 °C, and 17 ppb(v) (0.15 mg m(-3)) at 89 °C, making them potentially useful for air monitoring applications or for monitoring the efficiency of Hg emission control systems in industries such as mining and waste incineration. The developed sensors exhibited excellent reversible behavior (sensor recovery) within 1 h periods, and crucially were also observed to have high selectivity toward Hg vapor in the presence of ethanol, ammonia and humidity, and excellent long-term stability over a 33 day operating period.
Activating Iron Based Materials for Overall Electrochemical Water Splitting via the Incorporation of Noble Metals
Publisher: Wiley
Date: 17-11-2020
Formation of nanostructured porous Cu–Au surfaces: the influence of cationic sites on (electro)-catalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR31409F
Abstract: The fabrication of nanostructured bimetallic materials through electrochemical routes offers the ability to control the composition and shape of the final material that can then be effectively applied as (electro)-catalysts. In this work a clean and transitory hydrogen bubble templating method is employed to generate porous Cu-Au materials with a highly anisotropic nanostructured interior. Significantly, the co-electrodeposition of copper and gold promotes the formation of a mixed bimetallic oxide surface which does not occur at the in idually electrodeposited materials. Interestingly, the surface is dominated by Au(I) oxide species incorporated within a Cu(2)O matrix which is extremely effective for the industrially important (electro)-catalytic reduction of 4-nitrophenol. It is proposed that an aurophilic type of interaction takes place between both oxidized gold and copper species which stabilizes the surface against further oxidation and facilitates the binding of 4-nitrophenol to the surface and increases the rate of reaction. An added benefit is that very low gold loadings are required typically less than 2 wt% for a significant enhancement in performance to be observed. Therefore the ability to create a partially oxidized Cu-Au surface through a facile electrochemical route that uses a clean template consisting of only hydrogen bubbles should be of benefit for many more important reactions.
Celebrating Professor Alan Bond’s 70th Birthday
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/CHV70N9_FO
Enhancing the current density of electrodeposited ZnO-Cu 2 O solar cells by engineering their heterointerfaces
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM35682A
Self-adhesive flexible patches of oxide heterojunctions with tailored band alignments for electrocatalytic H2O2 generation
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA06473H
Abstract: This work reports fabrication of centimetre-size, flexible, self-adhesive ZnO-based heterojunction patches with a tuned electronic band and outstanding electrochemical activity, offering promising alternatives for noble electrocatalysts such as Pt.
Direct electrochemical formation of alloyed AuPt nanostructured electrocatalysts for the oxidation of formic acid
Publisher: Elsevier BV
Date: 2014
Electrochemically Fabricated Ni−P, Ni−S and Ni−Se Materials for Overall Water Splitting: Investigating the Concept of Bifunctional Electrocatalysis
Publisher: Wiley
Date: 07-03-2019
Mechanically Robust Tapioca Starch Composite Binder with Improved Ionic Conductivity for Sustainable Lithium-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 11-06-2020
Thin films and nanostructures of niobium pentoxide: Fundamental properties, synthesis methods and applications
Publisher: Royal Society of Chemistry (RSC)
Date: 24-07-2014
DOI: 10.1039/C4TA02561J
Preparation of a one-dimensional hierarchical MnO@CNT@Co–N/C ternary nanostructure as a high-performance bifunctional electrocatalyst for rechargeable Zn–air batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA07259E
Abstract: A MnO@CNT@Co–N/C bifunctional electrocatalyst is prepared that is active for both the OER and ORR and employed as an electrode in a Zn–air battery that shows superior performance in terms of power density and cyclability over a commercial electrode.
Volcano relationships and a new activity descriptor of 2D transition metal–Fe layered double hydroxides for efficient oxygen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2MH01217K
Abstract: In two-dimensional (2D) Fe-doped MFe-LDHs, volcano-shaped relationships between the catalytic activity descriptors and the Fe contents are identified, and a new activity descriptor, the intermediate adsorption capacitance (CPE ad ), is proposed.
Influence of SiC reinforcement content and heat treatment on the corrosion behavior of pulsed electrodeposited Ni-W alloy metal matrix composite
Publisher: Elsevier BV
Date: 05-2022
A multifunctional gold doped Co(OH)2electrocatalyst tailored for water oxidation, oxygen reduction, hydrogen evolution and glucose detection
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA08928G
Abstract: Electrocatalytic reactions are central to many energy and sensing applications and therefore the development of materials that show functionality for more than one reaction are of significant interest.
Electrochemical properties of galvanically replaced iron nanocubes with gold and palladium
Publisher: Elsevier BV
Date: 11-2010
Applications of liquid metals in nanotechnology
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1NH00594D
Abstract: This review presents the fascinating properties and emerging applications of liquid metals and alloys at the nanoscale.
A Combined Scanning Electron Micrograph and Electrochemical Study of the Effect of Chemical Interaction on the Cyclability of Lithium Electrodes in an Ionic Liquid Electrolyte
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/CH12334
Abstract: The effect of storage time on the cyclability of lithium electrodes in an ionic liquid electrolyte, namely 0.5 m LiBF4 in N-methyl-N-propyl pyrrolidinium bis(fluorosulfonyl)imide, [C3mpyr+][FSI–], was investigated. A chemical interaction was observed which is time dependent and results in a morphology change of the Li surface due to build up of passivation products over a 12‐day period. The formation of this layer significantly impacts on the Li electrode resistance before cycling and the charging/discharging process for symmetrical Li|0.5 m LiBF4 in [C3mpyr+][FSI–]|Li coin cells. Indeed it was found that introducing a rest period between cycling, and thereby allowing the chemical interaction between the Li electrode and electrolyte to take place, also impacted on the charging/discharging process. For all Li surface treatments the electrode resistance decreased after cycling and was due to significant structural rearrangement of the surface layer. These results suggest that careful electrode pretreatment in a real battery system will be required before operation.
A new model for predicting the grain size of electrodeposited nanocrystalline nickel coatings containing sulphur, phosphorus or boron based on typical systems
Publisher: Elsevier BV
Date: 2019
Collisional electrochemistry of laser-ablated gold nanoparticles by electrocatalytic oxidation of glucose
Publisher: Elsevier BV
Date: 04-2017
Anodic formation of a thick three-dimensional nanoporous WO3 film and its photocatalytic property
Publisher: Elsevier BV
Date: 02-2013
A study of the galvanic replacement reaction at surfaces and the role of lateral charge propagation
Publisher: Elsevier BV
Date: 2012
Computational Design and Experimental Validation of Enzyme Mimicking Cu-Based Metal–Organic Frameworks for the Reduction of CO2 into C2 Products: C–C Coupling Promoted by Ligand
Publisher: American Chemical Society (ACS)
Date: 25-09-2023
DOI: 10.1021/JACS.3C07108
Probing the effect of charge transfer enhancement in off resonance mode SERS via conjugation of the probe dye between silver nanoparticles and metal substrates
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CP51646F
Abstract: The charge transfer-mediated surface enhanced Raman scattering (SERS) of crystal violet (CV) molecules that were chemically conjugated between partially polarized silver nanoparticles and optically smooth gold and silver substrates has been studied under off-resonant conditions. Tyrosine molecules were used as a reducing agent to convert silver ions into silver nanoparticles where oxidised tyrosine caps the silver nanoparticle surface with its semiquinone group. This binding through the quinone group facilitates charge transfer and results in partially oxidised silver. This establishes a chemical link between the silver nanoparticles and the CV molecules, where the positively charged central carbon of CV molecules can bind to the terminal carboxylate anion of the oxidised tyrosine molecules. After drop casting Ag nanoparticles bound with CV molecules it was found that the free terminal amine groups tend to bind with the underlying substrates. Significantly, only those CV molecules that were chemically conjugated between the partially polarised silver nanoparticles and the underlying gold or silver substrates were found to show SERS under off-resonant conditions. The importance of partial charge transfer at the nanoparticle/capping agent interface and the resultant conjugation of CV molecules to off resonant SERS effects was confirmed by using gold nanoparticles prepared in a similar manner. In this case the capping agent binds to the nanoparticle through the amine group which does not facilitate charge transfer from the gold nanoparticle and under these conditions SERS enhancement in the sandwich configuration was not observed.
Galvanic replacement of liquid metal Galinstan with copper for the formation of photocatalytically active nanomaterials
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NJ02652B
Abstract: Galvanic replacement of liquid metal Galinstan under mechanical agitation with copper creates a multi-elemental system that is photocatalytically active for the degradation of organic dyes where reuseability is achieved via immobilisation on a solid support.
Premonolayer Oxidation of Nanostructured Gold: An Important Factor Influencing Electrocatalytic Activity
Publisher: American Chemical Society (ACS)
Date: 12-02-2009
DOI: 10.1021/LA8039016
Abstract: The study of the electrodeposition of polycrystalline gold in aqueous solution is important from the viewpoint that in electrocatalysis applications ill-defined micro- and nanostructured surfaces are often employed. In this work, the morphology of gold was controlled by the electrodeposition potential and the introduction of Pb(CH3COO)2 x 3H2O into the plating solution to give either smooth or nanostructured gold crystallites or large dendritic structures which have been characterized by scanning electron microscopy (SEM). The latter structures were achieved through a novel in situ galvanic replacement of lead with AuCl4-(aq) during the course of gold electrodeposition. The electrochemical behavior of electrodeposited gold in the double layer region was studied in acidic and alkaline media and related to electrocatalytic performance for the oxidation of hydrogen peroxide and methanol. It was found that electrodeposited gold is a significantly better electrocatalyst than a polished gold electrode however, performance is highly dependent on the chosen deposition parameters. The fabrication of a deposit with highly active surface states, comparable to those achieved at severely disrupted metal surfaces through thermal and electrochemical methods, does not result in the most effective electrocatalyst. This is due to significant premonolayer oxidation that occurs in the double layer region of the electrodeposited gold. In particular, in alkaline solution, where gold usually shows the most electrocatalytic activity, these active surface states may be overoxidized and inhibit the electrocatalytic reaction. However, the activity and morphology of an electrodeposited film can be tailored whereby electrodeposited gold that exhibits nanostructure within the crystallites on the surface demonstrated enhanced electrocatalytic activity compared to smaller smooth gold crystallites and larger dendritic structures in potential regions well within the double layer region.
Electrocatalytic and SERS activity of Pt rich Pt-Pb nanostructures formed via the utilisation of in-situ underpotential deposition of lead
Publisher: Springer Science and Business Media LLC
Date: 05-09-2014
An investigation of silver electrodeposition from ionic liquids: Influence of atmospheric water uptake on the silver electrodeposition mechanism and film morphology
Publisher: Elsevier BV
Date: 02-2011
Low Temperature Nano Mechano-electrocatalytic CH4 Conversion
Publisher: American Chemical Society (ACS)
Date: 26-04-2022
Abstract: Transforming natural resources to energy sources, such as converting CH
A simple approach to improve the electrocatalytic properties of commercial Pt/C
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC03834K
Abstract: Decoration of commercial Pt/C with Au via a simple solution process to improve electrocatalytic ethanol oxidation.
Sonochemical Synthesis of Ga/ZnO Nanomaterials from a Liquid Metal for Photocatalytic Applications
Publisher: Wiley
Date: 16-11-2021
Abstract: The effective degradation of synthetic dyes via photocatalysis using abundant cheap materials is an ongoing challenge. Often photocatalysts are costly and employ complex fabrication processes that give limited efficiency which therefore inhibits widespread industrial proliferation. To address this issue, a simple room temperature alloying process followed by sonication for the preparation of photocatalytically active GaZnO nanosheets confined on a metallic GaZn core is reported. The material is characterized with X‐ray diffraction, X‐ray photoelectron spectroscopy, inductively coupled plasma optical emission spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and electrochemical techniques. These analyses confirm the presence of a metallic GaZn core decorated with GaZnO nanosheets. The resultant GaZn/GaZnO catalyst exhibits excellent photocatalytic activity for the degradation of methyl orange. A high degradation efficiency of 73% is achieved under solar simulated conditions which is attributed to the GaZn core acting as an electron sink allowing for effective charge carrier separation at the surface confined GaZnO sheets and the production of reactive oxygen species.
Hybrid Antibacterial Fabrics with Extremely High Aspect Ratio Ag/AgTCNQ Nanowires
Publisher: Wiley
Date: 10-2013
LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions
Publisher: Wiley
Date: 05-06-2019
Lightweight ITO Electrodes Decorated with Gold Nanostructures for Electrochemical Applications
Publisher: Wiley
Date: 24-06-2019
Abstract: Gold nanostructures were fabricated on a transparent indium tin oxide (ITO) coated PET substrate by an electrodeposition technique from a potassium gold (III) chloride solution for two different types of applications. It was found that the optical transparency of lightweight ITO electrodes could be maintained by depositing isolated gold nanostructures while opening up the use of these electrodes for inner sphere electron reactions, such as hydroquinone oxidation, which are not possible at ITO electrodes. For practical applications the adhesion of gold to the ITO electrode was improved by modifying the ITO surface with 3‐mercaptopropyl‐trimethoxysilane (MPS). Compared to Au/ITO, the Au/MPS/ITO electrode showed vastly improved electrochemical activity toward various electron transfer reactions when subjected to mechanical stress. The biosensing properties of the Au/MPS/ITO electrode was also investigated by studying the detection of immobilized DNA on the Au/MPS/ITO electrode via electrochemical impedance spectroscopy (EIS).
Liquid metal assisted sonocatalytic degradation of organic azo dyes to solid carbon particles
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CC03235F
Abstract: Room temperature liquid metals based on gallium can be used as a sonochemical catalyst to degrade organic azo dyes into harmless carbon particles with different sizes. The liquid metal is recoverable after each cycle and therefore reuseable.
Probing Second Harmonic Components of pH-Sensitive Redox Processes in a Mesoporous TiO2-Nafion Film Electrode with Fourier-Transformed Large-Amplitude Sinusoidally Modulated Voltammetry
Publisher: Wiley
Date: 2009
Ionic imbalance induced self-propulsion of liquid metals
Publisher: Springer Science and Business Media LLC
Date: 04-08-2016
DOI: 10.1038/NCOMMS12402
Abstract: Components with self-propelling abilities are important building blocks of small autonomous systems and the characteristics of liquid metals are capable of fulfilling self-propulsion criteria. To date, there has been no exploration regarding the effect of electrolyte ionic content surrounding a liquid metal for symmetry breaking that generates motion. Here we show the controlled actuation of liquid metal droplets using only the ionic properties of the aqueous electrolyte. We demonstrate that pH or ionic concentration gradients across a liquid metal droplet induce both deformation and surface Marangoni flow. We show that the Lippmann dominated deformation results in maximum velocity for the self-propulsion of liquid metal droplets and illustrate several key applications, which take advantage of such electrolyte-induced motion. With this finding, it is possible to conceive the propulsion of small entities that are constructed and controlled entirely with fluids, progressing towards more advanced soft systems.
