ORCID Profile
0000-0002-6651-4261
Current Organisation
University of New South Wales
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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)
Functional Materials | Energy Generation, Conversion and Storage Engineering | Materials Engineering | Composite and Hybrid Materials | Environmental Technologies | Chemical Engineering | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Adaptive Agents and Intelligent Robotics | Materials engineering | Catalytic Process Engineering | Chemical Engineering Design | Membrane and Separation Technologies | Physical Chemistry (Incl. Structural) | Environmental Engineering | Structural Chemistry and Spectroscopy | Nanomaterials | Functional materials | Environmental Engineering not elsewhere classified | Chemical Engineering not elsewhere classified | Mechanical Engineering | Ceramics | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Electrochemical energy storage and conversion
ANZSRC Socio-Economic Objective (SEO)
Energy Storage (excl. Hydrogen) | Expanding Knowledge in Engineering | Renewable Energy not elsewhere classified | Energy Storage, Distribution and Supply not elsewhere classified | Expanding Knowledge in Technology | Energy Transformation not elsewhere classified | Management of Gaseous Waste from Energy Activities (excl. Greenhouse Gases) | Hydrogen Production from Renewable Energy | Environmental and Natural Resource Evaluation not elsewhere classified | Air Quality not elsewhere classified | Environmentally Sustainable Energy Activities not elsewhere classified | Expanding Knowledge in the Environmental Sciences | Expanding Knowledge in the Chemical Sciences | Management of Solid Waste from Manufacturing Activities | Ceramics |
Related Links
Publications
Anodic chlorine/nitrogen co-doping of reduced graphene oxide films at room temperature
Publisher: Elsevier BV
Date: 08-2012
Binary graphene-based cathode structure for high-performance lithium-sulfur batteries
Publisher: IOP Publishing
Date: 2020
Abstract: Lithium-sulfur (Li-S) batteries are highly appealing for the next-generation of energy storage because of their high energy density and low-cost features. However, the practical implementation of Li-S batteries has been hindered by fast performance degradation of the sulfur cathode, especially at a high cathode loading. Here, we propose a strategic design of binary graphene foam (BGF) as the cathode scaffold, with the incorporation of nitrogen-doped graphene and highly porous graphene. The nitrogen-doped graphene provides chemical adsorption sites for migrating polysulfides, and the highly porous graphene could increase the cathode conductivity and accelerate lithium ion transport. The freestanding foam-like cathode structure further offers a robust, interconnected, conductive framework to promote the redox reaction even at a high cathode loading. Therefore, the Li-S battery with the S/BGF electrode exhibits a high specific areal capacity over 10 mAh cm –2 and good cycling stability over 300 cycles. This approach offers insights into multifunctional electrode structure design, with targeted functions for high-performance Li-S batteries.
Electron-beam writing of deoxygenated micro-patterns on graphene oxide film
Publisher: Elsevier BV
Date: 12-2015
Enhanced Electroactivity of Facet-Controlled Co3 O4 Nanocrystals for Enzymeless Biosensing
Publisher: Elsevier BV
Date: 2016
Synthesis and Electrochemical Property of Boron-Doped Mesoporous Carbon in Supercapacitor
Publisher: American Chemical Society (ACS)
Date: 25-10-2008
DOI: 10.1021/CM801729Y
Spherical Murray-Type Assembly of Co–N–C Nanoparticles as a High-Performance Trifunctional Electrocatalyst
Publisher: American Chemical Society (ACS)
Date: 06-02-2019
Abstract: Future renewable energy conversion requires advanced electrocatalysis technologies for hydrogen production, fuel cells, and metal-air batteries. Highly efficient trifunctional nonprecious electrocatalysts are a critical precious metal replacement for the economically viable electrocatalysis of oxygen reduction and water splitting, both of which are a triphase electrode process. Electrocatalysts with a refined porous structure and active composition beneficial for three-phase reactions are broadly pursued. Herein, a highly promising trifunctional spherical Murray assembly of Co-N-C nanoparticles was derived from low-cost Prussian blue analogues for the oxygen reduction reaction and water splitting. The Murray-type architecture with a tunable porous hierarchy for efficient mass transfer and the combination of a Co-N-C active composition are key for the improved electrocatalytic performance. Acid-leaching produced an optimized Murray-type durable and methanol-tolerant Co-N-C electrocatalyst that achieved an onset potential of 0.94 V [vs reversible hydrogen electrode (RHE)] and a half wave potential of 0.84 V (vs RHE) as well as a large diffusion-limited current density of 5.7 mA cm
A microporous-mesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based Li-S batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CP40808B
Abstract: A microporous-mesoporous carbon with graphitic structure was developed as a matrix for the sulfur cathode of a Li-S cell using a mixed carbonate electrolyte. Sulfur was selectively introduced into the carbon micropores by a melt adsorption-solvent extraction strategy. The micropores act as solvent-restricted reactors for sulfur lithiation that promise long cycle stability. The mesopores remain unfilled and provide an ion migration pathway, while the graphitic structure contributes significantly to low-resistance electron transfer. The selective distribution of sulfur in micropores was characterized by X-ray photoelectron spectroscopy (XPS), nitrogen cryosorption analysis, transmission electron microscopy (TEM), X-ray powder diffraction and Raman spectroscopy. The high-rate stable lithiation-delithiation of the carbon-sulfur cathode was evaluated using galvanostatic charge-discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The cathode is able to operate reversibly over 800 cycles with a 1.8 C discharge-recharge rate. This integration of a micropore reactor, a mesopore ion reservoir, and a graphitic electron conductor represents a generalized strategy to be adopted in research on advanced sulfur cathodes.
Fabrication of graphene/polyaniline composite paper via in situ anodic electropolymerization for high-performance flexible electrode
Publisher: American Chemical Society (ACS)
Date: 02-06-2009
DOI: 10.1021/NN900297M
Abstract: Freestanding and flexible graphene olyaniline composite paper was prepared by an in situ anodic electropolymerization of polyaniline film on graphene paper. This graphene-based composite paper electrode, consisting of graphene olyaniline composite sheets as building blocks, shows a favorable tensile strength of 12.6 MPa and a stable large electrochemical capacitance (233 F g(-1) and 135 F cm(-3) for gravimetric and volumetric capacitances), which outperforms many other currently available carbon-based flexible electrodes and is hence particularly promising for flexible supercapacitors.
The value of mixed conduction for oxygen electroreduction on graphene–chitosan composites
Publisher: Elsevier BV
Date: 07-2014
A Flexible Sulfur‐Graphene‐Polypropylene Separator Integrated Electrode for Advanced Li–S Batteries
Publisher: Wiley
Date: 06-11-2014
Abstract: A flexible Li-S battery based on an integrated structure of sulfur and graphene on a separator is developed. The internal graphene current collector offers a continuous conductive pathway, a modified interface with sulfur, and a good barrier to and an effective reservoir for dissolved polysulfides, consequently improving the capacity and cyclic life of the Li-S battery.
Unlocking high-potential non-persistent radical chemistry for semi-aqueous redox batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8CC09304K
Abstract: Stabilizing non-persistent radical opens the gate to low-cost high-potential cathode for all-organic aqueous redox batteries with fast reversible rate capability.
