ORCID Profile
0000-0002-4400-4578
Current Organisations
University of Malaya
,
City University of Hong Kong
,
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)
Nanomaterials | Functional Materials | Physical Chemistry of Materials | Catalysis and Mechanisms of Reactions | Macromolecular and Materials Chemistry | Chemical Engineering Design | Environmental Technologies | Materials Engineering | Environmental Technologies | Chemical Engineering | Chemical Engineering Not Elsewhere Classified | Composite and Hybrid Materials | Theory and Design of Materials
ANZSRC Socio-Economic Objective (SEO)
Renewable energy | Hydrogen Production from Renewable Energy | Energy transformation not elsewhere classified | Energy storage and distribution | Conservation and efficiency | Gas—conversion to liquid fuels | Transport | Renewable energy not elsewhere classified (e.g. geothermal) | Expanding Knowledge in Engineering |
Related Links
Publications
Photocatalytic Overall Water Splitting over ALi2Ti6O14(A: 2Na and Sr) with Tunneling Structure
Publisher: The Chemical Society of Japan
Date: 05-01-2011
DOI: 10.1246/CL.2011.108
Visible-light photocatalysis and charge carrier dynamics of elemental crystalline red phosphorus
Publisher: AIP Publishing
Date: 10-07-2020
DOI: 10.1063/5.0013142
Abstract: Elemental red phosphorus (red P) is a new class of photocatalysts with a desirable bandgap of ∼1.7 eV and has a strong visible-light response. Here, we show that the efficiency of red P is limited by severe electron trapping at deep traps that are intrinsic to the different crystal facets of the red P. To overcome this, we synthesized the red P/RGO (reduced graphene oxide) composite in a one-step oule chemical vapor deposition synthesis that formed a conducive interface between the red P photocatalyst and the RGO acceptor for efficient interfacial charge transport. As substantiated through photoelectrochemical characterization and ultrafast (femtoseconds) transient absorption spectroscopy, the interfacing with RGO provided a rapid pathway for the photocharges in red P to be interfacially separated, thereby circumventing the slower the charge trapping process. As a result, up to a sevenfold increase in the photocatalytic hydrogen production rate (apparent quantum yield = 3.1% at 650 nm) was obtained for the red P/RGO relative to the pristine red P.
Revisiting the mechanism of hexavalent chromium ion reduction: The parallel photodecomposition and photocatalytic reduction of chromate(VI) ester
Publisher: Elsevier BV
Date: 08-2017
Preface: Advancement in Energy and Environmental Catalysis in Asia Pacific (Selected contributions from APCChE 2017)
Publisher: Elsevier BV
Date: 09-2018
Selective catalytic oxidation of ammonia over nano Cu/zeolites with different topologies
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EN00007H
Abstract: The implementation of selective catalytic oxidation of ammonia (NH 3 -SCO) in automobile and stationary exhausts treatment allows the possibility to inject excess amount of NH 3 to fully reduce NO x molecules as part of the solution toward achieving zero NO x emissions.
Flame-Sprayed Superparamagnetic Bare and Silica-Coated Maghemite Nanoparticles: Synthesis, Characterization, and Protein Adsorption−Desorption
Publisher: American Chemical Society (ACS)
Date: 12-2006
DOI: 10.1021/CM061861V
Graphene oxide-based electrochemical sensor
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA02247E
Abstract: Facile functionalization of graphene oxide sheets on gold surface results in complexation-enhanced electrochemical detection of heavy metal ions, shown here for Pb 2+ , Cu 2+ and Hg 2+ , with improved detection limits by two orders of magnitude relative to the control electrode.