Electrochemically-Induced TCNQ/Mn[TCNQ]2(H2O)2 (TCNQ = 7,7,8,8-Tetracyanoquinodimethane) Solid−Solid Interconversion: Two Voltammetrically Distinct Processes That Allo
Publisher: American Chemical Society (ACS)
Date: 11-09-2009
DOI: 10.1021/IC9011394
Abstract: Unlike the case with other alent transition metal M[TCNQ](2)(H(2)O)(2) (M = Fe, Co, Ni) analogues, the electrochemically induced solid-solid phase interconversion of TCNQ microcrystals (TCNQ = 7,7,8,8-tetracyanoquinodimethane) to Mn[TCNQ](2)(H(2)O)(2) occurs via two voltammetrically distinct, time dependent processes that generate the coordination polymer in nanofiber or rod-like morphologies. Careful manipulation of the voltammetric scan rate, electrolysis time, Mn(2+)((aq)) concentration, and the method of electrode modification with solid TCNQ allows selective generation of either morphology. Detailed ex situ spectroscopic (IR, Raman), scanning electron microscopy (SEM), and X-ray powder diffraction (XRD) characterization clearly establish that differences in the electrochemically synthesized Mn-TCNQ material are confined to morphology. Generation of the nanofiber form is proposed to take place rapidly via formation and reduction of a Mn-stabilized anionic dimer intermediate, [(Mn(2+))(TCNQ-TCNQ)(2)(*-)], formed as a result of radical-substrate coupling between TCNQ(*-) and neutral TCNQ, accompanied by ingress of Mn(2+) ions from the aqueous solution at the triple phase TCNQ/electrode/electrolyte boundary. In contrast, formation of the nanorod form is much slower and is postulated to arise from disproportionation of the [(Mn(2+))(TCNQ-TCNQ)(*-)(2)] intermediate. Thus, identification of the time dependent pathways via the solid-solid state electrochemical approach allows the crystal size of the Mn[TCNQ](2)(H(2)O)(2) material to be tuned and provides new mechanistic insights into the formation of different morphologies.
Galvanic Replacement of the Liquid Metal Galinstan
Publisher: American Chemical Society (ACS)
Date: 26-09-2016
DOI: 10.1021/JACS.6B05957
Abstract: The galvanic replacement reaction is a highly versatile approach for the creation of a variety of nanostructured materials. However, the majority of reports are limited to the replacement of metallic nanoparticles or metal surfaces. Here we extend this elegant approach and describe the galvanic replacement of the liquid metal alloy galinstan with Ag and Au. This is achieved at a macrosized droplet to create a liquid metal marble that comprises a liquid metal core and a solid metal shell, whereby the morphology of the outer shell is determined by the concentration of metallic ions used in the solution during the galvanic replacement process. In principle, this allows one to recover precious metal ions from solution in their metallic form, which are immobilized on the liquid metal and therefore easy to recover. The reaction is also undertaken at liquid metal microdroplets created via sonication to produce Ag- and Au-based galinstan nanorice particles. These materials are characterized with SEM, XRD, TEM, SAED, EDX, XPS, UV-visible spectroscopy, and open-circuit potential versus time experiments to understand the galvanic replacement process. Finally, the nanosized materials are investigated for their catalytic activity toward the reduction of methylene blue in the presence of sodium borohydride. This approach illustrates a new avenue of research for the galvanic replacement process and, in principle, could be applied to many more systems.
Green Synthesis of Low-Dimensional Aluminum Oxide Hydroxide and Oxide Using Liquid Metal Reaction Media: Ultrahigh Flux Membranes
Publisher: Wiley
Date: 21-09-2018
Utilizing a Photocatalysis Process to Achieve a Cathode with Low Charging Overpotential and High Cycling Durability for a Li‐O2 Battery
Publisher: Wiley
Date: 11-09-2020
Fabrication of dual function disposable substrates for spectroelectrochemical nanosensing
Publisher: Elsevier BV
Date: 05-2019
Fabrication and performance of electrochemically grafted thiophene silicon nanoparticle anodes for Li-ion batteries
Publisher: Elsevier BV
Date: 08-2016
Reusable surface confined semi-conducting metal-TCNQ and metal-TCNQF4 catalysts for electron transfer reactions
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA22936J
The Role of Electrocatalysis in a Sustainable Future: From Renewable Energy Conversion and Storage to Emerging Reactions
Publisher: Wiley
Date: 18-11-2019
Galvanic replacement mediated transformation of Ag nanospheres into dendritic Au–Ag nanostructures in the ionic liquid [BMIM][BF4]
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B918866E
Abstract: We demonstrate an unusual shape transformation of Ag nanospheres into {111}-oriented Au-Ag dendritic nanostructures by a galvanic replacement reaction in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF(4)]).
Development of an interfacial osmosis diffusion method to prepare imine-based covalent organic polymer electrocatalysts for the oxygen evolution reaction
Publisher: Elsevier BV
Date: 12-2020
Electrochemical tailoring of fibrous polyaniline and electroless decoration with gold and platinum nanoparticles
Publisher: American Chemical Society (ACS)
Date: 25-08-2016
DOI: 10.1021/ACS.LANGMUIR.6B02058
Abstract: Presented in this work is a facile and quick electrochemical method for controlling the morphology of thick polyaniline (PANi) films, without the use of templates. By stepping the polymerization potential from high voltages to a lower (or series of lower) voltage(s), we successfully controlled the morphology of the polymer, and fibrous structures, unique to each potential step, were achieved. In addition, the resultant film was tested electrochemically for its viability as an electrode material for flexible batteries and supercapacitors. Furthermore, the PANi film was decorated with gold and platinum nanoparticles via an electroless deposition process for possible electrocatalytic applications, whereby the oxidation of hydrazine at the composite was investigated.
Honeycomb nanogold networks with highly active sites
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CC03696J
Abstract: The formation of macroporous honeycomb gold using an electrochemically generated hydrogen bubble template is described. The synthesis procedure induces the formation of highly active surfaces with enhanced electrocatalytic and surface enhanced Raman scattering properties.
Galvanic Replacement of Liquid Metal Galinstan with Copper for the Synthesis of Core-Shell Cuga-Cu2o Nanomaterials
Publisher: The Electrochemical Society
Date: 09-2019
DOI: 10.1149/MA2019-02/41/1980
Abstract: Anthropogenic carbon dioxide (CO 2 ), resulting from the world’s persistent reliance on fossil fuels as the principal source of energy, has perturbed and induced an imbalance in the natural carbon-cycle. This increased CO 2 emission into the environment has been implicated in global warming and other environmental issues 1 . Therefore, coupling a sustainable energy system with carbon dioxide reduction to produce valuable chemical compounds is being thoroughly investigated 1 . Among the techniques developed for selective CO 2 conversion, electrochemical CO 2 reduction is regarded as one of the most appealing due to mild operating conditions and use of renewable energy to power the process. Theoretically, electrochemical CO 2 reduction largely depends on the adsorption energies of intermediate species, therefore, metal-based catalysts (Pt, Au, Pd, Ag, Sn, Cu, In, and etc.) are commonly employed which can influence the overall system selectivity. In particular, Cu-based catalysts have shown reasonable activity and potential for selectivity for this reaction owing to moderate adsorption energy for intermediate species on Cu. In addition, Cu is one of the few inexpensive metals that can catalytically convert CO 2 to a variety of useful chemicals under environmental conditions (room temperature and atmospheric pressure) via a multi-electron transfer process. Although Cu catalysts show interesting CO 2 reduction properties, they still suffer from selectivity issues to generate a desired single product at scale 2 . A recent development is in the area of room temperature liquid metals where the catalytic activity of liquid metal Galinstan has begun to be explored 3 . Although in its infancy, we hypothesized that a multi-metallic electrocatalyst of galinstan (GaInSn) and Cu could be active for electrocatalytic and photocatalytic reactions such as CO 2 reduction and dye degradation considering that Ga alloys with most metals and should therefore influence the electronic properties of Cu. Previous work has shown that the catalytic activity of multi-metallic electrocatalysts is superior to their mono and bimetallic electrocatalysts counterparts 4 . Hence, multi-metallic electrocatalysts exhibit different electronic structures, crystallinity as a result of the interplay of geometric, ligand and electronic effects 5 . To date, no report is available in the open literature reporting the alloying of liquid metal GaInSn and Cu via galvanic replacement. Herein, we report the simple synthesis of a multi-metallic nanostructure comprising of a CuGa core with trace In and Sn and a surface layer of Cu 2 O and Ga 2 O 3 . The material was characterized using Scanning Electron Microscopy (SEM), Grazing Incidence X-ray Diffraction (GIXRD), X-ray Photoelectron Spectroscopy (XPS), Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES) and Transmission Electron Microscopy (TEM). The SAED and TEM images indicate that the core alloy is polycrystalline with well-defined lattice fringes with the presence of crystalline Cu 2 O and an amorphous region (resulting from gallium oxide). The presence of surface semiconducting oxides with an underlying metal core should in principle be an appropriate system for separating charge carriers under photoexcitation thereby facilitating organic molecule degradation studies. The multi-metallic nanostructure was therefore engineered towards electrochemical CO 2 reduction and photocatalytic pollutant degradation. The preliminary investigation on the photocatalytic activity of this material using Toluidine Blue (TB) under visible light irradiation indicates excellent photocatalytic activity. References N. S. Lewis and D. G. Nocera, Proceedings of the National Academy of Sciences of the United States of America , 2006, 103 , 15729-15735. H. Xie, T. Wang, J. Liang, Q. Li and S. Sun, Nano Today , 2018, 21 , 41-54. F. Hoshyargar, H. Khan, K. Kalantar-zadeh and A. P. O'Mullane, Chemical Communications , 2015, 51 , 14026-14029. E. A. Redekop, V. V. Galvita, H. Poelman, V. Bliznuk, C. Detavernier and G. B. Marin, ACS Catalysis , 2014, 4 , 1812-1824. X. L. Tian, L. Wang, P. Deng, Y. Chen and B. Y. Xia, Journal of Energy Chemistry , 2017, 26 , 1067-1076. Figure 1
Influence of semiconducting properties of nanoparticle coating on the electrochemical actuation of liquid metal marble
Publisher: AIP Publishing
Date: 22-09-2014
DOI: 10.1063/1.4896629
Abstract: Semiconducting properties of nanoparticle coating on liquid metal marbles can present opportunities for an additional dimension of control on these soft objects with functional surfaces in aqueous environments. We show the unique differences in the electrochemical actuation mechanisms of liquid metal marbles with n- and p-type semiconducting nanomaterial coating. A systematic study on such liquid metal marbles shows voltage dependent nanoparticle cluster formation and morphological changes of the liquid metal core during electrochemical actuations and these observations are unique to p-type nanomaterial coated liquid metal marbles.
Self-Limiting Galvanic Growth of MnO2 Monolayers on a Liquid Metal—Applied to Photocatalysis
Publisher: Wiley
Date: 04-07-2019
Impact of fuel cells on hydrogen energy pathways in a sustainable energy economy
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2SE00923D
Abstract: Key performance characteristics of Proton Exchange Membrane (PEMFC) and Solid Oxide Fuel Cell (SOFC) are compared with emphasis on the sustainability of energy pathways showing that hydrogen for use in PEMFC is best supplied from renewable hydrogen.
Naphthalene flanked diketopyrrolopyrrole: a new conjugated building block with hexyl or octyl alkyl side chains for electropolymerization studies and its biosensor applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9PY00430K
Abstract: Naphthalene flanked DPP with hexyl and octyl chain based electropolymerized conjugated polymers exhibits bio-sensing.
Harnessing Native Iron Ore as an Efficient Electrocatalyst for Overall Water Splitting
Publisher: Wiley
Date: 15-07-2019
Transformation of stainless steel 316 into a bifunctional water splitting electrocatalyst tolerant to polarity switching
Publisher: Elsevier BV
Date: 09-2020
High performance electrochromic devices based on anodized nanoporous Nb2 O5
Publisher: American Chemical Society (ACS)
Date: 18-12-2014
DOI: 10.1021/JP410097Y
Tetrathiafulvalene–7,7,8,8‐Tetracyanoquinodimethane and Tetrathiafulvalene–2,3,5,6‐Tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane Organic Charge‐Transfer Complexes: Reusable Catalysts for Electron‐Trans
Publisher: Wiley
Date: 15-06-2016
Electropolymerisation of catalytically active PEDOT from an ionic liquid on a flexible carbon cloth using a sandwich cell configuration
Publisher: Wiley
Date: 04-11-2015
Abstract: The electropolymerisation of poly(3,4‐ethylenedioxythiopene) (PEDOT) from an ionic liquid, butyl‐methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (C 4 mpyrTFSI), onto flexible carbon cloth electrodes is reported. A continuous, homogeneous and well‐adhered coating of the in idual cloth fibres is achieved by employing a sandwich cell arrangement in which the carbon cloth, which is soaked with electrolyte, is placed between two indium tin oxide electrodes isolated from each other by a battery separator. The resultant PEDOT‐modified carbon cloth electrode demonstrates excellent activity for the oxygen reduction reaction, which results from the doping level, conductivity and morphology of the PEDOT layer, and is also tolerant to the presence of methanol in the electrolyte. This simple approach therefore offers a route to fabricate flexible polymer electrodes that could be used in various electronic applications.