A nanosized Fe2O3 decorated single-walled carbon nanotube membrane as a high-performance flexible anode for lithium ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM32893C
Nanosize SnO2 confined in the porous shells of carbon cages for kinetically efficient and long-term lithium storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2NR33482H
Abstract: We explore a hybrid material consisting of SnO(2) nanoparticles (NPs) embedded in the porous shells of carbon cages (SnO(2)-PSCC). The hybrid material exhibits improved kinetics of lithiation-delithiation and high reversible capacity, and excellent cyclic stability without capacity loss over 100 cycles at 500 mA g(-1) with a coulombic efficiency close to 100% after the initial cycle. This can be ascribed to the high electrical conductivity, the hierarchical porosity and the confinement effect of the PSCC on the volume change of SnO(2) NPs. The material has a large reversible capacity of 460 mA h g(-1) at a high current density of 5 A g(-1) due to a short ion diffusion length in the bulk and large number of inter-pore ion transport channels. These results provide insight into improving the lithium storage performance of SnO(2) by facilitating the reaction kinetics and indicate that this hybrid material has great potential for use in high-rate and durable lithium ion batteries.
Electron field emission of a nitrogen-doped TiO2nanotube array
Publisher: IOP Publishing
Date: 06-12-2007
DOI: 10.1088/0957-4484/19/02/025606
Abstract: A nitrogen-doped titania nanotube array vertically aligned on a titanium substrate exhibits efficient electron field emission. Such a titania nanotube array shows very good stability at high field emission current (fluctuation <3% at field emission current of 160 µA within 4 h) and low turn-on and threshold fields (11.2 and 24.4 V µm(-1), respectively) because of the coexistence of doped nitrogen and concomitant oxygen vacancies in titania nanotubes. This work demonstrates the possibility of converting pure titania nanotubes without field emission into a favorable and efficient one through the introduction of acceptor states and donor states both above the valence band maximum and below the conduction band minimum in the band gap of titania by the doped nitrogen and concomitant oxygen vacancies, respectively. Application of this doping concept to other transition metal oxides can be expected to broaden the scope of field emission materials.
Reduction-induced surface amorphization enhances the oxygen evolution activity in Co3O4
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA00995B
Abstract: Modifying crystalline Co 3 O 4 by thermal H 2 annealing and air exposure produced an amorphous surface layer consisting of mixed hydrated cobalt hydroxide/carbonate species and remarkably enhanced the oxygen evolution activity.
Solution phase synthesis of halogenated graphene and the electrocatalytic activity for oxygen reduction reaction
Publisher: Elsevier BV
Date: 06-2014
Core/Shell NiFe Nanoalloy with a Discrete N-doped Graphitic Carbon Cover for Enhanced Water Oxidation
Publisher: Wiley
Date: 25-01-2018
Anchoring Hydrous RuO2 on Graphene Sheets for High‐Performance Electrochemical Capacitors
Publisher: Wiley
Date: 23-08-2010
A comparative study on layered cobalt hydroxides in water oxidation
Publisher: Wiley
Date: 05-2016
DOI: 10.1002/APJ.2005
Electrochemical stability of graphene cathode for high‐voltage lithium ion capacitors
Publisher: Wiley
Date: 27-04-2016
DOI: 10.1002/APJ.2001
Field Emission and Cathodoluminescence of ZnS Hexagonal Pyramids of Zinc Blende Structured Single Crystals
Publisher: Wiley
Date: 02-02-2009
High-performance lithium–sulfur batteries enabled by regulating Li2S deposition
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CP03030B
Abstract: This perspective highlights the significance of regulating Li 2 S deposition and the related methods in improving the performance of lithium–sulfur batteries.
Evolution of the effect of sulfur confinement in graphene-based porous carbons for use in Li–S batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR08839A
Abstract: A controllable drying strategy is proposed for the precise and non-destructive control over the structure of a 3D graphene assembly. Such an assembly is used as a model carbon material to investigate the pore structure-dependent shuttle effect and cycling performance of the cathode of a Li-S battery.
Introducing Stacking Faults into Three-Dimensional Branched Nickel Nanoparticles for Improved Catalytic Activity.
Publisher: American Chemical Society (ACS)
Date: 17-06-2022
DOI: 10.1021/JACS.2C04911
Abstract: Creating high surface area nanocatalysts that contain stacking faults is a promising strategy to improve catalytic activity. Stacking faults can tune the reactivity of the active sites, leading to improved catalytic performance. The formation of branched metal nanoparticles with control of the stacking fault density is synthetically challenging. In this work, we demonstrate that varying the branch width by altering the size of the seed that the branch grows off is an effective method to precisely tune the stacking fault density in branched Ni nanoparticles. A high density of stacking faults across the Ni branches was found to lower the energy barrier for Ni
Hybrid Graphene and Graphitic Carbon Nitride Nanocomposite: Gap Opening, Electron–Hole Puddle, Interfacial Charge Transfer, and Enhanced Visible Light Response
Publisher: American Chemical Society (ACS)
Date: 27-02-2012
DOI: 10.1021/JA211637P
Abstract: Opening up a band gap and finding a suitable substrate material are two big challenges for building graphene-based nanodevices. Using state-of-the-art hybrid density functional theory incorporating long-range dispersion corrections, we investigate the interface between optically active graphitic carbon nitride (g-C(3)N(4)) and electronically active graphene. We find an inhomogeneous planar substrate (g-C(3)N(4)) promotes electron-rich and hole-rich regions, i.e., forming a well-defined electron-hole puddle, on the supported graphene layer. The composite displays significant charge transfer from graphene to the g-C(3)N(4) substrate, which alters the electronic properties of both components. In particular, the strong electronic coupling at the graphene/g-C(3)N(4) interface opens a 70 meV gap in g-C(3)N(4)-supported graphene, a feature that can potentially allow overcoming the graphene's band gap hurdle in constructing field effect transistors. Additionally, the 2-D planar structure of g-C(3)N(4) is free of dangling bonds, providing an ideal substrate for graphene to sit on. Furthermore, when compared to a pure g-C(3)N(4) monolayer, the hybrid graphene/g-C(3)N(4) complex displays an enhanced optical absorption in the visible region, a promising feature for novel photovoltaic and photocatalytic applications.
Evidence for Fast Lithium-Ion Diffusion and Charge-Transfer Reactions in Amorphous TiO x Nanotubes: Insights for High-Rate Electrochemical Energy Storage
Publisher: American Chemical Society (ACS)
Date: 21-11-2018
Abstract: The charge-storage kinetics of amorphous TiO
Hierarchical porous nickel oxide and carbon as electrode materials for asymmetric supercapacitor
Publisher: Elsevier BV
Date: 12-2008
Epitaxial Growth of Au–Pt–Ni Nanorods for Direct High Selectivity H2 O2 Production
Publisher: Wiley
Date: 17-10-2016
Abstract: Au-Ni core-shell nanorods (NRs) and Au-Pt-Ni core-sandwich-shell NRs are synthesized and exhibit high activity for selective H
Evolution of the electrochemical interface in sodium ion batteries with ether electrolytes
Publisher: Springer Science and Business Media LLC
Date: 13-02-2019
DOI: 10.1038/S41467-019-08506-5
Abstract: Ether based electrolytes have surfaced as alternatives to conventional carbonates allowing for enhanced electrochemical performance of sodium-ion batteries however, the primary source of the improvement remains poorly understood. Here we show that coupling titanium dioxide and other anode materials with diglyme does enable higher efficiency and reversible capacity than those for the combination involving ester electrolytes. Importantly, the electrolyte dependent performance is revealed to be the result of the different structural evolution induced by a varied sodiation depth. A suit of characterizations show that the energy barrier to charge transfer at the interface between electrolyte and electrode is the factor that dominates the interfacial electrochemical characteristics and therefore the energy storage properties. Our study proposes a reliable parameter to assess the intricate sodiation dynamics in sodium-ion batteries and could guide the design of aprotic electrolytes for next generation rechargeable batteries.