Studies of Nanosized Iron-Doped TiO2 Photocatalysts by Spectroscopic Methods
Publisher: Springer Science and Business Media LLC
Date: 27-03-2017
Cytotoxic origin of copper(II) oxide nanoparticles: Comparative studies with micron-sized particles, leachate, and metal salts
Publisher: American Chemical Society (ACS)
Date: 12-08-2011
DOI: 10.1021/NN2020248
Abstract: The work investigates the source of toxicity of copper oxide nanoparticles (CuO NPs) with respect to its leaching characteristic and speciation. Complexation-mediated leaching of CuO NPs by amino acids was identified as the source of toxicity toward Escherichia coli, the model microorganism used in the current study. The leached copper-peptide complex induces a multiple-fold increase in intracellular reactive oxygen species generation and reduces the fractions of viable cells, resulting in the overall inhibition of biomass growth. The cytotoxicity of the complex leachate is however different from that of equivalent soluble copper salts (nitrates and sulfates). A pH-dependent copper speciation during the addition of copper salts gives rise to uncoordinated copper ions, which in turn result in greater toxicity and cell lysis, the latter of which was not observed for CuO NPs even at comparable pH. Since leaching did not occur with micrometer-sized CuO, no cytotoxicty effect was observed, thus highlighting the prominence of materials toxicity at the nanoscale.
Investigation of the Exchange Kinetics and Surface Recovery of CdxHg1–xTe Quantum Dots during Cation Exchange Using a Microfluidic Flow Reactor
Publisher: American Chemical Society (ACS)
Date: 22-03-2017
Insight towards the role of platinum in the photocatalytic mineralisation of organic compounds
Publisher: Elsevier BV
Date: 02-2007
Decrease of the required dopant concentration for δ-Bi2O3crystal stabilization through thermal quenching during single-step flame spray pyrolysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CE02430G
Designing Photoelectrodes for Photocatalytic Fuel Cells and Elucidating the Effects of Organic Substrates
Publisher: Wiley
Date: 13-11-2015
Abstract: Photocatalytic fuel cells (PFCs) are constructed from anodized photoanodes with the aim of effectively converting organic materials into solar electricity. The syntheses of the photoanodes (TiO2 , WO3 , and Nb2 O5 ) were optimized using the statistical 2(k) factorial design. A systematic study was carried out to catalog the influence of eleven types of organic substrate on the photocurrent responses of the photoanodes, showing dependence on the adsorption of the organic substrates and on the associated photocatalytic degradation mechanisms. Strong adsorbates, such as carboxylic acids, generated high photocurrent enhancements. Simple and short-chained molecules, such as formic acid and methanol, are the most efficient in the corresponding carboxylic acid and alcohol groups as a result of their fast degradation kinetics. The TiO2 -based PFC yielded the highest photocurrent and obtainable power, whereas the Nb2 O5 -based PFC achieved the highest open-circuit voltage, which is consistent with its most negative Fermi level.
The Role of Cocatalysts on Bismuth Vanadate in the Abatement of Endocrine Disrupting Chemicals and Related Compounds under Visible Light
Publisher: Wiley
Date: 03-02-2017
Machine Learning for Accelerated Discovery of Solar Photocatalysts
Publisher: American Chemical Society (ACS)
Date: 07-10-2020
Semiconductor Nanocrystals as Luminescent Down-Shifting Layers To Enhance the Efficiency of Thin-Film CdTe/CdS and Crystalline Si Solar Cells
Publisher: American Chemical Society (ACS)
Date: 17-01-2014
DOI: 10.1021/JP410279Z
Cellular uptake and reactive oxygen species modulation of cerium oxide nanoparticles in human monocyte cell line U937
Publisher: Elsevier BV
Date: 11-2012
DOI: 10.1016/J.BIOMATERIALS.2012.07.024
Abstract: Cerium oxide nanoparticles (nanoceria) are promising materials for intracellular oxygen free radical scavenging providing a potential therapy for reactive oxygen species (ROS)-mediated inflammatory processes. In this study rhombohedral-shaped nanoceria were synthesized by flame spray pyrolysis with tuneable particle diameters between 3 and 94 nm by changing the liquid precursor flow rate. Monocytes and macrophages are major players in inflammatory processes as their production of ROS species has important downstream effects on cell signalling. Therefore, this study examined the ability of the nanoceria to be internalised by the human monocytic cell line, U937, and scavenge intracellular ROS. U937 cells activated in the presence of phorbol 12-myristate 13-acetate (PMA) were found to be more responsive to the nanoceria than U937 cells, which may not be surprising given the role of monocyte/macrophages in phagocytosing foreign material. The smaller particles were found to contain more crystal lattice defects with which to scavenge ROS, however a greater proportion of both the U937 and activated U937 cell populations responded to the larger particles. Hence all nanoceria particle sizes examined in this study were equally effective in scavenging intracellular ROS.