Emergence of Liquid Metals in Nanotechnology
Publisher: American Chemical Society (ACS)
Date: 27-06-2019
Abstract: Bulk liquid metals have prospective applications as soft and fluid electrical and thermal conductors in electronic and optical devices, composites, microfluidics, robotics, and metallurgy with unique opportunities for processing, chemistry, and function. Yet liquid metals' great potential in nanotechnology remains in its infancy. Although work to date focuses primarily on Ga, Hg, and their alloys, to expand the field, we define "liquid metals" as metals and alloys with melting points (mp) up to 330 °C, readily accessible and processable even using household kitchen appliances. Such a definition encompasses a family of metals-including the majority of post-transition metals and Zn group elements (excluding Zn itself)-with remarkable versatility in chemistry, physics, and engineering. These liquid alloys can create metallic compounds of different morphologies, compositions, and properties, thereby enabling control over nanoscale phenomena. In addition, the presence of electronic and ionic "pools" within the bulk of liquid metals, as well as deviation from classical metallurgy on the surfaces of liquid metals, provides opportunities for gaining new capabilities in nanotechnology. For ex le, the bulk and surfaces of liquid metals can be used as reaction media for creating and manipulating nanomaterials, promoting reactions, or controlling crystallization of dissolved species. Interestingly, liquid metals have enormous surface tensions, yet the tension can be tuned electrically over a wide range or modified
Utilising solution dispersed platinum nanoparticles to direct the growth of electrodeposited platinum nanostructures and its influence on the electrocatalytic oxidation of small organic molecules
Publisher: Elsevier BV
Date: 10-2016
Gold nanospikes based microsensor as a highly accurate mercury emission monitoring system
Publisher: Springer Science and Business Media LLC
Date: 23-10-2014
DOI: 10.1038/SREP06741
Electrochemical Restructuring of Copper Surfaces Using Organic Additives and Its Effect on the Electrocatalytic Reduction of Nitrate Ions
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/CH15191
Abstract: This work describes the fabrication of nanostructured copper electrodes using a simple potential cycling protocol that involves oxidation and reduction of the surface in an alkaline solution. It was found that the inclusion of additives, such as benzyl alcohol and phenylacetic acid, has a profound effect on the surface oxidation process and the subsequent reduction of these oxides. This results in not only a morphology change, but also affects the electrocatalytic performance of the electrode for the reduction of nitrate ions. In all cases, the electrocatalytic performance of the restructured electrodes was significantly enhanced compared with the unmodified electrode. The most promising material was formed when phenylacetic acid was used as the additive. In addition, the reduction of residual oxides on the surface after the modification procedure to expose freshly active reaction sites on the surface before nitrate reduction was found to be a significant factor in dictating the overall electrocatalytic activity. It is envisaged that this approach offers an interesting way to fabricate other nanostructured electrode surfaces.
Aqueous phase synthesis of copper nanoparticles: a link between heavy metal resistance and nanoparticle synthesis ability in bacterial systems
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2NR32887A
Abstract: We demonstrate aqueous phase biosynthesis of phase-pure metallic copper nanoparticles (CuNPs) using a silver resistant bacterium Morganella morganii. This is particularly important considering that there has been no report that demonstrates biosynthesis and stabilization of pure copper nanoparticles in the aqueous phase. Electrochemical analysis of bacterial cells exposed to Cu(2+) ions provides new insights into the mechanistic aspect of Cu(2+) ion reduction within the bacterial cell and indicates a strong link between the silver and copper resistance machinery of bacteria in the context of metal ion reduction. The outcomes of this study take us a step closer towards designing rational strategies for biosynthesis of different metal nanoparticles using microorganisms.
Electrodeposition at Highly Negative Potentials of an Iron‐Cobalt Oxide Catalyst for Use in Electrochemical Water Splitting
Publisher: Wiley
Date: 18-07-2019
Abstract: Earth‐abundant transition metal‐based catalysts have been extensively investigated for their applicability in water electrolysers to enable overall water splitting to produce clean hydrogen and oxygen. In this study a Fe−Co based catalyst is electrodeposited in 30 seconds under vigorous hydrogen evolution conditions to produce a high surface area material that is active for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). This catalyst can achieve high current densities of 600 mAcm −2 at an applied potential of 1.6 V (vs RHE) in 1 M NaOH with a Tafel slope value of 48 mV dec −1 for the OER. In addition, the HER can be facilitated at current densities as high as 400 mA cm −2 due to the large surface area of the material. The materials were found to be predominantly amorphous but did contain crystalline regions of CoFe 2 O 4 which became more evident after the OER indicating interesting compositional and structural changes that occur to the catalyst after an electrocatalytic reaction. This rapid method of creating a bimetallic oxide electrode for both the HER and OER could possibly be adopted to other bimetallic oxide systems suitable for electrochemical water splitting.
Higher Harmonic Large-Amplitude Fourier Transformed Alternating Current Voltammetry: Analytical Attributes Derived from Studies of the Oxidation of Ferrocenemethanol and Uric Acid at a Glassy Carbon E
Publisher: American Chemical Society (ACS)
Date: 17-05-2008
DOI: 10.1021/AC0715221
Abstract: An analytical evaluation of the higher ac harmonic components derived from large litude Fourier transformed voltammetry is provided for the reversible oxidation of ferrocenemethanol (FcMeOH) and oxidation of uric acid by an EEC mechanism in a pH 7.4 phosphate buffer at a glassy carbon (GC) electrode. The small background current in the analytically optimal fifth harmonic is predominantly attributed to faradaic current associated with the presence of electroactive functional groups on the GC electrode surface, rather than to capacitive current which dominates the background in the dc, and the initial three ac harmonics. The detection limits for the dc and the first to fifth harmonic ac components are 1.9, 5.89, 2.1, 2.5, 0.8, and 0.5 microM for FcMeOH, respectively, using a sine wave modulation of 100 mV at 21.46 Hz and a dc sweep rate of 111.76 mV s (-1). Analytical performance then progressively deteriorates in the sixth and higher harmonics. For the determination of uric acid, the capacitive background current was enhanced and the reproducibility lowered by the presence of surface active uric acid, but the rapid overall 2e (-) rather than 1e (-) electron transfer process gives rise to a significantly enhanced fifth harmonic faradaic current which enabled a detection limit of 0.3 microM to be achieved which is similar to that reported using chemically modified electrodes. Resolution of overlapping voltammetric signals for a mixture of uric acid and dopamine is also achieved using higher fourth or fifth harmonic components, under very low background current conditions. The use of higher fourth and fifth harmonics exhibiting highly favorable faradaic to background (noise) current ratios should therefore be considered in analytical applications under circumstances where the electron transfer rate is fast.
Catalytic Metal Foam by Chemical Melting and Sintering of Liquid Metal Nanoparticles
Publisher: Wiley
Date: 25-11-2020
Characterisation of two distinctly different processes associated with the electrocrystallization of microcrystals of phase I CuTCNQ (TCNQ = 7,7,8,8-tetracyanoquinodimethane)
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B607290A
Reduction of Au3+ ions by activated surface atoms of platinum
Publisher: Elsevier BV
Date: 08-2011
Gonorrhoea gone wild: rising incidence of gonorrhoea and associated risk factors among gay and bisexual men attending Australian sexual health clinics
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/SH18097
Abstract: Background Gonorrhoea notifications continue to rise among gay and bisexual men in Australia and around the world. More information is needed on infection trends, accounting for testing and complimented by demographics and risk practices. Methods: A retrospective cohort analysis was undertaken using repeat gonorrhoea testing data among gay and bisexual men from 2010 to 2017, which was extracted from a network of 47 sexual health clinics across Australia. Poisson and Cox regression analyses were used to determine temporal trends in gonorrhoea incidence rates, as well as associated demographic and behavioural factors. Results: The present analysis included 46904 gay and bisexual men. Gonorrhoea incidence at any anatomical site increased from 14.1/100 person years (PY) in 2010 to 24.6/100 PY in 2017 (P& .001), with the greatest increase in infections of the pharynx (5.6-15.9/100 PY, P& .001) and rectum (6.6–14.8/100 PY, P& .001). After adjusting for symptomatic and contact-driven presentations, the strongest predictors of infection were having more than 20 sexual partners in a year (hazard ratio (HR)=1.9, 95% confidence interval (CI): 1.7–2.2), using injecting drugs (HR=1.7, 95%CI: 1.4–2.0), being HIV positive (HR=1.4, 95%CI: 1.2–1.6) and being aged less than 30 years old (HR=1.4, 95%CI: 1.2–1.6). Conclusions: Gonorrhoea has increased dramatically among gay and bisexual men in Australia. Enhanced prevention efforts, as well as more detailed, network-driven research are required to combat gonorrhoea among young men, those with HIV and those who use injecting drugs.
Investigation of Mediated Oxidation of Ascorbic Acid by Ferrocenemethanol Using Large-Amplitude Fourier Transformed ac Voltammetry under Quasi-Reversible Electron-Transfer Conditions at an Indium Tin
Publisher: American Chemical Society (ACS)
Date: 31-07-2008
DOI: 10.1021/AC702531F
Abstract: The ability of the technique of large- litude Fourier transformed (FT) ac voltammetry to facilitate the quantitative evaluation of electrode processes involving electron transfer and catalytically coupled chemical reactions has been evaluated. Predictions derived on the basis of detailed simulations imply that the rate of electron transfer is crucial, as confirmed by studies on the ferrocenemethanol (FcMeOH)-mediated electrocatalytic oxidation of ascorbic acid. Thus, at glassy carbon, gold, and boron-doped diamond electrodes, the introduction of the coupled electrocatalytic reaction, while producing significantly enhanced dc currents, does not affect the ac harmonics. This outcome is as expected if the FcMeOH (0/+) process remains fully reversible in the presence of ascorbic acid. In contrast, the ac harmonic components available from FT-ac voltammetry are predicted to be highly sensitive to the homogeneous kinetics when an electrocatalytic reaction is coupled to a quasi-reversible electron-transfer process. The required quasi-reversible scenario is available at an indium tin oxide electrode. Consequently, reversible potential, heterogeneous charge-transfer rate constant, and charge-transfer coefficient values of 0.19 V vs Ag/AgCl, 0.006 cm s (-1) and 0.55, respectively, along with a second-order homogeneous chemical rate constant of 2500 M (-1) s (-1) for the rate-determining step in the catalytic reaction were determined by comparison of simulated responses and experimental voltammograms derived from the dc and first to fourth ac harmonic components generated at an indium tin oxide electrode. The theoretical concepts derived for large- litude FT ac voltammetry are believed to be applicable to a wide range of important solution-based mediated electrocatalytic reactions.
Investigation of the physical origins of etching LiNbO3 during Ti in-diffusion
Publisher: AIP Publishing
Date: 22-03-2010
DOI: 10.1063/1.3367742
Abstract: We investigate the physical origins of etching observed during Ti diffusion. The relationship between observed etch depth and water vapor content in the annealing environment is quantified. The dynamics of the etching process are also identified. It is discovered that water vapor content is essential for etching and that there is a characteristic delay before etching is observed. From these observations we can conclude that the process is electrochemical in nature with ionic defects diffusing into the Ti strip from the lithium niobate and these defects catalyzing the dissociation of water into reactive ions.
Superhydrophobic Graphene-Like Nanocarbon Film Formation on Arbitrary Surfaces through MgO Nanoparticle Catalysis: Advanced Coatings for Energy Storage and Nanocomposites
Publisher: American Chemical Society (ACS)
Date: 14-09-2023
Cathodic Corrosion of Cu Substrates as a Route to Nanostructured Cu/M (M=Ag, Au, Pd) Surfaces
Publisher: Wiley
Date: 12-09-2014
Preparation of Metal−TCNQ Charge-Transfer Complexes on Conducting and Insulating Surfaces by Photocrystallization
Publisher: American Chemical Society (ACS)
Date: 27-01-2007
DOI: 10.1021/JA066874O
Abstract: A generic method for the synthesis of metal-7,7,8,8-tetracyanoquinodimethane (TCNQ) charge-transfer complexes on both conducting and nonconducting substrates is achieved by photoexcitation of TCNQ in acetonitrile in the presence of a sacrificial electron donor and the relevant metal cation. The photochemical reaction leads to reduction of TCNQ to the TCNQ(-) monoanion. In the presence of M(x+)(MeCN), reaction with TCNQ(-)(MeCN) leads to deposition of M(x+)[TCNQ]x crystals onto a solid substrate with morphologies that are dependent on the metal cation. Thus, CuTCNQ phase I photocrystallizes as uniform microrods, KTCNQ as microrods with a random size distribution, AgTCNQ as very long nanowires up to 30 mum in length and with diameters of less than 180 nm, and Co[TCNQ](2)(H(2)O)(2) as nanorods and wires. The described charge-transfer complexes have been characterized by optical and scanning electron microscopy and IR and Raman spectroscopy. The CuTCNQ and AgTCNQ complexes are of particular interest for use in memory storage and switching devices. In principle, this simple technique can be employed to generate all classes of metal-TCNQ complexes and opens up the possibility to pattern them in a controlled manner on any type of substrate.
Monitoring Cuprous Ion Transport by Scanning Electrochemical Microscopy during the Course of Copper Electrodeposition
Publisher: The Electrochemical Society
Date: 2008
DOI: 10.1149/1.2936177
Liquid Metal-Based Route for Synthesizing and Tuning Gas-Sensing Elements
Publisher: American Chemical Society (ACS)
Date: 30-03-2020
Comparison of nanostructures obtained from galvanic replacement in water and an ionic liquid for applications in electrocatalysis and SERS
Publisher: Elsevier BV
Date: 11-2012
Directing Nanostructure Formation of Gold through the In Situ Underpotential Deposition of a Secondary Metal for the Detection of Nitrite Ions
Publisher: Wiley
Date: 06-09-2017
Nanoconfined Synthesis of Nitrogen-Rich Metal-Free Mesoporous Carbon Nitride Electrocatalyst for the Oxygen Evolution Reaction
Publisher: American Chemical Society (ACS)
Date: 09-01-2020
Atmospheric-pressure plasma seawater desalination: Clean energy, agriculture, and resource recovery nexus for a blue planet
Publisher: Elsevier BV
Date: 09-2020
Voltammetric, Spectroscopic, and Microscopic Investigations of Electrocrystallized Forms of Semiconducting AgTCNQ (TCNQ = 7,7,8,8-Tetracyanoquinodimethane) Exhibiting Different Morphologies and Colors
Publisher: American Chemical Society (ACS)
Date: 23-10-2007
DOI: 10.1021/CM070780B
Monitoring compositional changes in Ni(OH)2electrocatalysts employed in the oxygen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9AN01905G
Abstract: Relating morphology and compositional changes spatially across a catalyst is important for understanding the active site involved in a reaction which is studied here for the OER at Ni(OH) 2 .