Ternary MnO/CoMn alloy@N-doped graphitic composites derived from a bi-metallic pigment as bi-functional electrocatalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA08016C
Abstract: A composite comprising a CoMn alloy coated with N-doped graphitic carbon (CoMn@NC) and MnO was fabricated by a single-step pyrolysis of a Prussian blue analogue, showing superior activity and stability for both the ORR and OER.
Solar Redox Flow Batteries: Mechanism, Design, and Measurement
Publisher: Wiley
Date: 10-06-2018
Wurtzite P-Doped GaN Triangular Microtubes as Field Emitters
Publisher: American Chemical Society (ACS)
Date: 07-05-2010
DOI: 10.1021/JP100689S
Carbon-sulfur composites for Li-S batteries: Status and prospects
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11045A
A flexible nanostructured sulphur-carbon nanotube cathode with high rate performance for Li-S batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2EE22294A
3D Aperiodic Hierarchical Porous Graphitic Carbon Material for High‐Rate Electrochemical Capacitive Energy Storage
Publisher: Wiley
Date: 19-12-2007
Ligand‐Promoted Cooperative Electrochemical Oxidation of Bio‐Alcohol on Distorted Cobalt Hydroxides for Bio‐Hydrogen Extraction
Publisher: Wiley
Date: 13-05-2021
Abstract: Hydrogen is increasingly viewed as a game‐changer in the clean energy sector. Renewable hydrogen production from water is industrialized by integrating water electrolysis and renewable electricity, but the current cost of water‐born hydrogen remains high though. An ideal scenario would be to produce value‐added chemicals along with hydrogen so the cost can be partially offset. Herein, facilitated bio‐hydrogen extraction and biomass‐derived chemical formation from sugar‐derived 5‐hydroxymethyfurfural (HMF) were achieved via the in‐situ transformation of cobalt‐bound electrocatalysts. The cyanide‐bound cobalt hydroxide exhibited a low voltage at 1.55 V at 10 mA cm −2 for bio‐hydrogen production, compared with an iridium catalyst (1.75 V). The interaction between the biomass intermediate and the cyanide ligand is suggested to be responsible for the improved activity.
Heterogeneous nanocarbon materials for oxygen reduction reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3EE43463J
Revisiting oxygen reduction reaction on oxidized and unzipped carbon nanotubes
Publisher: Elsevier BV
Date: 2015
Metal–Ligand Complexes as Molecular Metal-Ion Reservoirs for Highly Promoted Growth of β-Co(OH)2 Microplates
Publisher: American Chemical Society (ACS)
Date: 16-12-2016
Oxygen Electrocatalysis at MnIII–Ox–C Hybrid Heterojunction: An Electronic Synergy or Cooperative Catalysis?
Publisher: American Chemical Society (ACS)
Date: 30-11-2019
Abstract: The interface at the metal oxide-carbon hybrid heterojunction is the source to the well-known "synergistic effect" in catalysis. Understanding the structure-function properties is key for designing more advanced catalyst-support systems. Using a model Mn
Micro-Macroscopic Coupled Electrode Architecture for High-Energy-Density Lithium-Sulfur Batteries
Publisher: American Chemical Society (ACS)
Date: 09-09-2019
Nanoarchitectonics on Z-scheme and Mott–Schottky heterostructure for photocatalytic water oxidation via dual-cascade charge-transfer pathways
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NA00182B
Abstract: A face-contact C 3 N 4 /m-BiVO 4 /rGO ternary composite was constructed for excessive surface recombination during water oxidation. Spatial separation of electron–hole pairs occurs, and strong redox potentials are maintained by the Z-scheme electron transfer.
The examination of graphene oxide for rechargeable lithium storage as a novel cathode material
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA01658G
Amorphous TiO2nanotube arrays for low-temperature oxygen sensors
Publisher: IOP Publishing
Date: 20-08-2008
DOI: 10.1088/0957-4484/19/40/405504
Abstract: Titania nanotube arrays (TNTA) were synthesized on a titanium substrate using anodic oxidation in an electrolyte containing ammonium fluoride and evaluated for low-temperature oxygen sensing. Their sensing properties were tested at different temperatures (50, 100, 150, 200, 250 and 300 °C) when exposed to various oxygen concentrations. The as-prepared TNTA are amorphous and exhibit much higher carrier concentration than that of annealed TNTA. Such amorphous TNTA show much higher sensitivity than that of annealed TNTA, SrTiO(3) and Ga(2)O(3) sensors. This s le demonstrates the lowest detectable oxygen concentration of 200 ppm, excellent recovery and good linear correlation at 100 °C. These results indicate that TNTA are indeed very attractive oxygen-sensing materials.
In Situ Sulfurized Carbon-Confined Cobalt for Long-Life Mg/S Batteries
Publisher: American Chemical Society (ACS)
Date: 10-01-2020
Armoring Graphene Cathodes for High‐Rate and Long‐Life Lithium Ion Supercapacitors
Publisher: Wiley
Date: 19-01-2016
Dynamic single-site polysulfide immobilization in long-range disorder Cu-MOFs
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CC04001K
Abstract: The dynamic structural transformation of Cu-MOFs during cell discharge and recharge involves irreversible frame-work amorphization and interconvertible single copper cations.
Light, Catalyst, Activation: Boosting Catalytic Oxygen Activation Using a Light Pretreatment Approach
Publisher: American Chemical Society (ACS)
Date: 24-04-2017
Author Correction: Evolution of the electrochemical interface in sodium ion batteries with ether electrolytes
Publisher: Springer Science and Business Media LLC
Date: 13-03-2019
DOI: 10.1038/S41467-019-09129-6
Abstract: The original version of this Article incorrectly omitted an affiliation of Kaikai Li: ‘Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China’. This has been corrected in both the PDF and HTML versions of the Article.
Electroactive cellulose-supported graphene oxide interlayers for Li-S batteries
Publisher: Elsevier BV
Date: 11-2015
A high-density graphene–sulfur assembly: a promising cathode for compact Li–S batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4NR06863G
Abstract: A high-density graphene–sulfur cathode is fabricated for high volumetric capacity Li–S batteries, and the potential of the cathode for compact energy storage is demonstrated.
A water-dielectric capacitor using hydrated graphene oxide film
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM34476A
Comparison of the rate capability of nanostructured amorphous and anatase TiO2for lithium insertion using anodic TiO2nanotube arrays
Publisher: IOP Publishing
Date: 13-05-2009
DOI: 10.1088/0957-4484/20/22/225701
Abstract: Nanostructured amorphous and anatase TiO2 are both considered as high rate Li-insertion/extraction electrode materials. To clarify which phase is more desirable for lithium ion batteries with both high power and high density, we compare the electrochemical properties of anatase and amorphous TiO2 by using anodic TiO2 nanotube arrays (ATNTAs) as electrodes. With the same morphological features, the rate capacity of nanostructured amorphous TiO2 is higher than that of nanostructured anatase TiO2 due to the higher Li-diffusion coefficient of amorphous TiO2 as proved by the electrochemical impedance spectra of an amorphous and an anatase ATNTA electrode. The electrochemical impedance spectra also prove that the electronic conductivity of amorphous TiO2 is lower than that of anatase TiO2. These results are helpful in the structural and componential design of all TiO2 mesoporous structures as anode material in lithium ion batteries. Moreover, all the advantages of the amorphous ATNTA electrode including high rate capacity, desirable cycling performance and the simplicity of its fabrication process indicate that amorphous ATNTA is potentially useful as the anode for lithium ion batteries with both high power and high energy density.