In situ metal doping during modified anodization synthesis of Nb2O5 with enhanced photoelectrochemical water splitting
Publisher: Wiley
Date: 10-2015
DOI: 10.1002/AIC.15048
Ru-Doped Cobalt−Zirconia Nanocomposites by Flame Synthesis: Physicochemical and Catalytic Properties
Publisher: American Chemical Society (ACS)
Date: 23-05-2008
DOI: 10.1021/CM8002657
Zinc oxide nanoparticles induce cell filamentation in escherichia coli
Publisher: Wiley
Date: 28-02-2013
Progress in Heterogeneous Photocatalysis: From Classical Radical Chemistry to Engineering Nanomaterials and Solar Reactors
Publisher: American Chemical Society (ACS)
Date: 17-02-2012
DOI: 10.1021/JZ3000646
Abstract: The field of heterogeneous photocatalysis has expanded rapidly in the last four decades, having undergone various evolutionary phases related to energy and the environment. The two most significant applications of photocatalysis are geared toward solar water splitting and the purification of air and water. Notably, the interdisciplinary nature of the field has increased significantly, incorporating semiconductor physics, surface sciences, photo and physical chemistry, materials science, and chemical engineering. Whereas this forms the basis on which the field continues to grow, adequate bridging of multidisciplinary knowledge remains essential. By recalling some of the classical fundamentals of photocatalysis, this Perspective provides contemporary views on heterogeneous photochemical conversion, encompassing charge transport characteristics, radical chemistry and organic degradation mechanisms, photocatalyst design, and photoreactor engineering.
Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation
Publisher: Springer Science and Business Media LLC
Date: 23-01-2020
Understanding photocatalytic metallization of preadsorbed ionic gold on titania, ceria, and Zirconia
Publisher: American Chemical Society (ACS)
Date: 07-10-2010
DOI: 10.1021/LA902592P
Abstract: A nonaqueous photodeposition procedure for forming Au nanoparticles on semiconducting supports (TiO(2), CeO(2), and ZrO(2)) was investigated. Intrinsic excitation of the support was sufficient to induce Au(0) nucleation, without the need for an organic hole-scavenging species. Photoreduction rates were higher over TiO(2) and ZrO(2) than over CeO(2), likely due to a lower rate of photogenerated electron recombination. Illumination resulted in metallization of the adsorbed Au species and formation of crystalline Au nanoparticles dispersed across the oxide surfaces. On the basis of transmission electron microscopy (TEM) evidence of a strong Au particle-metal oxide interaction, it is proposed that Au deposit formation proceeds via the nucleation of highly dispersed clusters which can diffuse and amalgamate at room temperature to form larger surface-defect-immobilized clusters, with the final particle size being significantly smaller than that achieved by conventional aqueous photodeposition. From this work, it is possible to draw several new fundamental insights, with regards to both the nonaqueous photodeposition process and the general mechanism by which dispersed metallic Au nanoparticles are formed from ionic precursors adsorbed upon metal oxide supports.