Comparative Analysis of Wind Power Energy Potential at Two Coastal Locations in Bangladesh
Publisher: Springer Science and Business Media LLC
Date: 30-12-2015
Study of the Underlying Electrochemistry of Polycrystalline Gold Electrodes in Aqueous Solution and Electrocatalysis by Large Amplitude Fourier Transformed Alternating Current Voltammetry
Publisher: American Chemical Society (ACS)
Date: 12-02-2008
DOI: 10.1021/LA702454K
Abstract: Polycrystalline gold electrodes of the kind that are routinely used in analysis and catalysis in aqueous media are often regarded as exhibiting relatively simple double-layer charging/discharging and monolayer oxide formation/removal in the positive potential region. Application of the large litude Fourier transformed alternating current (FT-ac) voltammetric technique that allows the faradaic current contribution of fast electron-transfer processes to be emphasized in the higher harmonic components has revealed the presence of well-defined faradaic (premonolayer oxidation) processes at positive potentials in the double-layer region in acidic and basic media which are enhanced by electrochemical activation. These underlying quasi-reversible interfacial electron-transfer processes may mediate the course of electrocatalytic oxidation reactions of hydrazine, ethylene glycol, and glucose on gold electrodes in aqueous media. The observed responses support key assumptions associated with the incipient hydrous oxide adatom mediator (IHOAM) model of electrocatalysis.
Rapid Synthesis of Porous Honeycomb Cu/Pd through a Hydrogen‐Bubble Templating Method
Publisher: Wiley
Date: 18-07-2011
Abstract: A rapid electrochemical method based on using a clean hydrogen-bubble template to form a bimetallic porous honeycomb Cu/Pd structure has been investigated. The addition of palladium salt to a copper-plating bath under conditions of vigorous hydrogen evolution was found to influence the pore size and bulk concentration of copper and palladium in the honeycomb bimetallic structure. The surface was characterised by X-ray photoelectron spectroscopy, which revealed that the surface of honeycomb Cu/Pd was found to be rich with a Cu/Pd alloy. The inclusion of palladium in the bimetallic structure not only influenced the pore size, but also modified the dendritic nature of the internal wall structure of the parent copper material into small nanometre-sized crystallites. The chemical composition of the bimetallic structure and substantial morphology changes were found to significantly influence the surface-enhanced Raman spectroscopic response for immobilised rhodamine B and the hydrogen-evolution reaction. The ability to create free-standing films of this honeycomb material may also have many advantages in the areas of gas- and liquid-phase heterogeneous catalysis.
Enhanced coloration efficiency for electrochromic devices based on anodized Nb2 O5 /electrodeposited MoO3 binary systems
Publisher: American Chemical Society (ACS)
Date: 08-05-2014
DOI: 10.1021/JP5017888
Lateral charge propagation effects during the galvanic replacement of electrodeposited MTCNQ (M=Cu, Ag) microstructures with gold and its influence on catalyzed electron transfer reactions
Publisher: Elsevier BV
Date: 12-2013
Direct electrochemical formation of nanostructured amorphous Co(OH)2on gold electrodes with enhanced activity for the oxygen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TA09125J
Abstract: The rapid and direct electrochemical formation of amorphous nanostructured Co(OH) 2 on gold electrodes under room temperature conditions was found to be a highly active, yet stable, precursor for the OER.
Effect of the mediator in feedback mode-based SECM interrogation of indium tin-oxide and boron-doped diamond electrodes
Publisher: Springer Science and Business Media LLC
Date: 20-07-2006
Galvanic Replacement of Electrochemically Restructured Copper Electrodes with Gold and Its Electrocatalytic Activity for Nitrate Ion Reduction
Publisher: MDPI AG
Date: 25-09-2018
DOI: 10.3390/NANO8100756
Abstract: The electrochemical formation of nanostructured materials is a cost effective route to creating substrates that can be employed in a variety of applications. In this work the surface of a copper electrode was electrochemically restructured in an alkaline solution containing ethanol as an additive to modify the surface morphology, and generate a Cu/Cu2O surface, which is known to be active for the electrocatalytic reduction of environmentally harmful nitrate ions. To increase the activity of the nanostructured surface it was decorated with gold prisms through a facile galvanic replacement approach to create an active Cu/Cu2O/Au layer. The surface was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, as well as electrochemical techniques. It was found that the presence of recalcitrant oxides, and Au was beneficial for the increased activity compared to unmodified copper and undecorated restructured copper and was consistent with the incipient hydrous oxide adatom mediator model of electrocatalysis. This approach to generating nanostructured metal/metal oxide surfaces that can be galvanically replaced to create these types of composites may have other applications in the area of electrocatalysis.
Plasma Enabled Synthesis and Processing of Materials for Lithium-Ion Batteries
Publisher: Wiley
Date: 25-07-2018
Gold Doping in a Layered Co-Ni Hydroxide System via Galvanic Replacement for Overall Electrochemical Water Splitting
Publisher: Wiley
Date: 06-09-2018
Nanoparticle–electrode collisions as a dynamic seeding route for the growth of metallic nanostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CC09614B
Abstract: The collisions between colloidal metal nanoparticles and a carbon electrode were explored as a dynamic method for the electrodeposition of a erse range of electrocatalytically active Ag and Au nanostructures whose morphology is dominated by the electrostatic interaction between the charge of the nanoparticle and metal salt.
Probing the surface oxidation of chemically synthesised gold nanospheres and nanorods
Publisher: Springer Science and Business Media LLC
Date: 03-05-2014
Investigating Liquid Metal Galinstan as a High Current Carrier and Its Interaction with Collector Electrodes
Publisher: American Chemical Society (ACS)
Date: 11-08-2020
Repurposing metal containing wastes and mass-produced materials as electrocatalysts for water electrolysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2SE01068B
Abstract: Recycling metal containing waste is an attractive option to generate water splitting electrocatalysts for green hydrogen production. This will help alleviate future pressure on endangered elements that are required for the future energy transition.
Optical gas sensing properties of nanoporous Nb2 O5 films
Publisher: American Chemical Society (ACS)
Date: 20-02-2015
DOI: 10.1021/AM508463G
Abstract: Nanoporous Nb2O5 has been previously demonstrated to be a viable electrochromic material with strong intercalation characteristics. Despite showing such promising properties, its potential for optical gas sensing applications, which involves the production of ionic species such as H(+), has yet to be explored. Nanoporous Nb2O5 can accommodate a large amount of H(+) ions in a process that results in an energy bandgap change of the material which induces an optical response. Here, we demonstrate the optical hydrogen gas (H2) sensing capability of nanoporous anodic Nb2O5 with a large surface-to-volume ratio prepared via a high temperature anodization method. The large active surface area of the film provides enhanced pathways for efficient hydrogen adsorption and dissociation, which are facilitated by a thin layer of Pt catalyst. We show that the process of H2 sensing causes optical modulations that are investigated in terms of response magnitudes and dynamics. The optical modulations induced by the intercalation process and sensing properties of nanoporous anodic Nb2O5 shown in this work can potentially be used for future optical gas sensing systems.
Utilizing p-type native oxide on liquid metal microdroplets for low temperature gas sensing
Publisher: Elsevier BV
Date: 05-2017
Electrochemical detection of dopamine and cytochrome c at a nanostructured gold electrode
Publisher: Elsevier BV
Date: 12-2010
Electrochemical Capture and Storage of CO2 as Calcium Carbonate
Publisher: Wiley
Date: 17-02-2021
Synthesis of 2D cobalt oxide nanosheets using a room temperature liquid metal
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA06010K
Abstract: A RT liquid metal based on Ga can be used as a synthesis medium for creation of 2D nanosheets of cobalt oxide via expulsion of the sheets from the liquid metal surface into an acidic aqueous solution. The 2D nanosheets are shown to be active for OER.
Storing energy in plastics: A review on conducting polymers & their role in electrochemical energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA15947K
Abstract: This review article on conducting polymers discusses the background & theory behind their conductivity, the methods to nano-engineer special morphologies & recent contributions to the field of energy ( e.g. supercapacitors, batteries and fuel cells).
An SECM study on the influence of cationic, membrane-active peptides on a gold-supported self-assembled monolayer
Publisher: Elsevier BV
Date: 02-2015
Fabrication of Metal‐Nanoparticle‐Modified Semiconducting Copper– and Silver–TCNQ Materials as Substrates for the Reduction of Chromium(VI) Using Thiosulfate Ions at Ambient Temperature
Publisher: Wiley
Date: 13-09-2013
Abstract: The formation of readily recoverable and reusable organic semiconducting Cu- and AgTCNQ (TCNQ=7,7,8,8-tetracyanoquinodimethane) microstructures decorated with Pt and Pd metallic nanoparticles is described for the effective reduction of Cr
Electrochemically induced actuation of liquid metal marbles
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR00185G
Abstract: Controlled actuation of soft objects with functional surfaces in aqueous environments presents opportunities for liquid phase electronics, novel assembled super-structures and unusual mechanical properties. We show the extraordinary electrochemically induced actuation of liquid metal droplets coated with nanoparticles, so-called "liquid metal marbles". We demonstrate that nanoparticle coatings of these marbles offer an extra dimension for affecting the bipolar electrochemically induced actuation. The nanoparticles can readily migrate along the surface of liquid metals, upon the application of electric fields, altering the capacitive behaviour and surface tension in a highly asymmetric fashion. Surprising actuation behaviours are observed illustrating that nanoparticle coatings can have a strong effect on the movement of these marbles. This significant novel phenomenon, combined with unique properties of liquid metal marbles, represents an exciting platform for enabling erse applications that cannot be achieved using rigid metal beads.
Electropolymerisation of N-ethylanilinium trifluoroacetate ionic liquid into poly(N-ethylaniline) and control of its morphology
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/CH17258
Abstract: In this paper, the electropolymerisation of pre-synthesised N-ethylanilinium trifluoroacetate, a protic ionic liquid (PIL), was carried out. The PIL served as the monomer precursor, solvent, and supporting electrolyte for the polymerisation process, and no additional acid was required due to the protic nature of the PIL. Two different morphologies of the poly(N-ethylaniline) were achieved by using different electropolymerisation approaches and the resultant films were soluble in the PIL precursor as well as a wide range of organic solvents. The use of anilinium based PILs, as polymerisation precursors, promises a greener approach for the production of polyanilines, as well as highly processable polymers.
Probing the Ag – liquid gallium system and its interaction with redox active solutions for catalysis and AgTCNQ formation
Publisher: Elsevier BV
Date: 08-2021
Effect of Imidazolium-Based Ionic Liquids on the Nanoscale Morphology of CuTCNQ (TCNQ = 7,7,8,8-Tetracyanoquinodimethane) Metal–Organic Semiconductors
Publisher: American Chemical Society (ACS)
Date: 24-12-2012
DOI: 10.1021/LA303885R
Abstract: We demonstrate for the first time the ionic-liquid-mediated synthesis of nanostructured CuTCNQ by the simple immersion of copper in a solution of TCNQ where the viscosity of the medium significantly impacts the corrosion-crystallization process and the final morphology of the material.
Hexagonal Molybdenum Trioxide (h‐MoO3) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries
Publisher: Wiley
Date: 13-12-2019
Electrodeposited α- And β-phase MoO 3 films and investigation of their gasochromic properties
Publisher: American Chemical Society (ACS)
Date: 21-03-2012
DOI: 10.1021/CG201500B
Electrochemical fabrication of metallic nanostructured electrodes for electroanalytical applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1AN15657H
Abstract: The use of electrodeposited metal-based nanostructures for electroanalytical applications has recently received widespread attention. There are several approaches to creating nanostructured materials through electrochemical routes that include facile electrodeposition at either untreated or modified electrodes, or through the use of physical or chemical templating methods. This allows the shape, size and composition of the nanomaterial to be readily tuned for the application of interest. The use of such materials is particularly suited to electroanalytical applications. In this mini-review an overview of recently developed nanostructured materials developed through electrochemical routes is presented as well as their electroanalytical applications in areas of biological and environmental importance.
Shape dependent electrocatalytic behaviour of silver nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CE00215A
Fingerprinting Green Curry: An Electrochemical Approach to Food Quality Control
Publisher: American Chemical Society (ACS)
Date: 29-05-2018
DOI: 10.1021/ACSSENSORS.8B00176
Abstract: The detection and identification of multiple components in a complex s le such as food in a cost-effective way is an ongoing challenge. The development of on-site and rapid detection methods to ensure food quality and composition is of significant interest to the food industry. Here we report that an electrochemical method can be used with an unmodified glassy carbon electrode for the identification of the key ingredients found within Thai green curries. It was found that green curry presents a fingerprint electrochemical response that contains four distinct peaks when differential pulse voltammetry is performed. The reproducibility of the sensor is excellent as no surface modification is required and therefore storage is not an issue. By employing particle swarm optimization algorithms the identification of ingredients within a green curry could be obtained. In addition, the quality and freshness of the s le could be monitored by detecting a change in the intensity of the peaks in the fingerprint response.
A comparative study of electrochemical, optical properties and electropolymerization behavior of thiophene- and furan-substituted diketopyrrolopyrrole
Publisher: Springer Science and Business Media LLC
Date: 07-02-2017
DOI: 10.1557/JMR.2017.26
Mechanistic Details of the Membrane Perforation and Passive Translocation of TAT Peptides
Publisher: Wiley
Date: 30-10-2014
Abstract: The trans‐activator of transcription (TAT) peptide is regarded as the “gold standard” for cell‐penetrating peptides, capable of traversing a mammalian membrane passively into the cytosolic space. This characteristic has been exploited through conjugation of TAT for applications such as drug delivery. However, the process by which TAT achieves membrane penetration remains ambiguous and unresolved. Mechanistic details of TAT peptide action are revealed herein by using three complementary methods: quartz crystal microbalance with dissipation (QCM‐D), scanning electrochemical microscopy (SECM) and atomic force microscopy (AFM). When combined, these three scales of measurement define that the membrane uptake of the TAT peptide is by trans‐membrane insertion using a “worm‐hole” pore that leads to ion permeability across the membrane layer. AFM data provided nanometre‐scale visualisation of TAT punctuation using a mammalian‐mimetic membrane bilayer. The TAT peptide does not show the same specificity towards a bacterial mimetic membrane and QCM‐D and SECM showed that the TAT peptide demonstrates a disruptive action towards these membranes. This investigation supports the energy‐independent uptake of the cationic TAT peptide and provides empirical data that clarify the mechanism by which the TAT peptide achieves its membrane activity. The novel use of these three biophysical techniques provides valuable insight into the mechanism for TAT peptide translocation, which is essential for improvements in the cellular delivery of TAT‐conjugated cargoes including therapeutic agents required to target specific intracellular locations.