Unravelling the Structure of Electrocatalytically Active Fe–N Complexes in Carbon for the Oxygen Reduction Reaction
Publisher: Wiley
Date: 12-08-2014
Abstract: Non-precious Fe/N co-modified carbon electrocatalysts have attracted great attention due to their high activity and stability in oxygen reduction reaction (ORR). Compared to iron-free N-doped carbon electrocatalysts, Fe/N-modified electrocatalysts show four-electron selectivity with better activity in acid electrolytes. This is believed relevant to the unique Fe-N complexes, however, the Fe-N structure remains unknown. We used o,m,p-phenylenediamine as nitrogen precursors to tailor the Fe-N structures in heterogeneous electrocatalysts which contain FeS and Fe3 C phases. The electrocatalysts have been operated for 5000 cycles with a small 39 mV shift in half-wave potential. By combining advanced electron microscopy and Mössbauer spectroscopy, we have identified the electrocatalytically active Fe-N6 complexes (FeN6, [Fe(III)(porphyrin)(pyridine)2]). We expect the understanding of the FeN6 structure will pave the way towards new advanced Fe-N based electrocatalysts.
Fabrication and supercapacitive properties of a thick electrode of carbon nanotube–RuO2 core–shell hybrid material with a high RuO2 loading
Publisher: Elsevier BV
Date: 11-2013
Atomic insights of electronic states engineering of GaN nanowires by Cu cation substitution for highly efficient lithium ion battery
Publisher: Elsevier BV
Date: 04-2022
Hollow carbon cage with nanocapsules of graphitic shell/nickel core as an anode material for high rate lithium ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM31421E
Rationalized design of hyperbranched trans-scale graphene arrays for enduring high-energy lithium metal batteries
Publisher: American Association for the Advancement of Science (AAAS)
Date: 26-08-2022
Abstract: Lithium (Li) metal anode have shown exceptional potential for high-energy batteries. However, practical cell-level energy density of Li metal batteries is usually limited by the low areal capacity ( mAh cm −2 ) because of the accelerated degradation of high–areal capacity Li metal anodes upon cycling. Here, we report the design of hyperbranched vertical arrays of defective graphene for enduring deep Li cycling at practical levels of areal capacity ( mAh cm −2 ). Such atomic-to-macroscopic trans-scale design is rationalized by quantifying the degradation dynamics of Li metal anodes. High-energy Li metal cells are prototyped under realistic conditions with high cathode capacity ( mAh cm −2 ), low negative-to-positive electrode capacity ratio (1:1), and low electrolyte-to-capacity ratio (5 g Ah −1 ), which shed light on a promising move toward practical Li metal batteries.
Ultrahigh rate sodium ion storage with nitrogen-doped expanded graphite oxide in ether-based electrolyte
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA09631C
Abstract: Nitrogen-doped graphite oxide can serve as anode material for Na-ion battery with high initial coulombic efficiency and excellent rate properties.
High yield electrooxidation of 5-hydroxymethyl furfural catalysed by unsaturated metal sites in CoFe Prussian Blue Analogue films
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1GC01208H
Abstract: Unsaturated Co metal sites in CoFe Prussian blue analogues are introduced by pulse electrodeposition on Ni foam. The PBA electrode achieved 94% yield of 2,5-furandicarboxylic acid from 5-hydroxymethylfurfural at 1.43 V vs . RHE.
High-Performance Microsupercapacitors Based on Bioinspired Graphene Microfibers
Publisher: American Chemical Society (ACS)
Date: 07-03-2018
Abstract: The miniaturization of portable electronic devices has fueled the development of microsupercapacitors that hold great potential to complement or even replace microbatteries and electrolytic capacitors. In spite of recent developments taking advantage of printing and lithography, it remains a great challenge to attain a high energy density without sacrificing the power density. Herein, a new protocol mimicking the spider's spinning process is developed to create highly oriented microfibers from graphene-based composites via a purpose-designed microfluidic chip. The orientation provides the microfibers with an electrical conductivity of ∼3 × 10
Order of Activity of Nitrogen, Iron Oxide, and FeNx Complexes towards Oxygen Reduction in Alkaline Medium
Publisher: Wiley
Date: 17-11-2015
Abstract: In alkaline medium, it seems that both metal-free and iron-containing carbon-based catalysts, such as nitrogen-doped nanocarbon materials, FeOx -doped carbon, and Fe/N/C catalysts, are active for the oxygen reduction reaction (ORR). However, the order of activity of these different active compositions has not been clearly determined. Herein, we synthesized nitrogen-doped carbon black (NCB), Fe3 O4 /CB, Fe3 O4 /NCB, and FeN4 /CB. Through the systematic study of the ORR catalytic activity of these four catalysts in alkaline solution, we confirmed the difference in the catalytic activity and catalytic mechanism for nitrogen, iron oxides, and Fe-N complexes, respectively. In metal-free NCB, nitrogen can improve the ORR catalytic activity with a four-electron pathway. Fe3 O4 /CB catalyst did not exhibit improved activity over that of NCB owing to the poor conductivity and spinel structure of Fe3 O4 . However, FeN4 coordination compounds as the active sites showed excellent ORR catalytic activity.
Materials, Chemistry, and Simulation for Future Energy Technology
Publisher: Wiley
Date: 02-09-2015
Abstract: Special Issue: The Future of Energy. The science and engineering of clean energy now is becoming a multidisciplinary area, typically when new materials, chemistry, or mechanisms are met. "Trial and error" is the past. Exploration of new concepts for future clean energy can be accomplished through computer-aided materials design and reaction simulation, thanks to innovations in information technologies. This special issue, a fruit of the Energy Future Conference organized by UNSW Australia, has compiled some excellent ex les of such approaches.
Synthesis and dye separation performance of ferromagnetic hierarchical porous carbon
Publisher: Elsevier BV
Date: 10-2008
The effect of carbon particle morphology on the electrochemical properties of nanocarbon/polyaniline composites in supercapacitors
Publisher: Elsevier BV
Date: 06-2011
Versatile electrocatalytic processes realized by Ni, Co and Fe alloyed core coordinated carbon shells
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA01723B
Abstract: Through encapsulation of Ni, Co and Fe alloyed core inside graphitic carbon shells, a versatile composite catalyst can be obtained that demonstrates excellent activity towards electrochemical energy conversion reactions.