Evolution of morphology and magnetic properties in silica/maghemite nanocomposites
Publisher: American Chemical Society (ACS)
Date: 11-06-2009
DOI: 10.1021/JP902684G
Structural Evolution of Cu/ZnO Active Sites: From Reactive Environment to Ultrahigh Vacuum
Publisher: Wiley
Date: 03-07-2014
Flame‐Synthesized Ceria‐Supported Copper Dimers for Preferential Oxidation of CO
Publisher: Wiley
Date: 02-02-2009
Charge transport in dye-sensitized solar cells based on flame-made TiO 2 nanoparticles
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2010
Flame Preparation of Visible-Light-Responsive BiVO4 Oxygen Evolution Photocatalysts with Subsequent Activation via Aqueous Route
Publisher: American Chemical Society (ACS)
Date: 20-05-2011
DOI: 10.1021/AM200247Y
Abstract: Visible-light-active BiVO(4) photocatalyst prepared by a one-step flame spray pyrolysis demonstrates the structural evolution from amorphous to crystalline scheelite-tetragonal and further to scheelite-monoclinic (the photocatalytic active phase). Up to 95% scheelite-monoclinic content, the rest being scheelite-tetragonal, can be achieved in situ by exposing the collection filter to higher flame temperature. Reasonable activity in terms of photocatalytic O(2) evolution was obtained with the increase in crystallinity and scheelite-monoclinic content. Although analogous postcalcination of BiVO(4) improves crystallization and phase transformation, it inevitably induces vacancy defects that are detrimental to the photocatalytic activity. Hence a facile aqueous acid treatment on the flame-made BiVO(4) is introduced, which in the presence of small addition of Bi and V promotes full transformation to scheelite-monoclinic and reduces charge trapping defects. As a result, the photocatalytic O(2) evolution activity was increased by a remarkable 5 folds compared to the best performing untreated flame-made BiVO(4).
Temperature-induced evolution of reaction sites and mechanisms during preferential oxidation of CO
Publisher: Elsevier BV
Date: 03-01-2011
Floe strength characterization technique. An insight into silica aggregation
Publisher: American Chemical Society (ACS)
Date: 22-06-2004
DOI: 10.1021/LA049651P
Abstract: This paper tests an approach to the estimation of relative particle bond strength based on the nondimensional floc and aggregation factors. The strength of flocs formed by aggregating nanosized silica particles with the addition of potassium chloride (KCl) or cationic surfactants, alkyltrimethylammonium bromide (mixture of CTAB, DTAB, and MTAB) was analyzed. The bonding force of the flocs formed in surfactant compared to that formed in the KCl system was estimated using the new dimensional analysis approach. This force ratio was then compared to that obtained by atomic force microscopy.
Flame spray pyrolysis: An enabling technology for nanoparticles design and fabrication
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0NR00017E
Abstract: Combustion of appropriate precursor sprays in a flame spray pyrolysis (FSP) process is a highly promising and versatile technique for the rapid and scalable synthesis of nanostuctural materials with engineered functionalities. The technique was initially derived from the fundamentals of the well-established vapour-fed flame aerosols reactors that was widely practised for the manufacturing of simple commodity powders such as pigmentary titania, fumed silica, alumina, and even optical fibers. In the last 10 years however, FSP knowledge and technology was developed substantially and a wide range of new and complex products have been synthesised, attracting major industries in a erse field of applications. Key innovations in FSP reactor engineering and precursor chemistry have enabled flexible designs of nanostructured loosely-agglomerated powders and particulate films of pure or mixed oxides and even pure metals and alloys. Unique material morphologies such as core-shell structures and nanorods are possible using this essentially one step and continuous FSP process. Finally, research challenges are discussed and an outlook on the next generation of engineered combustion-made materials is given.