Molecular recognition and detection of Pb(II) ions in water by aminobenzo-18-crown-6 immobilised onto a nanostructured SERS substrate
Publisher: Elsevier BV
Date: 02-2018
Electrochemical degradation and mineralisation of organic dyes in aqueous nitrate solutions
Publisher: Elsevier BV
Date: 03-2023
Formation of polyaniline/Pt nanoparticle composite films and their electrocatalytic properties
Publisher: Springer Science and Business Media LLC
Date: 08-07-2006
Superactivation of metal electrode surfaces and its relevance to COads oxidation at fuel cell anodes
Publisher: Springer Science and Business Media LLC
Date: 2001
Room Temperature Electrochemical Synthesis of Crystalline GaOOH Nanoparticles from Expanding Liquid Metals
Publisher: American Chemical Society (ACS)
Date: 05-06-2018
DOI: 10.1021/ACS.LANGMUIR.8B00538
Abstract: Gallium oxyhydroxide (GaOOH) is a wide band gap semiconductor of interest for a variety of applications in electronics and catalysis where the synthesis of the crystalline form is usually achieved via hydrothermal routes. Here we synthesize GaOOH via the electrochemical oxidation of gallium based liquid metals in solutions of 0.1 M NaNO
Phase engineering of dual active 2D Bi2O3-based nanocatalysts for alkaline hydrogen evolution reaction electrocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA09019D
Abstract: In situ fabricated Bi 2 O 3 nanosheets with both α-Bi 2 O 3 and Bi x Ni alloy phases, simultaneously contributing to the water dissociation step and the hydrogen formation step, demonstrate high HER electrocatalytic activity in alkaline media.
Enhanced electrochemical heavy metal ion sensor using liquid metal marbles-Towards on-chip application
Publisher: IEEE
Date: 12-2012
Utilizing Room Temperature Liquid Metals for Mechanically Robust Silicon Anodes in Lithium‐Ion Batteries
Publisher: Wiley
Date: 08-2018
Superhydrophobic Fabrics for Oil/Water Separation Based on the Metal–Organic Charge‐Transfer Complex CuTCNAQ
Publisher: Wiley
Date: 07-03-2016
Abstract: The fabrication of a superhydrophobic nylon textile based on the organic charge-transfer complex CuTCNAQ (TCNAQ=11,11,12,12-tetracyanoanthraquinodimethane) is reported. The nylon fabric, which is metallized with copper, undergoes a spontaneous chemical reaction with TCNAQ dissolved in acetonitrile to form nanorods of CuTCNAQ that are intertwined over the entire surface of the fabric. This creates the necessary micro- and nanoscale roughness that often allows the Cassie-Baxter state to be obtained with high robustness, thereby achieving a superhydrophobic/superoleophilic surface without the need for a fluorinated surface. The material is characterized with SEM, FTIR spectroscopy, and X-ray photoelectron spectroscopy, and investigated for its ability to separate oil and water in two modes, namely through filtration and as an absorbent material. It is found that the fabric can separate dichloromethane, olive oil, and crude oil from water, and reduce the water content of the oil during the separation process. The fabric is reusable, highly durable, and tolerant to conditions such as seawater, hydrochloric acid, and extensive time periods on the shelf. Given that CuTCNAQ is a copper-based semiconductor, there may also be the possibility of other uses in areas such as photocatalysis and antibacterial applications.
An amorphous dual action electrocatalyst based on oxygen doped cobalt sulfide for the hydrogen and oxygen evolution reactions
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA10394H
Abstract: Here we electrodeposit an amorphous bifunctional electrocatalyst that is active for both the HER and OER under alkaline conditions which is based on oxygen doped cobalt sulfide.
Electrochemical formation of Cu/Ag surfaces and their applicability as heterogeneous catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3RA47557C
Electrochemical Synthesis of a Multipurpose Pt−Ni Catalyst for Renewable Energy‐Related Electrocatalytic Reactions
Publisher: Wiley
Date: 02-11-2020
Galvanic replacement mediated synthesis of hollow Pt nanocatalysts: Significance of residual Ag for the H2 evolution reaction
Publisher: Elsevier BV
Date: 08-2009
Biological shape-controlled synthesis of silver nanoplates
Publisher: IEEE
Date: 02-2010
Electrochemical formation of platinum nanostructures for fuel cell applications
Publisher: IEEE
Date: 02-2010
Investigation of thiophene flanked diketopyrrolopyrrole monomers with straight and branched alkyl chains and their electropolymerization study
Publisher: Springer Science and Business Media LLC
Date: 15-05-2017
DOI: 10.1557/JMR.2017.158
TLR2 on blood monocytes senses dengue virus infection and its expression correlates with disease pathogenesis
Publisher: Springer Science and Business Media LLC
Date: 23-06-2020
DOI: 10.1038/S41467-020-16849-7
Abstract: Vascular permeability and plasma leakage are immune-pathologies of severe dengue virus (DENV) infection, but the mechanisms underlying the exacerbated inflammation during DENV pathogenesis are unclear. Here, we demonstrate that TLR2, together with its co-receptors CD14 and TLR6, is an innate sensor of DENV particles inducing inflammatory cytokine expression and impairing vascular integrity in vitro. Blocking TLR2 prior to DENV infection in vitro abrogates NF-κB activation while CD14 and TLR6 block has a moderate effect. Moreover, TLR2 block prior to DENV infection of peripheral blood mononuclear cells prevents activation of human vascular endothelium, suggesting a potential role of the TLR2-responses in vascular integrity. TLR2 expression on CD14 + + classical monocytes isolated in an acute phase from DENV-infected pediatric patients correlates with severe disease development. Altogether, these data identify a role for TLR2 in DENV infection and provide insights into the complex interaction between the virus and innate receptors that may underlie disease pathogenesis.
Antibody coated conductive polymer for the electrochemical immunosensing of Human Cardiac Troponin I in blood plasma.
Publisher: Elsevier BV
Date: 11-2021
A study of localised galvanic replacement of copper and silver films with gold using scanning electrochemical microscopy
Publisher: Elsevier BV
Date: 05-2010
Preparation of “Co-Nx Carbon Net” Protected CoFe Alloy on Carbon Nanotubes as an Efficient Bifunctional Electrocatalyst in Zn-Air Batteries
Publisher: American Chemical Society (ACS)
Date: 17-01-0002
Utilization of plasma in water desalination and purification
Publisher: Elsevier BV
Date: 03-2021
Confining the electrodeposition of FeCoNi oxide within a Nafion layer for the fabrication of stable oxygen evolution electrocatalysts
Publisher: Elsevier BV
Date: 09-2023
Measurement of Lateral Charge Propagation in [Os(bpy)2(PVP)nCl]Cl Thin Films: A Scanning Electrochemical Microscopy Approach
Publisher: American Chemical Society (ACS)
Date: 05-05-2004
DOI: 10.1021/JP049500V
Electrocrystallization of Phase I, CuTCNQ (TCNQ = 7,7,8,8-Tetracyanoquinodimethane), on Indium Tin Oxide and Boron-Doped Diamond Electrodes
Publisher: American Chemical Society (ACS)
Date: 19-07-2006
DOI: 10.1021/LA060408V
Abstract: The electrochemical reduction of TCNQ to TCNQ*- in acetonitrile in the presence of [Cu(MeCN)4]+ has been undertaken at boron-doped diamond (BDD) and indium tin oxide (ITO) electrodes. The nucleation and growth process at BDD is similar to that reported previously at metal electrodes. At an ITO electrode, the electrocrystallization of more strongly adhered, larger, branched, needle-shaped phase I CuTCNQ crystals is detected under potential step conditions and also when the potential is cycled over the potential range of 0.7 to -0.1 V versus Ag/AgCl (3 M KCl). Video imaging can be used at optically transparent ITO electrodes to monitor the growth stage of the very large branched crystals formed during the course of electrochemical experiments. Both in situ video imaging and ex situ X-ray diffraction and scanning electron microscopy (SEM) data are consistent with the nucleation of CuTCNQ taking place at a discrete number of preferred sites on the ITO surface. At BDD electrodes, ex situ optical images show that the preferential growth of CuTCNQ occurs at the more highly conducting boron-rich areas of the electrode, within which there are preferred sites for CuTCNQ formation.
Transparent and Flexible Mn1−x−y(CexLay)O2−δ Ultrathin‐Film Device for Highly‐Stable Pseudocapa
Publisher: Wiley
Date: 31-05-2021
Abstract: Control over the fabrication of state‐of‐the‐art portable pseudocapacitors with the desired transparency, mechanical flexibility, capacitance, and durability is challenging, but if resolved will have fundamental implications. Here, defect‐rich Mn 1− x − y (Ce x La y )O 2−δ ultrathin films with controllable thicknesses (5–627 nm) and transmittance (≈29–100%) are fabricated via an electrochemical chrono erometric deposition using a aqueous precursor derived from end‐of‐life nickel‐metal hydride batteries. Due to percolation impacts on the optoelectronic properties of ultrathin films, a representative Mn 1− x − y (Ce x La y )O 2−δ film with 86% transmittance exhibits an outstanding areal capacitance of 3.4 mF cm −2 , mainly attributed to the intercalation/de‐intercalation of anionic O 2− through the atomic tunnels of the stratified Mn 1− x − y (Ce x La y )O 2−δ crystallites. Furthermore, the Mn 1− x − y (Ce x La y )O 2−δ thin‐film device exhibits excellent capacitance retention of ≈90% after 16 000 cycles. Such stability is associated with intervalence charge transfer occurring among interstitial Ce/La cations and Mn oxidation states within the Mn 1− x − y (Ce x La y )O 2−δ structure. The energy and power densities of the transparent flexible Mn 1− x − y (Ce x La y )O 2−δ full‐cell pseudocapacitor device, is measured to be 0.088 μWh cm −2 and 843 µW cm −2 , respectively. These values show insignificant changes under vigorous twisting and bending to 45–180° confirming these value‐added materials are intriguing alternatives for size‐sensitive energy storage devices.
Tuning the electrocrystallization parameters of semiconducting Co[TCNQ]2 -based materials to yield either single nanowires or crystalline thin films
Publisher: American Chemical Society (ACS)
Date: 31-01-2007
DOI: 10.1021/JA067219J
Abstract: Electrocrystallization of single nanowires and/or crystalline thin films of the semiconducting and magnetic Co[TCNQ]2(H2O)2 (TCNQ=tetracyanoquinodimethane) charge-transfer complex onto glassy carbon, indium tin oxide, or metallic electrodes occurs when TCNQ is reduced in acetonitrile (0.1 M [NBu4][ClO4]) in the presence of hydrated cobalt(II) salts. The morphology of the deposited solid is potential dependent. Other factors influencing the electrocrystallization process include deposition time, concentration, and identity of the Co2+(MeCN) counteranion. Mechanistic details have been elucidated by use of cyclic voltammetry, chrono erometry, electrochemical quartz crystal microbalance, and galvanostatic methods together with spectroscopic and microscopic techniques. The results provide direct evidence that electrocrystallization takes place through two distinctly different, potential-dependent mechanisms, with progressive nucleation and 3-D growth being controlled by the generation of [TCNQ]*- at the electrode and the diffusion of Co2+(MeCN) from the bulk solution. Images obtained by scanning electron microscopy reveal that electrocrystallization of Co[TCNQ]2(H2O)2 at potentials in the range of 0.1-0 V vs Ag/AgCl, corresponding to the [TCNQ]0/*- diffusion-controlled regime, gives rise to arrays of well-separated, needle-shaped nanowires via the overall reaction 2[TCNQ]*-(MeCN)+Co2+(MeCN)+2H2O right harpoon over left harpoon {Co[TCNQ]2(H2O)2}(s). In this potential region, nucleation and growth occur at randomly separated defect sites on the electrode surface. In contrast, at more negative potentials, a compact film of densely packed, uniformly oriented, hexagonal-shaped nanorods is formed. This is achieved at a substantially increased number of nucleation sites created by direct reduction of a thin film of what is proposed to be cobalt-stabilized {(Co2+)([TCNQ2]*-)2} dimeric anion. Despite the potential-dependent morphology of the electrocrystallized Co[TCNQ]2(H2O)2 and the markedly different nucleation-growth mechanisms, IR, Raman, elemental, and thermogravimetric analyses, together with X-ray diffraction, all confirmed the formation of a highly pure and crystalline phase of Co[TCNQ]2(H2O)2 on the electrode surface. Thus, differences in the electrodeposited material are confined to morphology and not to phase or composition differences. This study highlights the importance of the electrocrystallization approach in constructing and precisely controlling the morphology and stoichiometry of Co[TCNQ]2-based materials.
Generation of catalytically active materials from a liquid metal precursor
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC05246G
Abstract: A facile route to prepare catalytically active materials from a liquid metal alloy is introduced. Sonication of liquid galinstan (GaInSn) in alkaline solution or treating it with reducing agents generates In : Sn rich microspheres that are catalytically active for electron transfer reactions such as potassium ferricyanide and 4-nitrophenol reduction.