Graphene-Based Planar Microsupercapacitors: Recent Advances and Future Challenges
Publisher: Wiley
Date: 18-10-2019
A holistic green system coupling hydrogen production with wastewater valorisation
Publisher: Wiley
Date: 28-06-2022
DOI: 10.1002/EOM2.12254
Abstract: Green hydrogen represents a critical underpinning technology for achieving carbon neutrality. Although researchers often fixate on its energy inputs, a truly ‘green’ hydrogen production process would also be sustainable in terms of water and materials inputs. To address this holistic challenge, we demonstrate a new green hydrogen production system which can utilize secondary wastewater as the input (preserving scarce fresh water supplies for drinking and sanitation). The enabling feature of the proposed system is a self‐grown bifunctional CoNi electrode which consists of ultrathin, spontaneously deposited CoNi nanosheets on a three‐dimensional nickel foam. As such, a green synthesis process was developed using an immersion procedure at room‐temperature with zero net energy input. Testing revealed that the synthesized CoNi electrodes can reach a current density of 10 mA cm −2 at a small overpotential of 197 mV for the hydrogen evolution reaction and 315 mV for the oxygen evolution reaction in alkalified wastewater. The values are ~16.5% and ~6.5% smaller than that from precious catalysts (20 wt% Pt/C and RuO 2 , respectively). Importantly, this CoNi catalyst offers outstanding durability for overall wastewater splitting. A prototype solar‐energy‐powered rooftop wastewater splitting system was constructed and can produce more than 100 L hydrogen on a sunny day in Sydney, Australia. Taken together, these results indicate that it is promising to unlock holistically green routes for hydrogen production by wastewater uplifting with regards to water, energy, and materials synthesis. image
Design Rationale and Device Configuration of Lithium‐Ion Capacitors
Publisher: Wiley
Date: 20-05-2022
Abstract: Lithium‐ion capacitors (LICs) are a game‐changer for high‐performance electrochemical energy storage technologies. Despite the many recent reviews on the materials development for LICs, the design principles for the LICs configuration, the possible development roadmap from academy to industry has not been adequately discussed. Systematic understanding of device development is the foundation to more efficient utilization of advanced LICs materials. This review focuses on the principle of the recent configurations of LICs, the device design rationales, and new prelithiation techniques that are an integral part in LIC design. The authors also comment on the new generation multifunctional LICs that are capable of meeting the emerging applications in flexible electronics and other modern technologies. Finally, the status of LICs is presented and several key take‐home messages about minimizing the gaps between academic and industry requirements are proposed.
Confined SnO2 quantum-dot clusters in graphene sheets as high-performance anodes for lithium-ion batteries
Publisher: Springer Science and Business Media LLC
Date: 16-05-2016
DOI: 10.1038/SREP25829
Abstract: Construction of metal oxide nanoparticles as anodes is of special interest for next-generation lithium-ion batteries. The main challenge lies in their rapid capacity fading caused by the structural degradation and instability of solid-electrolyte interphase (SEI) layer during charge/discharge process. Herein, we address these problems by constructing a novel-structured SnO 2 -based anode. The novel structure consists of mesoporous clusters of SnO 2 quantum dots (SnO 2 QDs), which are wrapped with reduced graphene oxide (RGO) sheets. The mesopores inside the clusters provide enough room for the expansion and contraction of SnO 2 QDs during charge/discharge process while the integral structure of the clusters can be maintained. The wrapping RGO sheets act as electrolyte barrier and conductive reinforcement. When used as an anode, the resultant composite (MQDC-SnO 2 /RGO) shows an extremely high reversible capacity of 924 mAh g −1 after 200 cycles at 100 mA g −1 , superior capacity retention (96%), and outstanding rate performance (505 mAh g −1 after 1000 cycles at 1000 mA g −1 ). Importantly, the materials can be easily scaled up under mild conditions. Our findings pave a new way for the development of metal oxide towards enhanced lithium storage performance.
Low-potential solid-solid interfacial charging on layered polyaniline anode for high voltage pseudocapacitive intercalation Li-ion supercapacitors
Publisher: Elsevier BV
Date: 2023
A vertical graphene enhanced Zn–MnO2 flexible battery towards wearable electronic devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA08775K
Abstract: A multilayer structured cathode for zinc ion batteries is created by using vertical graphene nano-maze to hold MnO 2 and encapsulating with an ionic conductive PEDOT:PSS layer. The new electrode exhibits exceptional capacity and cycle performance.
Nanosized‐Zinc‐Mediated Self‐Gelation of Graphene Oxide under Ambient Conditions
Publisher: Wiley
Date: 30-05-2018
Abstract: Self-assembly of 3D reduced graphene oxide (rGO) sponges has received increasing attention in recent years. By far, chemical reduction, hydrothermal treatment, template-directed chemical vapor deposition, and electrodeposition are the typical methods. Herein, the utilization of zinc nanoparticles as a reducing agent to fabricate 3D rGO sponges is reported. The relative negative standard electrode potential of zinc to graphene oxide (GO) allowed the spontaneous formation of the rGO-Zn hydrogel. Zinc-free 3D rGO sponges were recovered by acid leaching of the zinc species and freeze-drying. This room-temperature electroless gelation is dependent on pH. The structure and electrochemical performance of the as-synthesized rGO sponges were determined by the mass ratio of Zn to GO. Comprehensive physical and chemical characterizations were utilized to understand the 3D structure evolution of the rGO sponges. The rGO sponge, with an optimized texture, showed high capacitance and good stability in 1 m H
Synthesis of Tin (II or IV) Oxide Coated Multiwall Carbon Nanotubes with Controlled Morphology
Publisher: American Chemical Society (ACS)
Date: 21-03-2008
DOI: 10.1021/JP077261G
Effects of Surface Pretreatment of Glassy Carbon on the Electrochemical Behavior of V(IV)/V(V) Redox Reaction
Publisher: The Electrochemical Society
Date: 2016
DOI: 10.1149/2.0261607JES
Functional Electrocatalysts Derived from Prussian Blue and its Analogues for Metal‐Air Batteries: Progress and Prospects
Publisher: Wiley
Date: 05-02-2019
Hierarchical Design of Porous Carbon Materialsfor Supercapacitors
Publisher: Wiley
Date: 26-03-2014
Safe and high-rate supercapacitors based on an “acetonitrile/water in salt” hybrid electrolyte
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8EE01040D
Abstract: An “acetonitrile/water in salt” electrolyte with non-flammability, high conductivity, a high stability window and a wide applicable temperature range enables high-performance supercapacitors.
Carbon for the oxygen reduction reaction: a defect mechanism
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02229K
Abstract: A new defect mechanism for the ORR was proposed based on the theoretical calculations and our experimental results.
Porous yet dense metal-free electro-materials for compact energy storage
Publisher: Springer Science and Business Media LLC
Date: 2016
Recent advancements in g-C3N4-based photocatalysts for photocatalytic CO2 reduction: a mini review
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA05779G
Abstract: g-C 3 N 4 -based photocatalysts for photocatalytic CO 2 reduction.
Nitrogen-Doped Carbon Monolith for Alkaline Supercapacitors and Understanding Nitrogen-Induced Redox Transitions
Publisher: Wiley
Date: 14-03-2012
Abstract: A nitrogen-doped porous carbon monolith was synthesized as a pseudo-capacitive electrode for use in alkaline supercapacitors. Ammonia-assisted carbonization was used to dope the surface with nitrogen heteroatoms in a way that replaced carbon atoms but kept the oxygen content constant. Ammonia treatment expanded the micropore size-distributions and increased the specific surface area from 383 m(2) g(-1) to 679 m(2) g(-1). The nitrogen-containing porous carbon material showed a higher capacitance (246 F g(-1)) in comparison with the nitrogen-free one (186 F g(-1)). Ex situ electrochemical spectroscopy was used to investigate the evolution of the nitrogen-containing functional groups on the surface of the N-doped carbon electrodes in a three-electrode cell. In addition, first-principles calculations were explored regarding the electronic structures of different nitrogen groups to determine their relative redox potentials. We proposed possible redox reaction pathways based on the calculated redox affinity of different groups and surface analysis, which involved the reversible attachment/detachment of hydroxy groups between pyridone and pyridine. The oxidation of nitrogen atoms in pyridine was also suggested as a possible reaction pathway.