AFM study of morphological changes associated with electrochemical solid-solid transformation of three-dimensional crystals of TCNQ to metal derivatives (metal∈=∈Cu, Co, Ni; TCNQ∈= ∈tetracyanoquinodimethane)
Publisher: Springer Science and Business Media LLC
Date: 27-09-2008
Hybrid CuTCNQ/AgTCNQ Metal‐Organic Charge Transfer Complexes via Galvanic Replacement vs Corrosion‐Recrystallization
Publisher: Wiley
Date: 06-10-2014
Broadband light active MTCNQ-based metal–organic semiconducting hybrids for enhanced redox catalysis
Publisher: Elsevier BV
Date: 12-2018
Theoretical Evaluation of Highly Efficient Nitrate Reduction to Ammonia on InBi
Publisher: American Chemical Society (ACS)
Date: 03-2023
Conversion of Catalytically Inert 2D Bismuth Oxide Nanosheets for Effective Electrochemical Hydrogen Evolution Reaction Catalysis via Oxygen Vacancy Concentration Modulation
Publisher: Springer Science and Business Media LLC
Date: 04-2022
DOI: 10.1007/S40820-022-00832-6
Abstract: Oxygen vacancies ( V o ) in electrocatalysts are closely correlated with the hydrogen evolution reaction (HER) activity. The role of vacancy defects and the effect of their concentration, however, yet remains unclear. Herein, Bi 2 O 3 , an unfavorable electrocatalyst for the HER due to a less than ideal hydrogen adsorption Gibbs free energy (Δ G H* ), is utilized as a perfect model to explore the function of V o on HER performance. Through a facile plasma irradiation strategy, Bi 2 O 3 nanosheets with different V o concentrations are fabricated to evaluate the influence of defects on the HER process. Unexpectedly, while the generated oxygen vacancies contribute to the enhanced HER performance, higher V o concentrations beyond a saturation value result in a significant drop in HER activity. By tunning the V o concentration in the Bi 2 O 3 nanosheets via adjusting the treatment time, the Bi 2 O 3 catalyst with an optimized oxygen vacancy concentration and detectable charge carrier concentration of 1.52 × 10 24 cm −3 demonstrates enhanced HER performance with an overpotential of 174.2 mV to reach 10 mA cm −2 , a Tafel slope of 80 mV dec −1 , and an exchange current density of 316 mA cm −2 in an alkaline solution, which approaches the top-tier activity among Bi-based HER electrocatalysts. Density-functional theory calculations confirm the preferred adsorption of H* onto Bi 2 O 3 as a function of oxygen chemical potential (∆ μ O ) and oxygen partial potential ( P O2 ) and reveal that high V o concentrations result in excessive stability of adsorbed hydrogen and hence the inferior HER activity. This study reveals the oxygen vacancy concentration-HER catalytic activity relationship and provides insights into activating catalytically inert materials into highly efficient electrocatalysts.
Repurposing the current collector of a car battery module into a bifunctional electrode for overall electrochemical water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SE00232B
Abstract: Repurposing the anode current collector from a vehicle battery is a viable approach for creating an active and bifunctional electrocatalyst for electrochemical green hydrogen production.
Power-to-decarbonization: Mesoporous carbon-MgO nanohybrid derived from plasma-activated seawater salt-loaded biomass for efficient CO2 capture
Publisher: Elsevier BV
Date: 11-2021
Reversible Intercalation of Multivalent Al3+ Ions into Potassium-Rich Cryptomelane Nanowires for Aqueous Rechargeable Al-Ion Batteries
Publisher: Wiley
Date: 24-06-2019
Abstract: The development of new battery technology that utilizes abundant electrode materials that are environmentally benign is an important area of research. To alleviate the reliance on Li-ion batteries new energy storage mechanisms are urgently needed. To address these issues, MnO
Synthesis of CuTCNQ/Au Microrods by Galvanic Replacement of Semiconducting Phase I CuTCNQ with KAuBr4 in Aqueous Medium
Publisher: American Chemical Society (ACS)
Date: 08-2012
DOI: 10.1021/IC300555J
Abstract: The spontaneous reaction between microrods of an organic semiconductor molecule, copper 7,7,8,8-tetracyanoquinodimethane (CuTCNQ) with [AuBr(4)](-) ions in an aqueous environment is reported. The reaction is found to be redox in nature which proceeds via a complex galvanic replacement mechanism, wherein the surface of the CuTCNQ microrods is replaced with metallic gold nanoparticles. Unlike previous reactions reported in acetonitrile, the galvanic replacement reaction in aqueous solution proceeds via an entirely different reaction mechanism, wherein a cyclical reaction mechanism involving continuous regeneration of CuTCNQ consumed during the galvanic replacement reaction occurs in parallel with the galvanic replacement reaction. This results in the driving force of the galvanic replacement reaction in aqueous medium being largely dependent on the availability of [AuBr(4)](-) ions during the reaction. Therefore, this study highlights the importance of the choice of an appropriate solvent during galvanic replacement reactions, which can significantly impact upon the reaction mechanism. The reaction progress with respect to different gold salt concentration was monitored using Fourier transform infrared (FT-IR), Raman, and X-ray photoelectron spectroscopy (XPS), as well as XRD and EDX analysis, and SEM imaging. The CuTCNQ/Au nanocomposites were also investigated for their potential photocatalytic properties, wherein the destruction of the organic dye, Congo red, in a simulated solar light environment was found to be largely dependent on the degree of gold nanoparticle surface coverage. The approach reported here opens up new possibilities of decorating metal-organic charge transfer complexes with a host of metals, leading to potentially novel applications in catalysis and sensing.
Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces
Publisher: Springer Science and Business Media LLC
Date: 26-02-2019
DOI: 10.1038/S41467-019-08824-8
Abstract: Negative carbon emission technologies are critical for ensuring a future stable climate. However, the gaseous state of CO 2 does render the indefinite storage of this greenhouse gas challenging. Herein, we created a liquid metal electrocatalyst that contains metallic elemental cerium nanoparticles, which facilitates the electrochemical reduction of CO 2 to layered solid carbonaceous species, at a low onset potential of −310 mV vs CO 2 /C. We exploited the formation of a cerium oxide catalyst at the liquid metal/electrolyte interface, which together with cerium nanoparticles, promoted the room temperature reduction of CO 2 . Due to the inhibition of van der Waals adhesion at the liquid interface, the electrode was remarkably resistant to deactivation via coking caused by solid carbonaceous species. The as-produced solid carbonaceous materials could be utilised for the fabrication of high-performance capacitor electrodes. Overall, this liquid metal enabled electrocatalytic process at room temperature may result in a viable negative emission technology.
A Tribute to Alan Bond on his 70th Birthday: 50 Years of Electrochemistry
Publisher: Wiley
Date: 28-02-2018
Galvanic Replacement of Semiconductor Phase I CuTCNQ Microrods with KAuBr4 to Fabricate CuTCNQ/Au Nanocomposites with Photocatalytic Properties
Publisher: American Chemical Society (ACS)
Date: 19-01-2011
DOI: 10.1021/IC1021752
Abstract: In this study, the reaction of semiconductor microrods of phase I copper 7,7,8,8-tetracyanoquinodimethane (CuTCNQ) with KAuBr(4) in acetonitrile is reported. It was found that the reaction is redox in nature and proceeds via a galvanic replacement mechanism in which the surface of CuTCNQ is replaced with metallic gold nanoparticles. Given the slight solubility of CuTCNQ in acetonitrile, two competing reactions, namely CuTCNQ dissolution and the redox reaction with KAuBr(4), were found to operate in parallel. An increase in the surface coverage of CuTCNQ microrods with gold nanoparticles occurred with an increased KAuBr(4) concentration in acetonitrile, which also inhibited CuTCNQ dissolution. The reaction progress with time was monitored using UV-visible, FT-IR, and Raman spectroscopy as well as XRD and EDX analysis, and SEM imaging. The CuTCNQ/Au nanocomposites were investigated for their photocatalytic properties, wherein the destruction of Congo red, an organic dye, by simulated solar light was found dependent on the surface coverage of gold nanoparticles on the CuTCNQ microrods. This method of decorating CuTCNQ may open the possibility of modifying this and other metal-TCNQ charge transfer complexes with a host of other metals which may have significant applications.
Exploring Electrochemical Extrusion of Wires from Liquid Metals
Publisher: American Chemical Society (ACS)
Date: 17-06-2020
From single crystal surfaces to single atoms: investigating active sites in electrocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR00419A
Abstract: Electrocatalysis will be at the heart of energising future transportation and technology. This article discusses the critical role of active sites and the recent efforts in their characterisation and visualisation.
Scanning electrochemical microscopy study of the solid–solid interconversion of TCNQ to phase I and phase II CuTCNQ
Publisher: Elsevier BV
Date: 08-2012
Bi-Sn Catalytic Foam Governed by Nanometallurgy of Liquid Metals
Publisher: American Chemical Society (ACS)
Date: 05-05-2020
Electrochemistry at Modified Interfaces: Foreword
Publisher: Elsevier BV
Date: 12-2017
Density Functional Theory Investigation of Carbon Dots as Hole‐transport Material in Perovskite Solar Cells
Publisher: Wiley
Date: 08-10-2018
Abstract: Charge transfer in solar cells is crucial, and so is the hole transporting layer (HTL) component in perovskite solar cells (PSCs). Finding a suitable material for this purpose that is inexpensive - either organic or inorganic - is currently one of the prime research objectives to improve the performance, through charge transfer dynamics, of PSCs.< One such recent finding is carbon quantum dots (C-dots), which is a simple and low-cost organic material that could be an alternative option to the currently employed high-cost and complex-structured hole transporting materials (HTMs) utilized in perovskite solar cells. A series of C-dots functionalized with hydrogen, hydroxyl (-OH), and carboxyl (-COOH) groups are considered in this study for their hole-transporting properties. The results reveal that simple hexagonal structured C-dots including -OH and -COOH group substituted C-dots have suitable valance band maximum (VBM) positions, which are suitable for hole transport. It is discovered that the position of the functional moieties on the C-dots would impact the band-edge positions of the C-dots. This implies that tuning the band position is possible so that these two-dimensional C-dots could, in principle, be used for other solar-cell applications that may require different band positions for optimal performance. As a representative ex le, we studied the perovskite/C-Dot interface of two different possible surfaces (i. e. MAI and PbI
The formation of gold nanoparticles using hydroquinone as a reducing agent through a localized pH change upon addition of NaOH to a solution of HAuCl4
Publisher: Elsevier BV
Date: 11-2010
Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids
Publisher: MDPI AG
Date: 17-09-2018
DOI: 10.3390/NANO8090735
Abstract: Electrochemical gas sensors are often used for identifying and quantifying redox-active analyte gases in the atmosphere. However, for erometric sensors, the current signal is usually dependent on the electroactive surface area, which can become small when using microelectrodes and miniaturized devices. Microarray thin-film electrodes (MATFEs) are commercially available, low-cost devices that give enhanced current densities compared to mm-sized electrodes, but still give low current responses (e.g., less than one nano ), when detecting low concentrations of gases. To overcome this, we have modified the surface of the MATFEs by depositing platinum into the recessed holes to create arrays of 3D structures with high surface areas. Dendritic structures have been formed using an additive, lead acetate (Pb(OAc)2) into the plating solution. One-step and two-step depositions were explored, with a total deposition time of 300 s or 420 s. The modified MATFEs were then studied for their behavior towards oxygen reduction in the room temperature ionic liquid (RTIL) [N8,2,2,2][NTf2]. Significantly enhanced currents for oxygen were observed, ranging from 9 to 16 times the current of the unmodified MATFE. The highest sensitivity was obtained using a two-step deposition with a total time of 420 s, and both steps containing Pb(OAc)2. This work shows that commercially-available microelectrodes can be favorably modified to give significantly enhanced analytical performances.
Investigation of the electrochemical growth of a Cu–Zn–Sn film on a molybdenum substrate using a citrate solution
Publisher: Springer Science and Business Media LLC
Date: 11-05-2016
New Spin on Organic Radical Batteries–An Isoindoline Nitroxide-Based High-Voltage Cathode Material
Publisher: American Chemical Society (ACS)
Date: 07-02-2018
Abstract: Organic electrode materials are a highly promising and environmentally benign class of battery materials with radical polymers being at the forefront of this research. Herein, we report the first ex le of the 1,1,3,3-tetramethylisoindolin-2-yloxyl class of nitroxides as an organic electrode material and the synthesis and application of a novel styrenic nitroxide polymer, poly(5-vinyl-1,1,3,3-tetramethylisoindolin-2-yloxyl) (PVTMIO). The polymer was synthesized from the precursor monomer, 2-methoxy-5-vinyl-1,1,3,3-tetramethylisoindoline, and subsequent oxidative deprotection yielded the electroactive radical species. Cyclic voltammetry revealed a high oxidation potential of 3.7 V versus Li, placing it among the top of the nitroxide class of electrode materials. The suitability of PVTMIO for utilization in a high-voltage organic radical battery was confirmed with a discharge capacity of 104.7 mAh g
Conversion of Iron Ore into an Active Catalyst for the Oxygen Evolution Reaction
Publisher: Wiley
Date: 07-05-2018
Rapid electrochemical detection of coronavirus SARS-CoV-2
Publisher: Springer Science and Business Media LLC
Date: 05-02-2021
DOI: 10.1038/S41467-021-21121-7
Abstract: Coronavirus disease 2019 (COVID-19) is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Diagnosis of COVID-19 depends on quantitative reverse transcription PCR (qRT-PCR), which is time-consuming and requires expensive instrumentation. Here, we report an ultrasensitive electrochemical biosensor based on isothermal rolling circle lification (RCA) for rapid detection of SARS-CoV-2. The assay involves the hybridization of the RCA licons with probes that were functionalized with redox active labels that are detectable by an electrochemical biosensor. The one-step sandwich hybridization assay could detect as low as 1 copy/μL of N and S genes, in less than 2 h. Sensor evaluation with 106 clinical s les, including 41 SARS-CoV-2 positive and 9 s les positive for other respiratory viruses, gave a 100% concordance result with qRT-PCR, with complete correlation between the biosensor current signals and quantitation cycle (Cq) values. In summary, this biosensor could be used as an on-site, real-time diagnostic test for COVID-19.
The application and improvement of TiO2 (titanate) based nanomaterials for the photoelectrochemical conversion of CO2 and N2 into useful products
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CY02048F
Abstract: In this review, we describe the photoelectrochemical (PEC) transformation of atmospheric species such as carbon dioxide (CO 2 ) and nitrogen (N 2 ) into useful industrial products on TiO 2 and TiO 2 composite photoelectrodes.
Liquid metal/metal oxide frameworks with incorporated Ga2 O3 for photocatalysis
Publisher: American Chemical Society (ACS)
Date: 14-01-2015
DOI: 10.1021/AM5077364
Abstract: Solvothermally synthesized Ga2O3 nanoparticles are incorporated into liquid metal/metal oxide (LM/MO) frameworks in order to form enhanced photocatalytic systems. The LM/MO frameworks, both with and without incorporated Ga2O3 nanoparticles, show photocatalytic activity due to a plasmonic effect where performance is related to the loading of Ga2O3 nanoparticles. Optimum photocatalytic efficiency is obtained with 1 wt % incorporation of Ga2O3 nanoparticles. This can be attributed to the sub-bandgap states of LM/MO frameworks, contributing to pseudo-ohmic contacts which reduce the free carrier injection barrier to Ga2O3.