Energy Storing Plant Stem with Cytocompatibility for Supercapacitor Electrode
Publisher: Wiley
Date: 23-09-2021
Abstract: Endowing natural biological objects, such as plants or their parts, with non‐native and targeted electroactivity is an appealing challenge in nano‐biotechnology, which if addressed will circumvent the biomass carbonization and promote the emission‐free transformation of raw bioresources for green energy. Here, a general concept to produce supercapacitor electrodes from plant stems is reported, which exhibit promising electroactivity and cytocompatibility. The core innovation is to apply a conformal electroactive coating onto the surfaces of hyperbranched channels of plant stem by interfacial self‐assembly. The electroactive plant stem can be employed as a functional supercapacitor electrode, the capacitance of which is up to 2.35 F. Furthermore, more than 98% cell viability is well maintained after the plant stem electrode is incubated with MCF‐7 cells for 72 h, and even after 100 discharge–recharge cycles, suggesting this plant stem electrode has excellent cytocompatibility and cycling stability. This energy storing plant stem gives rise to new opportunities for integrating natural bioresources with artificial electroactive nanomaterials for cytocompatible energy storage devices.
Effect of Pore Packing Defects in 2-D Ordered Mesoporous Carbons on Ionic Transport
Publisher: American Chemical Society (ACS)
Date: 08-04-2006
DOI: 10.1021/JP0572683
Abstract: Ordered mesoporous materials show great importance in energy, environmental, and chemical engineering. The diffusion of guest species in mesoporous networks plays an important role in these applications, especially for energy storage, such as supercapacitors based on ordered mesoporous carbons (OMCs). The ion diffusion behavior in two different 2-D hexagonal OMCs was investigated by using cyclic voltametry and electrochemical impedance spectroscopy. In addition, transmission electron microscopy, small-angle X-ray diffraction, and nitrogen cryosorption methods were used to study the pore structure variations of these two OMCs. It was found that, for the OMC with defective pore channels (termed as pore packing defects), the gravimetric capacitance was greatly decayed when the voltage scan rate was increased. The experimental results suggest that, for the ion diffusion in 2-D hexagonal OMCs with similar mesopore size distribution, the pore packing defect is a dominant dynamic factor.
Nanofluidic voidless electrode for electrochemical capacitance enhancement in gel electrolyte
Publisher: Springer Science and Business Media LLC
Date: 17-09-0100
DOI: 10.1038/S41467-021-25817-8
Abstract: Porous electrodes with extraordinary capacitances in liquid electrolytes are oftentimes incompetent when gel electrolyte is applied because of the escalating ion diffusion limitations brought by the difficulties of infilling the pores of electrode with gels. As a result, porous electrodes usually exhibit lower capacitance in gel electrolytes than that in liquid electrolytes. Benefiting from the swift ion transport in intrinsic hydrated nanochannels, the electrochemical capacitance of the nanofluidic voidless electrode (5.56% porosity) is nearly equal in gel and liquid electrolytes with a difference of ~1.8%. In gel electrolyte, the areal capacitance reaches 8.94 F cm −2 with a gravimetric capacitance of 178.8 F g −1 and a volumetric capacitance of 321.8 F cm −3 . The findings are valuable to solid-state electrochemical energy storage technologies that require high-efficiency charge transport.
Hydrogen-bonded quasi-layered polypyrrole-tungstate complex with exceptional electrochemical capacitance over 25000 cycles
Publisher: Elsevier BV
Date: 06-2022
Enhanced electrochemical sensitivity of PtRh electrodes coated with nitrogen-doped graphene
Publisher: Elsevier BV
Date: 10-2010
In Situ Assembly of Multi-Sheeted Buckybooks from Single-Walled Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 27-02-2009
DOI: 10.1021/NN800852N
Abstract: We report a simple approach for the direct and nondestructive assembly of multi-sheeted single-walled carbon nanotube book-like macrostructures (buckybooks) with good control of the nanotube diameter, the sheet packing density, and the book thickness during the floating catalytic growth process. The promise of such buckybooks is highlighted by demonstrating their high capacitance and high-efficiency molecular separation by directly using them as a binder-free electrode and as a filter, respectively. Our approach also provides a flexible and reliable way to easily assemble various other types of nanotubes into book-like or even more sophisticated sandwich-like hybrid macrostructures, realizing the shape-engineering of one-dimensional nanostructures to macroscopic well-defined architectures for various applications.
A review on system and materials for aqueous flexible metal–air batteries
Publisher: Wiley
Date: 29-11-2023
DOI: 10.1002/CEY2.284
Abstract: The exploration of aqueous flexible metal–air batteries with high energy density and durability has attracted many research efforts with the demand for portable and wearable electronic devices. Aqueous flexible metal–air batteries feature Earth‐abundant materials, environmental friendliness, and operational safety. Each part of one metal–air battery can significantly affect the overall performance. This review starts with the fundamental working principles and the basic battery configurations and then highlights on the common issues and the recent advances in designing high‐performance metal electrodes, solid‐state electrolytes, and air electrodes. Bifunctional oxygen electrocatalysts with high activity and long‐term stability for constructing efficient air electrodes in flexible metal–air batteries are summarized including metal‐free carbon‐based materials and nonprecious Co/Fe‐based materials (alloys, metal oxides, metal sulfites, metal phosphates, metal nitrates, single‐site metal–nitrogen–carbon materials, and composites). Finally, a perspective is provided on the existing challenges and possible future research directions in optimizing the performance and lifetime of the flexible aqueous solid‐state metal–air batteries.
Oxygen Bridges between NiO Nanosheets and Graphene for Improvement of Lithium Storage
Publisher: American Chemical Society (ACS)
Date: 23-03-2012
DOI: 10.1021/NN300098M
Abstract: Graphene has been widely used to dramatically improve the capacity, rate capability, and cycling performance of nearly any electrode material for batteries. However, the binding between graphene and these electrode materials has not been clearly elucidated. Here we report oxygen bridges between graphene with oxygen functional groups and NiO from analysis by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy and confirm the conformation of oxygen bridges by the first-principles calculations. We found that NiO nanosheets (NiO NSs) are bonded strongly to graphene through oxygen bridges. The oxygen bridges mainly originate from the pinning of hydroxyl/epoxy groups from graphene on the Ni atoms of NiO NSs. The calculated adsorption energies (1.37 and 1.84 eV for graphene with hydroxyl and epoxy) of a Ni adatom on oxygenated graphene by binding with oxygen are comparable with that on graphene (1.26 eV). However, the calculated diffusion barriers of the Ni adatom on the oxygenated graphene surface (2.23 and 1.69 eV for graphene with hydroxyl and epoxy) are much larger than that on the graphene (0.19 eV). Therefore, the NiO NS is anchored strongly on the graphene through a C-O-Ni bridge, which allows a high reversible capacity and excellent rate performance. The easy binding/difficult dissociating characteristic of Ni adatoms on the oxygenated graphene facilitates fast electron hopping from graphene to NiO and thus the reversible lithiation and delithiation of NiO. We believe that the understanding of this oxygen bridge between graphene and NiO will lead to the development of other high-performance electrode materials.