Co-Electrodeposition of Nanostructured Ce-NiOx on Stainless-Steel Substrates for the Oxygen Evolution Reaction under Alkaline Conditions
Publisher: Wiley
Date: 10-2022
Abstract: The development of cost‐effective catalysts that can be fabricated at scale for electrochemical water oxidation is an ongoing challenge. Here it is shown that stainless‐steel AISI316 is an appropriate support electrode for a co‐electrodeposited Ni‐CeO x catalyst for the oxygen evolution reaction (OER) under alkaline conditions. Optimal OER performance is achieved via a cyclic voltammetric deposition protocol rather than constant potential deposition for the catalyst layer. An overpotential of 300 mV at a current density of 10 mA cm −2 is recorded with a Tafel slope of 43 mV dec −1 while the catalyst also demonstrates long‐term stability. It is also found that the catalyst layer changes significantly after the OER. This includes changes to the catalyst morphology, distribution of oxidation state, and speciation as well as the transformation from an entirely amorphous material into one containing crystalline regions. This simple one‐step electrodeposition process on a cost‐effective substrate should, in principle, facilitate the fabrication of low‐cost electrolyzers.
Exploiting the Facile Oxidation of Evaporated Gold Films to Drive Electroless Silver Deposition for the Creation of Bimetallic Au/Ag Surfaces
Publisher: Wiley
Date: 10-09-2013
Investigation of Room Temperature Gas Sensing Properties of Metal-Organic Charge Transfer Complex CuTCNQF4
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TC03548E
Abstract: The ability to detect and monitor toxic and greenhouse gases is highly important, however to achieve this at room temperature and allow for remote sensing applications is a significant challenge.
A liquid metal reaction environment for the room-temperature synthesis of atomically thin metal oxides
Publisher: American Association for the Advancement of Science (AAAS)
Date: 20-10-2017
Abstract: Two-dimensional (2D) materials have a wide variety of potential applications in the electronics industry. However, certain compositions of 2D materials are difficult to obtain owing to the challenges in exfoliating thin sheets from bulk crystals. Zavabeti et al. exploited liquid metals to synthesize 2D Ga 2 O 3 , HfO 2 , Gd 2 O 3 , and Al 2 O 3 . The 2D sheets appear as a surface layer in gallium-based liquid metals after the Hf, Gd, or Al is dissolved into the bulk alloy. The 2D oxide that appears on the surface is the oxide with the lowest energy, suggesting that it should be possible to make other 2D oxides by using the same process. Science , this issue p. 332
Sonication synthesis of micro-sized silver nanoparticle/oleic acid liquid marbles: A novel SERS sensing platform
Publisher: Elsevier BV
Date: 02-2016
Investigating the effect of ionic strength on the suppression of dendrite formation during metal electrodeposition
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CP00839B
Abstract: The effect of ionic strength on dendrite formation and suppression has been investigated in an organic solvent (acetonitrile containing TBAPF 6 ) and in the ionic liquid [EMIm][OTf].
The role of defects, or active states, in surface electrochemistry with particular reference to gold in neutral solution
Publisher: Springer Science and Business Media LLC
Date: 12-2003
Manganese Oxide Derived from a Spent Zn–C Battery as a Catalyst for the Oxygen Evolution Reaction
Publisher: Wiley
Date: 04-05-2020
Electrochemical restructuring of Gold electrodes with redox active species to create electrocatalytically active nanostructured surfaces
Publisher: Elsevier BV
Date: 05-2020
Electrochemical Behavior and Redox-Dependent Disassembly of Gallic Acid/FeIII Metal-Phenolic Networks
Publisher: American Chemical Society (ACS)
Date: 30-01-2018
Abstract: Metal-phenolic networks (MPNs) are a versatile class of organic-inorganic hybrid systems that are generating interest for applications in catalysis, bioimaging, and drug delivery. These self-assembled MPNs possess metal-coordinated structures and may potentially serve as redox-responsive platforms for triggered disassembly or drug release. Therefore, a comprehensive study of the reduction and oxidation behavior of MPNs for evaluating their redox responsiveness, specific conditions required for their disassembly, and the kinetics of metal ion release, is necessary. Using a representative MPN gallic acid-iron (GA/Fe
Distinction of the Two Phases of CuTCNQ by Scanning Electrochemical Microscopy
Publisher: American Chemical Society (ACS)
Date: 29-07-2005
DOI: 10.1021/AC050172K
Abstract: The two known phases of CuTCNQ and TCNQ (TCNQ = 7,7',8,8'-tetracyanoquinodimethane) have been probed by scanning electrochemical microscopy (SECM) in the feedback mode. The first use of this technique for distinguishing differences in the electronic properties of semiconductor phases exploits the large differences in conductivity that exist between CuTCNQ and the parent TCNQ material and also between the CuTCNQ phases I and II. However, the packing density of the in idual CuTCNQ crystals in a film structure also is shown to influence the SECM feedback response. Finally, it is shown that films of pure phase II material or mixtures of the phases can be mapped using feedback mode SECM. The SECM method provides valuable insights for elucidating properties of semiconducting solids that are mounted on insulating substrates.
Fabrication of nanostructured SERS substrates on conductive solid platforms for environmental application
Publisher: Informa UK Limited
Date: 20-02-2019
Stabilizing lithium metal using ionic liquids for long-lived batteries
Publisher: Springer Science and Business Media LLC
Date: 13-06-2016
DOI: 10.1038/NCOMMS11794
Abstract: Suppressing dendrite formation at lithium metal anodes during cycling is critical for the implementation of future lithium metal-based battery technology. Here we report that it can be achieved via the facile process of immersing the electrodes in ionic liquid electrolytes for a period of time before battery assembly. This creates a durable and lithium ion-permeable solid–electrolyte interphase that allows safe charge–discharge cycling of commercially applicable Li|electrolyte|LiFePO 4 batteries for 1,000 cycles with Coulombic efficiencies .5%. The tailored solid–electrolyte interphase is prepared using a variety of electrolytes based on the N -propyl- N -methylpyrrolidinium bis(fluorosulfonyl)imide room temperature ionic liquid containing lithium salts. The formation is both time- and lithium salt-dependant, showing dynamic morphology changes, which when optimized prevent dendrite formation and consumption of electrolyte during cycling. This work illustrates that a simple, effective and industrially applicable lithium metal pretreatment process results in a commercially viable cycle life for a lithium metal battery.
Versatile two-dimensional silicon diphosphide (SiP2) for photocatalytic water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR07994J
Abstract: Two-dimensional (2D) photocatalysts with excellent light absorption and favorable band alignment are critical for highly-efficient water splitting.
Electrocatalytic water oxidation at amorphous trimetallic oxides based on FeCoNiOx
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA07995H
Abstract: The rapid electrochemical formation of amorphous FeCoNiO x is reported which is both active and stable for the oxygen evolution reaction under alkaline conditions.
Mechanical energy-induced CO2 conversion using liquid metals
Publisher: Research Square Platform LLC
Date: 11-12-2020
DOI: 10.21203/RS.3.RS-112257/V1
Abstract: We report a green carbon capture and conversion technology offering scalability and economic viability for mitigating CO 2 emissions. The technology uses suspensions of gallium liquid metal to reduce CO 2 into carbonaceous solid products and O 2 at near room temperature. The nonpolar nature of the liquid gallium interface allows the solid products to instantaneously exfoliate, hence keeping active sites accessible. The solid co-contributor of silver-gallium rods ensures a cyclic sustainable process. The overall process relies on mechanical energy as the input, which drives nano dimensional triboelectrochemical reactions. By altering the secondary solvent and changing the reactor height, the dissolution and conversion efficiency can be tuned. The optimum reactor height is only 27 cm, when gallium/silver fluoride mix at 7:1 mass ratio is employed as the reaction material. At CO 2 input of ~8 sccm, 92% efficiency was obtained at the record low input energy of 228.5 kW∙h for the capture and conversion of a tonne of CO 2 . The potential impact of this green technology is remarkable, likely benefiting a variety of industries and offering an economical solution for CO 2 capture and conversion.
Electropolymerized Porous Polymer Films on Flexible Indium Tin Oxide Using Trifunctional Furan Substituted Benzene Conjugated Monomer for Biosensing
Publisher: American Chemical Society (ACS)
Date: 17-01-2020
Exploring Aluminum-Ion Insertion into Magnesium-Doped Manjiroite (MnO2) Nanorods in Aqueous Solution
Publisher: Wiley
Date: 23-12-2021
Conversion of n-Type CuTCNQ into p-Type Nitrogen-Doped CuO and the Implication for Room-Temperature Gas Sensing
Publisher: American Chemical Society (ACS)
Date: 14-09-2015
Low temperature mechano-catalytic biofuel conversion using liquid metals
Publisher: Elsevier BV
Date: 2023
The anodized crystalline WO3 nanoporous network with enhanced electrochromic properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR31203D
Abstract: We demonstrate that a three dimensional (3D) crystalline tungsten trioxide (WO(3)) nanoporous network, directly grown on a transparent conductive oxide (TCO) substrate, is a suitable working electrode material for high performance electrochromic devices. This nanostructure, with achievable thicknesses of up to 2 μm, is prepared at room temperature by the electrochemical anodization of a RF-sputtered tungsten film deposited on a fluoride doped tin oxide (FTO) conductive glass, under low applied anodic voltages and mild chemical dissolution conditions. For the crystalline nanoporous network with thicknesses ranging from 0.6 to 1 μm, impressive coloration efficiencies of up to 141.5 cm(2) C(-1) are achieved by applying a low coloration voltage of -0.25 V. It is also observed that there is no significant degradation of the electrochromic properties of the porous film after 2000 continuous coloration-bleaching cycles. The remarkable electrochromic characteristics of this crystalline and nanoporous WO(3) are mainly ascribed to the combination of a large surface area, facilitating increased intercalation of protons, as well as excellent continuous and directional paths for charge transfer and proton migration in the highly crystalline material.
Study of the Initial Stage of Solid Electrolyte Interphase Formation upon Chemical Reaction of Lithium Metal and N-Methyl-N-Propyl-Pyrrolidinium-Bis(Fluorosulfonyl)Imide
Publisher: American Chemical Society (ACS)
Date: 10-09-2012
DOI: 10.1021/JP304581G
The importance of the active states of surface atoms with regard to the electrocatalytic behaviour of metal electrodes in aqueous media
Publisher: Elsevier BV
Date: 08-2000
Electrochemical formation of porous copper 7,7,8,8-tetracyanoquinodimethane and copper 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane honeycomb surfaces with superhydrophobic properties
Publisher: Elsevier BV
Date: 07-2013
Electrochemical and photochemical routes to semiconducting transition metal-tetracyanoquinodimethane coordination polymers
Publisher: Elsevier BV
Date: 06-2014
Bacterial Kinetics-Controlled Shape-Directed Biosynthesis of Silver Nanoplates Using Morganella psychrotolerans
Publisher: American Chemical Society (ACS)
Date: 13-12-2010
DOI: 10.1021/LA1036162
Abstract: We show for the first time that by controlling the growth kinetics of Morganella psychrotolerans, a silver-resistant psychrophilic bacterium, the shape anisotropy of silver nanoparticles can be achieved. This is particularly important considering that there has been no report that demonstrates a control over shape of Ag nanoparticles by controlling the growth kinetics of bacteria during biological synthesis. Additionally, we have for the first time performed electrochemistry experiments on bacterial cells after exposing them to Ag(+) ions, which provide significant new insights about mechanistic aspects of Ag reduction by bacteria. The possibility to achieve nanoparticle shape control by using a "green" biosynthesis approach is expected to open up new exciting avenues for eco-friendly, large-scale, and economically viable shape-controlled synthesis of nanomaterials.
Control of Localized Nanorod Formation and Patterns of Semiconducting CuTCNQ Phase I Crystals by Scanning Electrochemical Microscopy
Publisher: American Chemical Society (ACS)
Date: 17-09-2005
DOI: 10.1021/JA050561W
Abstract: Use of the technique of scanning electrochemical microscopy (SECM) enables the surface of single crystals of 7,7',8,8'-tetracyanoquinodimethane (TCNQ) to be modified in a controlled manner to produce highly dense and micrometer sized regions of semiconducting phase I CuTCNQ nanorod crystals by a nucleation and growth mechanism. This method involves the localized reduction of solid TCNQ to TCNQ- by aqueous phase V(aq)2+ reductant generated at a SECM ultramicroelectrode tip by reduction of V(aq)3+, coupled with the incorporation and reduction of Cu(aq)2+ ions also present in the aqueous electrolyte. SECM parameters can be systematically varied to control the extent of surface modification and the packing density of the CuTCNQ crystals. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) images provide evidence that the TCNQ to CuTCNQ solid-solid transformation is accompanied by a drastic localized crystal volume and morphology change achieved by fragmentation of the TCNQ crystal surface. Patterns of semiconducting CuTCNQ (phase I) nanorod shaped crystals have been characterized by SEM, AFM, and infrared (IR) techniques. A reaction scheme has been proposed for the interaction between the electrogenerated mediator V(aq)2+, Cu(aq)2+, and the TCNQ crystal in the nucleation and growth stages of phase I CuTCNQ formation.
Template-assisted synthesis of high-efficiency bifunctional catalysts with roller-comb-like nanostructure for rechargeable zinc-air batteries
Publisher: Elsevier BV
Date: 02-2022
Sustainable Claisen-Schmidt chalcone synthesis catalysed by plasma-recovered MgO nanosheets from seawater
Publisher: Elsevier BV
Date: 07-2022
Electrochemical Formation of Amorphous Molybdenum Phosphosulfide for Enabling the Hydrogen Evolution Reaction in Alkaline and Acidic Media
Publisher: American Chemical Society (ACS)
Date: 06-06-2018
Multiscale Plasma‐Catalytic On‐Surface Assembly
Publisher: Wiley
Date: 21-08-2020
Abstract: Controlled modification of surfaces is one of the key pursuits of the nanoscience and nanotechnology fields, allowing for the fabrication of bespoke materials with targeted functionalities. However, many surface modifications currently require painstakingly precise and/or energy intensive processing to implement, and are thus limited in scope and scale. Here, a concept which can enhance the capacity for control of surfaces is introduced: plasma-assisted nucleation and self-assembly at atomic to nanoscales, scalable at atmospheric pressures.