Refilling Nitrogen to Oxygen Vacancies in Ultrafine Tungsten Oxide Clusters for Superior Lithium Storage
Publisher: Wiley
Date: 16-08-2019
Mesopore-Aspect-Ratio Dependence of Ion Transport in Rodtype Ordered Mesoporous Carbon
Publisher: American Chemical Society (ACS)
Date: 06-06-2008
DOI: 10.1021/JP800173Z
Redox-mediated proton transport of two-dimensional polyaniline-based nanochannels for fast capacitive performance
Publisher: Wiley
Date: 2022
Abstract: Two‐dimensional (2D) materials are being increasingly exploited for ion transport and storage under nanoconfinement. Here we demonstrate distinct ion transport behavior upon potential‐induced redox reaction in 2D tungstate anion cross‐linked polyaniline (TALP) electrode. It is found that, in the neutral electrolyte, SO 4 2− ion serves as the main charge carrier in 2D polyaniline backbone when the electrical double layer charging dominates. While in an acidic electrolyte, proton transport in TALP turns to be the dominant ion behavior that is associated with the proton‐promoting surface redox processes. Moreover, higher capacitance along with better capacitive retention at a high rate is also demonstrated for TALP electrode in acidic electrolyte compared with that in the neutral environment. The results show that 2D nanoionics can be manipulated by applying redox‐active materials to build the nanochannels that allow the regulation of surface charge and chemistry with potential‐specific redox reactions.
Synergetic Nanoarchitectonics of Defects and Cocatalysts in Oxygen-Vacancy-Rich BiVO4/reduced graphene oxide Mott–Schottky Heterostructures for Photocatalytic Water Oxidation
Publisher: American Chemical Society (ACS)
Date: 02-03-2022
An extension to the analytical evaluation of the oxygen reduction reaction based on the electrokinetics on a rotating ring-disk electrode
Publisher: Wiley
Date: 20-01-2016
Hierarchical mesoporous yolk–shell structured carbonaceous nanospheres for high performance electrochemical capacitive energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CC09366F
Abstract: Hierarchical mesoporous yolk–shell structured carbon nanospheres show significantly enhanced electrochemical performance.
3D Aperiodic Hierarchical Porous Graphitic Carbon Material for High‐Rate Electrochemical Capacitive Energy Storage
Publisher: Wiley
Date: 10-02-2009
Aligned Titania Nanotubes as an Intercalation Anode Material for Hybrid Electrochemical Energy Storage
Publisher: Wiley
Date: 08-12-2008
Carboxymethyl cellulose binders enable high-rate capability of sulfurized polyacrylonitrile cathodes for Li-S batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA00040E
Abstract: Water-processable binders improved the electrode polarity and wettability. Li–S batteries consisting of such binders exhibited superior performance at high current densities.
A ternary system exploiting the full solar spectrum to generate renewable hydrogen from a waste biomass feedstock
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE00603D
Abstract: A solar-driven system is proposed capable of hydrogen production from waste biomass with low carbon and water footprints.
Diameter-selective growth of single-walled carbon nanotubes with high quality by floating catalyst method
Publisher: American Chemical Society (ACS)
Date: 07-08-2008
DOI: 10.1021/NN8003394
Abstract: High-quality single-walled carbon nanotubes (SWNTs) with tunable diameters were synthesized by an improved H(2)/CH(4)-based floating catalyst method. Transmission electron microscopy observations and Raman results demonstrated the overall quality of the as-synthesized s les with finely tailored large diameters at 1.28, 1.62, 1.72, 1.91, and 2.13 nm, depending on the experimental conditions. In addition, Raman analysis revealed that the abundance of specific (n, m) SWNTs could be selectively enriched simultaneously along with the diameter modulation. It was found that the selective etching effects of high hydrogen flow stabilized the decomposition of ultralow CH(4) flow and considerably suppressed the deposition of amorphous carbon and small nanotubes, leading to very pure s les with high structural homogeneity suitable for further applications in practical electronic systems.
Controlled Electrochemical Charge Injection to Maximize the Energy Density of Supercapacitors
Publisher: Wiley
Date: 19-02-2013
Hybrid Solid Polymer Electrolytes with Two-Dimensional Inorganic Nanofillers
Publisher: Wiley
Date: 20-11-2018
Abstract: Solid polymer electrolytes are of rapidly increasing importance for the research and development of future safe batteries with high energy density. The ersified chemistry and structures of polymers allow the utilization of a wide range of soft structures for all-polymer solid-state electrolytes. With equal importance is the hybrid solid-state electrolytes consisting of both "soft" polymeric structure and "hard" inorganic nanofillers. The recent emergence of the re-discovery of many two-dimensional layered materials has stimulated the booming of advanced research in energy storage fields, such as batteries, supercapacitors, and fuel cells. Of special interest is the mass transport properties of these 2D nanostructures for water, gas, or ions. This review aims at the current progress and prospective development of hybrid polymer-inorganic solid electrolytes based on important 2D materials, including natural clay and synthetic lamellar structures. The ion conduction mechanism and the fabrication, property and device performance of these hybrid solid electrolytes will be discussed.
An integrated nanocarbon–cellulose membrane for solid-state supercapacitors
Publisher: Elsevier BV
Date: 05-02-2016
Tungsten Oxide/Carbide Surface Heterojunction Catalyst with High Hydrogen Evolution Activity
Publisher: American Chemical Society (ACS)
Date: 23-10-2020
Unusual High Oxygen Reduction Performance in All-Carbon Electrocatalysts
Publisher: Springer Science and Business Media LLC
Date: 05-09-2014
DOI: 10.1038/SREP06289
Hydrophilic tannic acid-modified WS2 nanosheets for enhanced polysulfide conversion in aqueous media
Publisher: IOP Publishing
Date: 20-11-2018
Assembly of 1T′-MoS2 based fibers for flexible energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR00487A
Abstract: The hydrothermal synthesis of well-soluble 1T′-MoS 2 sheets and the assembly of 1T′-MoS 2 /graphene oxide fibers from liquid crystals endow excellent electrochemical properties.
High-Energy MnO2 Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors
Publisher: American Chemical Society (ACS)
Date: 21-09-2010
DOI: 10.1021/NN101754K
Abstract: In order to achieve high energy and power densities, we developed a high-voltage asymmetric electrochemical capacitor (EC) based on graphene as negative electrode and a MnO(2) nanowire/graphene composite (MGC) as positive electrode in a neutral aqueous Na(2)SO(4) solution as electrolyte. MGC was prepared by solution-phase assembly of graphene sheets and α-MnO(2) nanowires. Such aqueous electrolyte-based asymmetric ECs can be cycled reversibly in the high-voltage region of 0-2.0 V and exhibit a superior energy density of 30.4 Wh kg(-1), which is much higher than those of symmetric ECs based on graphene//graphene (2.8 Wh kg(-1)) and MGC//MGC (5.2 Wh kg(-1)). Moreover, they present a high power density (5000 W kg(-1) at 7.0 Wh kg(-1)) and acceptable cycling performance of ∼79% retention after 1000 cycles. These findings open up the possibility of graphene-based composites for applications in safe aqueous electrolyte-based high-voltage asymmetric ECs with high energy and power densities.
Electrochemical interfacial capacitance in multilayer graphene sheets: Dependence on number of stacking layers
Publisher: Elsevier BV
Date: 09-2009
Nanospace-confined formation of flattened Sn sheets in pre-seeded graphenes for lithium ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR01924E
Abstract: Flattened Sn sheets with high electrochemical performance are prepared by pre-seeding and templating techniques in the interlayer nanospace of a graphene membrane.