Decoration of active sites to create bimetallic surfaces and its implication for electrochemical processes
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3FD00015J
Abstract: The creation of electrocatalysts based on noble metals has received a significant amount of research interest due to their extensive use as fuel cell catalysts and electrochemical sensors. There have been many attempts to improve the activity of these metals through creating nanostructures, as well as post-synthesis treatments based on chemical, electrochemical, sonochemical and thermal approaches. In many instances these methods result in a material with active surface states, which can be considered to be adatoms or clusters of atoms on the surface that have a low lattice co-ordination number making them more prone to electrochemical oxidation at a wide range of potentials that are significantly less positive than those of their bulk metal counterparts. This phenomenon has been termed pre-monolayer oxidation and has been reported to occur on a range of metallic surfaces. In this work we present findings on the presence of active sites on Pd that has been: evaporated as a thin film electrodeposited as nanostructures as well as commercially available Pd nanoparticles supported on carbon. Significantly, advantage is taken of the low oxidation potential of these active sites whereby bimetallic surfaces are created by the spontaneous deposition of Ag from AgNO3 to generate Pd/Ag surfaces. Interestingly this approach does not increase the surface area of the original metal but has significant implications for its further use as an electrode material. It results in the inhibition or promotion of electrocatalytic activity which is highly dependent on the reaction of interest. As a general approach the decoration of active catalytic materials with less active metals for a particular reaction also opens up the possibility of investigating the role of the initially present active sites on the surface and identifying the degree to which they are responsible for electrocatalytic activity.
Using H
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CC02797F
Abstract: We report a simple and rapid method for the synthesis of fluorescent gallium oxyhydroxide (GaOOH) nanoparticles from liquid Ga by a probe sonication method in the presence of H
Extensive charge–discharge cycling of lithium metal electrodes achieved using ionic liquid electrolytes
Publisher: Elsevier BV
Date: 02-2013
Gold and Platinum Decorated Iron Oxides As Efficient Overall Water Splitting Catalysts
Publisher: The Electrochemical Society
Date: 05-2020
DOI: 10.1149/MA2020-01371525MTGABS
Abstract: Transition metal oxides (TMOs) have gained much interest due their water splitting properties, producing oxygen and hydrogen as a clean source of energy, with the possibility of replacing fossil fuels for the future energy demands. Iron, Cobalt, Nickel and their oxides/oxyhydroxides have been investigated extensively due to their cost effectiveness and applicability in catalysing the water-splitting reaction, although there are some issues with performance degradation. In particular, recent studies on mixed metal oxides of Ni, Fe and Co show enhanced performance for oxygen and hydrogen production compared to the single metallic component. [1] Iron oxides do not show good activity for the OER or the HER but are attractive for such an application if their activity can be enhanced given the low cost of such materials. Interestingly, it has been shown that fast active sites at FeOOH are responsible for enhanced OER activity within the mixed oxide system of Ni and Co. [2] A more recent development is the pursuit of bifunctional materials that can catalyse both the OER and HER which is attractive from a commercial viewpoint and electrolyser manufacturing. Again if Fe based materials can be used for this reaction, it would be highly beneficial. In this work we galvanically replace iron and iron hydroxide nanostructures with Pt and Au and investigate the catalyst for both the OER and HER in an alkaline environment. The decoration of the iron surface with a low concentration of Pt or Au results in significantly increased activity for both the HER and more surprisingly the OER. The increased HER activity is expected as Pt is an excellent HER catalyst, however the presence of Au was also found to provide excellent performance. Although both Pt and Au are poor materials for the OER, they promote the reaction at iron oxide. To date, there have been no reports showing Au or Pt decorated Iron oxides that can split water effectively. The material was characterised using Scanning Electron Microscopy coupled with field emission spectra (SEM), Grazing Incidence X-ray Diffraction (GIXRD), X-ray Photoelectron Spectroscopy (XPS), and Transmission Electron Microscopy (TEM). The SAED and Dark Field Scanning Transmission Electron microscopy (DF-STEM) indicating that Au or Pt decorates the surface of the core polycrystalline nanocubes of iron. After the OER, a core-shell structure of Au-FeOOH or Pt-FeOOH is realised which is an effective bifunctional electrocatalyst that can catalyse both the OER and HER. [1] aM. S. Burke, L. J. Enman, A. S. Batchellor, S. Zou, S. W. J. C. o. M. Boettcher, 2015 , 27 , 7549-7558 bM. Görlin, P. Chernev, J. Ferreira de Araújo, T. Reier, S. r. Dresp, B. Paul, R. Krähnert, H. Dau, P. Strasser, Journal of the American Chemical Society 2016 , 138 , 5603-5614. [2] Z. Liang, H. S. Ahn, A. J. Bard, Journal of the American Chemical Society 2017 , 139 , 4854-4858. Figure 1
Robust Nanostructured Silver and Copper Fabrics with Localized Surface Plasmon Resonance Property for Effective Visible Light Induced Reductive Catalysis
Publisher: Wiley
Date: 07-01-2016
Liquid metal enabled continuous flow reactor: A proof-of-concept
Publisher: Elsevier BV
Date: 12-2021
High-throughput approach for the identification of anilinium-based ionic liquids that are suitable for electropolymerisation
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP02294K
Abstract: We report the synthesis of new protic ionic liquids (PILs) based on aniline derivatives and the use of high-throughput (HT) techniques to screen possible candidates.
Ultrafine CoP/Co2P Nanorods Encapsulated in Janus/Twins-type Honeycomb 3D Nitrogen-Doped Carbon Nanosheets for Efficient Hydrogen Evolution
Publisher: Elsevier BV
Date: 07-2020
Electrochromic properties of TiO2 nanotubes coated with electrodeposited MoO3
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR03666A
Abstract: Despite a favourable morphology, anodized and ordered TiO2 nanotubes are incapable of showing electrochromic properties in comparison to many other metal oxide counterparts. To tackle this issue, MoO3 of ~5 to 15 nm thickness was electrodeposited onto TiO2 nanotube arrays. A homogenous MoO3 coating was obtained and the crystal phase of the electrodeposited coating was determined to be α-MoO3. The electronic and optical augmentations of the MoO3 coated TiO2 platforms were evaluated through electrochromic measurements. The MoO3/TiO2 system showed a 4-fold increase in optical density over bare TiO2 when the thickness of the MoO3 coating was optimised. The enhancement was ascribed to (a) the α-MoO3 coating reducing the bandgap of the composite material, which shifted the band edge of the TiO2 platform, and subsequently increased the charge carrier transfer of the overall system and (b) the layered morphology of α-MoO3 that increased the intercalation probability and also provided direct pathways for charge carrier transfer.
Galvanic replacement of liquid metal galinstan with Pt for the synthesis of electrocatalytically active nanomaterials
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR02458A
Abstract: Here we galvanically replace liquid galinstan with Pt to create PtGa nanoparticles via expulsion from the liquid metal surface. These nanomaterials are active for a variety of electrocatalytic reactions.
A new method for electrocrystallization of AgTCNQF4 and Ag2TCNQF4 (TCNQF4 = 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) in acetonitrile
Publisher: Springer Science and Business Media LLC
Date: 12-07-2011
Computational exploration of two-dimensional silicon diarsenide and germanium arsenide for photovoltaic applications
Publisher: Beilstein Institut
Date: 19-04-2018
DOI: 10.3762/BJNANO.9.116
Abstract: The properties of bulk compounds required to be suitable for photovoltaic applications, such as excellent visible light absorption, favorable exciton formation, and charge separation are equally essential for two-dimensional (2D) materials. Here, we systematically study 2D group IV–V compounds such as SiAs 2 and GeAs 2 with regard to their structural, electronic and optical properties using density functional theory (DFT), hybrid functional and Bethe–Salpeter equation (BSE) approaches. We find that the exfoliation of single-layer SiAs 2 and GeAs 2 is highly feasible and in principle could be carried out experimentally by mechanical cleavage due to the dynamic stability of the compounds, which is inferred by analyzing their vibrational normal mode. SiAs 2 and GeAs 2 monolayers possess a bandgap of 1.91 and 1.64 eV, respectively, which is excellent for sunlight harvesting, while the exciton binding energy is found to be 0.25 and 0.14 eV, respectively. Furthermore, band-gap tuning is also possible by application of tensile strain. Our results highlight a new family of 2D materials with great potential for solar cell applications.
Liquid metal/metal oxide frameworks
Publisher: Wiley
Date: 10-03-2014
Auto-inhibition of hydrogen gas evolution on gold in aqueous acid solution
Publisher: Springer Science and Business Media LLC
Date: 03-04-2001
Voltammetric Monitoring of Gold Nanoparticle Formation Facilitated by Glycyl-l -Tyrosine: Relation to Electronic Spectra and Transmission Electron Microscopy Images
Publisher: American Chemical Society (ACS)
Date: 06-2006
DOI: 10.1021/JP061896I
Abstract: Voltammetric techniques have been introduced to monitor the formation of gold nanoparticles produced via the reaction of the amino acid glycyl-L-tyrosine with Au(III) (bromoaurate) in 0.05 M KOH conditions. The alkaline conditions facilitate amino acid binding to Au(III), inhibit the rate of reduction to Au(0), and provide an excellent supporting electrolyte for voltammetric studies. Data obtained revealed that a range of time-dependent gold solution species are involved in gold nanoparticle formation and that the order in which reagents are mixed is critical to the outcome. Concomitantly with voltammetric measurements, the properties of gold nanoparticles formed are probed by examination of electronic spectra in order to understand how the solution environment present during nanoparticle growth affects the final distribution of the nanoparticles. Images obtained by the ex situ transmission electron microscopy (TEM) technique enable the physical properties of the nanoparticles isolated in the solid state to be assessed. Use of this combination of in situ and ex situ techniques provides a versatile framework for elucidating the details of nanoparticle formation.
Anodized nanoporous WO3 Schottky contact structures for hydrogen and ethanol sensing
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4TA06286H
Abstract: Reversibility of the gas sensor made of a 500 nm thick WO 3 nanoporous film upon exposure to hydrogen gas at 200 °C.
Liquid metal enabled pump
Publisher: Proceedings of the National Academy of Sciences
Date: 18-02-2014
Abstract: The utilization of small-scale pumps is presently h ered by their limited flow rates with respect to the input power or their rather complicated fabrication process. These issues arise as many conventional pumping effects rely on moving elements. Here, we demonstrate the concept of a liquid metal enabled pump with no mechanical parts by simply incorporating droplets of Galinstan. The liquid metal enabled pump creates high flow rates ( ,000 µL/min) at exceptionally low powers ( mW) by electrowetting/deelectrowetting the surface upon application of electric field. The presented pump is both efficient and simple hence, it has the potential to advance the field of actuation in small-scale systems.
Liquid-Metal-Enabled Mechanical-Energy-Induced CO2 Conversion
Publisher: Wiley
Date: 21-10-2022
Abstract: A green carbon capture and conversion technology offering scalability and economic viability for mitigating CO 2 emissions is reported. The technology uses suspensions of gallium liquid metal to reduce CO 2 into carbonaceous solid products and O 2 at near room temperature. The nonpolar nature of the liquid gallium interface allows the solid products to instantaneously exfoliate, hence keeping active sites accessible. The solid co‐contributor of silver–gallium rods ensures a cyclic sustainable process. The overall process relies on mechanical energy as the input, which drives nano‐dimensional triboelectrochemical reactions. When a gallium/silver fluoride mix at 7:1 mass ratio is employed to create the reaction material, 92% efficiency is obtained at a remarkably low input energy of 230 kWh (excluding the energy used for dissolving CO 2 ) for the capture and conversion of a tonne of CO 2 . This green technology presents an economical solution for CO 2 emissions.
Front Cover: Reversible Intercalation of Multivalent Al3+ Ions into Potassium‐Rich Cryptomelane Nanowires for Aqueous Rechargeable Al‐Ion Batteries (ChemSusChem 16/2019)
Publisher: Wiley
Date: 13-08-2019
Chemical reactivity of Ga-based liquid metals with redox active species and its influence on electrochemical processes
Publisher: Elsevier BV
Date: 08-2018
Liquid metal core-shell structures functionalised via mechanical agitation: The example of Field's metal
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA05200C
Abstract: Field's metal particles synthesised by mechanical agitation exhibit peculiar core–shell structure and functionality.
Correlating the Local Electrocatalytic Activity of Amorphous Molybdenum Sulfide Thin Films with Microscopic Composition, Structure, and Porosity
Publisher: American Chemical Society (ACS)
Date: 03-09-2020
Interfacial Engineering with Liquid Metal for Si-Based Hybrid Electrodes in Lithium-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 06-2020
Reversible Intercalation of Multivalent Al3+ Ions into Potassium-Rich Cryptomelane Nanowires for Aqueous Rechargeable Al-Ion Batteries
Publisher: Wiley
Date: 13-08-2019
Related Organisations
University College Cork National University Of Ireland
Location: Ireland
Related Funding Activities
Nanoscale Electrochemical Imaging Of Catalyst Inks For Water Oxidation
Start Date: 2018
End Date: 2020
Funder: Australian Research Council
View Funded ActivityHarnessing Properties Of Liquid Metals For Future Devices
Start Date: 2017
End Date: 2019
Funder: Australian Research Council
View Funded ActivitySurface Modification Of Semiconducting Organic Charge Transfer Complexes With Metal Nanoparticles To Create A New Class Of Multifunctional Materials
Start Date: 2011
End Date: 2015
Funder: Australian Research Council
View Funded ActivityNano-engineered Multi-functional Materials For Catalysis And Sensing By An Integrated Chemical And Electrochemical Approach
Start Date: 2011
End Date: 2013
Funder: Australian Research Council
View Funded ActivityA Highly Sensitive And Selective Nano-engineered Sensor For The Online Monitoring Of Mercury Vapour Emissions From Harsh Industrial Processes
Start Date: 2010
End Date: 2013
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP210100472
Start Date: 12-2021
End Date: 12-2024
Amount: $330,000.00
Funder: Australian Research Council
View Funded ActivityARC Future Fellowships - Grant ID: FT110100760
Start Date: 05-2012
End Date: 12-2017
Amount: $583,528.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP180102869
Start Date: 05-2018
End Date: 05-2024
Amount: $372,716.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP110105125
Start Date: 2011
End Date: 2014
Amount: $320,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP100200859
Start Date: 03-2011
End Date: 08-2014
Amount: $290,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP170102138
Start Date: 05-2017
End Date: 12-2021
Amount: $508,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE210100153
Start Date: 2021
End Date: 12-2021
Amount: $497,264.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Research Hubs - Grant ID: IH190100009
Start Date: 01-2021
End Date: 01-2026
Amount: $3,317,500.00
Funder: Australian Research Council
View Funded Activity