Dispersible percolating carbon nano-electrodes for improvement of polysulfide utilization in Li-S batteries
Publisher: Elsevier BV
Date: 11-2015
Fibrous hybrid of graphene and sulfur nanocrystals for high-performance lithium-sulfur batteries
Publisher: American Chemical Society (ACS)
Date: 16-05-2013
DOI: 10.1021/NN401228T
Abstract: Graphene-sulfur (G-S) hybrid materials with sulfur nanocrystals anchored on interconnected fibrous graphene are obtained by a facile one-pot strategy using a sulfur/carbon disulfide/alcohol mixed solution. The reduction of graphene oxide and the formation/binding of sulfur nanocrystals were integrated. The G-S hybrids exhibit a highly porous network structure constructed by fibrous graphene, many electrically conducting pathways, and easily tunable sulfur content, which can be cut and pressed into pellets to be directly used as lithium-sulfur battery cathodes without using a metal current-collector, binder, and conductive additive. The porous network and sulfur nanocrystals enable rapid ion transport and short Li(+) diffusion distance, the interconnected fibrous graphene provides highly conductive electron transport pathways, and the oxygen-containing (mainly hydroxyl/epoxide) groups show strong binding with polysulfides, preventing their dissolution into the electrolyte based on first-principles calculations. As a result, the G-S hybrids show a high capacity, an excellent high-rate performance, and a long life over 100 cycles. These results demonstrate the great potential of this unique hybrid structure as cathodes for high-performance lithium-sulfur batteries.
A 2D Conductive Organic–Inorganic Hybrid with Extraordinary Volumetric Capacitance at Minimal Swelling
Publisher: Wiley
Date: 16-05-2018
Abstract: Rational design and synthesis of 2D organic-inorganic hybrid materials is important for transformative technological advances for energy storage. Here, a 2D conductive hybrid lamella and its intercalation properties for thin-film supercapacitors are reported. The 2D organic-inorganic hybrid lamella comprises periodically stacked 2D nanosheets with 11.81 Å basal spacing, and is electronically conductive (605 S m
Two‐Dimensional Porous Carbon: Synthesis and Ion‐Transport Properties
Publisher: Wiley
Date: 24-07-2015
Abstract: Their chemical stability, high specific surface area, and electric conductivity enable porous carbon materials to be the most commonly used electrode materials for electrochemical capacitors (also known as supercapacitors). To further increase the energy and power density, engineering of the pore structures with a higher electrochemical accessible surface area, faster ion-transport path and a more-robust interface with the electrolyte is widely investigated. Compared with traditional porous carbons, two-dimensional (2D) porous carbon sheets with an interlinked hierarchical porous structure are a good candidate for supercapacitors due to their advantages in high aspect ratio for electrode packing and electron transport, hierarchical pore structures for ion transport, and short ion-transport length. Recent progress on the synthesis of 2D porous carbons is reported here, along with the improved electrochemical behavior due to enhanced ion transport. Challenges for the controlled preparation of 2D porous carbons with desired properties are also discussed these require precise tuning of the hierarchical structure and a clarification of the formation mechanisms.
Graphene–Cellulose Paper Flexible Supercapacitors
Publisher: Wiley
Date: 10-08-2011
Oriented and Interlinked Porous Carbon Nanosheets with an Extraordinary Capacitive Performance
Publisher: American Chemical Society (ACS)
Date: 19-11-2014
DOI: 10.1021/CM503845Q
Graphene-Wrapped Fe3O4 Anode Material with Improved Reversible Capacity and Cyclic Stability for Lithium Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 26-08-2010
DOI: 10.1021/CM101532X
N,P co-coordinated Fe species embedded in carbon hollow spheres for oxygen electrocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA03011E
Abstract: Carbon hollow spheres (FeNPC) with single-atomic and octahedral FeN x P y active sites are fabricated for oxygen electrocatalysis.
Structural Origin of the Activity in Mn3 O4 -Graphene Oxide Hybrid Electrocatalysts for the Oxygen Reduction Reaction
Publisher: Wiley
Date: 07-09-2015
Abstract: Non-precious metal oxide/carbon hybrid electrocatalysts are of increasing importance for the oxygen reduction reaction (ORR). A synergistic effect is commonly used to explain the superior ORR activity exerted by metal oxide/nanocarbon hybrids, and this effect is attributed to covalently coupled interfaces between the two materials. However, the origin of the high activity, the structure, and the electrocatalytic nature of the interface remain unclear. By combining X-ray photoelectron spectroscopy with synchrotron far-infrared spectroscopy, we resolved the interface structure between spinel manganese oxide nanocrystals and graphene oxide nanoribbons, and the role of this interface in the promoted ORR. Moreover, we demonstrated the excellent ORR activity by a functional synergism of the hybrid constituents through a series of comparative electrochemical experiments.
A Discussion on the Activity Origin in Metal-Free Nitrogen-Doped Carbons for Oxygen Reduction Reaction and their Mechanisms
Publisher: Wiley
Date: 03-09-2015
Abstract: The origin of oxygen reduction reaction activity in metal-free N-doped carbons has been a stimulating, yet unsolved issue for the rational design of cost-effective electrocatalysts for fuel cells and metal-air batteries. At present, there are several inconsistent opinions on the materials chemistry and the mechanism of the oxygen reduction reaction (ORR) performed on this type of materials. This article provides a brief review of the current understanding of ORR processes and the history of electrocatalyst development. With special attention, the focus of the discussion is on the major contentions of the current opinions towards metal-free N-doped carbon chemistry and the arguments for the probable ORR mechanisms. By clarifying the fundamental aspects of each opinion, a converging consensus on N-doped carbon electrocatalysts can be established and thus facilitate the substantial development of large-capacity energy devices.
A Graphene–Pure‐Sulfur Sandwich Structure for Ultrafast, Long‐Life Lithium–Sulfur Batteries
Publisher: Wiley
Date: 04-11-2013
Towards a reliable Li-metal-free LiNO3-free Li-ion polysulphide full cell via parallel interface engineering
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8EE00937F
Abstract: Synchronously engineering the interface compatibility of the anode and the cathode in a Li–polysulfide electrolyte enables a full cell design with improved safety, durability and performance.
Suitability of representative electrochemical energy storage technologies for ramp-rate control of photovoltaic power
Publisher: Elsevier BV
Date: 04-2018
In situ modification of BiVO4 nanosheets on graphene for boosting photocatalytic water oxidation
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR02718A
Abstract: We propose an innovative in situ modification strategy for constructing ultrapure BiVO 4 nanosheets on graphene toward accelerated photocatalytic water oxidation reaction.
Covalent fixing of sulfur in metal–sulfur batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9EE03408K
Abstract: This review proposes the concept of covalent fixing as a new research strategy for sulfur electrochemistry in advanced metal–sulfur batteries.
Cover Feature: Core/Shell NiFe Nanoalloy with a Discrete N‐doped Graphitic Carbon Cover for Enhanced Water Oxidation (ChemElectroChem 5/2018)
Publisher: Wiley
Date: 21-02-2018
Integrating SEI into Layered Conductive Polymer Coatings for Ultrastable Silicon Anodes
Publisher: Wiley
Date: 30-06-2022
Abstract: Tackling the huge volume expansion of silicon (Si) anode desires a stable solid electrolyte interphase (SEI) to prohibit the interfacial side reactions. Here, a layered conductive polyaniline (LCP) coating is built on Si nanoparticles to achieve high areal capacity and long lifespan. The conformal LCP coating stores electrolyte in interlamination spaces and directs an in situ formation of LCP‐integrated hybrid SEI skin with uniform distribution of organic and inorganic components, enhancing the flexibility of the SEI to buffer the volume changes and maintaining homogeneous ion transport during cycling. As a result, the Si anode shows a remarkable cycling stability under high areal capacity (≈3 mAh cm −2 ) after 150 cycles and good rate performance of 942 mAh g −1 at 5 A g −1 . This work demonstrates the great potential of regulating the SEI properties by a layered polymer‐directing SEI formation for the mechanical and electrochemical stabilization of Si anodes.
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