Direct (one-step) synthesis of TiO
Publisher:
Elsevier BV
Date:
11-2005
Publisher: Elsevier BV
Date: 11-2005
Reversible Antimicrobial Photoswitching in Nanosilver
Publisher: Wiley
Date: 29-01-2009
The stabilization and bio-functionalization of iron oxide nanoparticles using heterotelechelic polymers
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B815202K
Anti-angiogenic activity of heparin functionalised cerium oxide nanoparticles
Publisher: Elsevier BV
Date: 11-2013
DOI: 10.1016/J.BIOMATERIALS.2013.07.083
Abstract: Cerium oxide nanoparticles (nanoceria) are widely reported to be non-cytotoxic and modulate intracellular reactive oxygen species (ROS). In this study, nanoceria (dxRD = 12 nm) were functionalised with either 130 or 880 molecules of unfractionated heparin using the organosilane linker, 3-aminopropyltriethoxysilane. Nanoceria with a low level of heparin functionalisation were found to scavenge intracellular ROS to the same extent as unfunctionalised nanoceria and significantly more than cells exposed to medium only. In contrast, nanoceria with the highest level of heparin functionalisation were not as effective at scavenging intracellular ROS. Nanoceria were localised predominantly in the cytoplasm, while heparin-nanoceria were localised in both the cytoplasm and lysosomes. Together these data demonstrated that the level of nanoceria surface functionalisation with heparin determined the intracellular localisation and ROS scavenging ability of these particles. Additionally, heparin-nanoceria were effective in reducing endothelial cell proliferation indicating that they may find application in the control of angiogenesis in cancer in the future.
Spectroscopic Studies of Pristine and Fluorinated Nano-ZrO2 in Photostimulated Heterogeneous Processes
Publisher: American Chemical Society (ACS)
Date: 20-02-2009
DOI: 10.1021/JP809992G
Flame sprayed visible light-active Fe-TiO2 for photomineralisation of oxalic acid
Publisher: Elsevier BV
Date: 02-2007
Catalytic reduction of NO by CO over Cu/CexZr1−xO2 prepared by flame synthesis
Publisher: Elsevier BV
Date: 15-06-2010
Heterojunction Engineering of CdTe and CdSe Quantum Dots on TiO2 Nanotube Arrays: Intricate Effects of Size‐Dependency and Interfacial Contact on Photoconversion Efficiencies
Publisher: Wiley
Date: 10-04-2012
Probing Surface Properties and Reaction Intermediates During Heterogeneous Catalytic Oxidation of Acetaldehyde
Publisher: Wiley
Date: 28-09-2009
Charge Dynamics at Surface-Modified, Nanostructured Hematite Photoelectrodes for Solar Water Splitting
Publisher: The Electrochemical Society
Date: 05-2022
Abstract: The balance of the charge transfer and recombination kinetics of photoelectrodes governs the device efficiency for solar water splitting. Hematite ( α -Fe 2 O 3 ) is a photoanode typically used because of advantages such as its abundance, low cost, multiple convenient deposition methods, and an attractive bandgap energy however, poor electrical properties prevent high solar energy to hydrogen conversion efficiencies. In this work, we evaluate and compare several strategies to address this issue, using a nanorod array morphology and incorporation of overlayers of one or more materials that favor the charge carrier transfer kinetics and reduce surface recombination. We use intensity-modulated photocurrent spectroscopy (IMPS) to evaluate these systems, and demonstrate that the presence of TiO 2 and MoO x overlayers successfully suppresses surface recombination through passivation of hematite interfacial recombination sites. However, the hole transfer process at the overlayers occurs at more positive potentials due to the location of the new surface states at the overlayer—electrolyte interface. We show that the deposition of the CoP i oxygen evolution reaction co-catalyst partially addresses this disadvantage. The best efficiencies were obtained for the CoP i -TiO 2 / α −Fe 2 O 3 and CoP i -MoO x /TiO 2 / α −Fe 2 O 3 photoelectrodes, with internal quantum efficiencies of 0.42−0.44 under 455 nm irradiation.
Photocatalytic mineralisation of organic compounds: a comparison of flame-made TiO2 catalysts
Publisher: Springer Science and Business Media LLC
Date: 07-2007
Facile Functionalization and Phase Reduction Route of Magnetic Iron Oxide Nanoparticles for Conjugation of Matrix Metalloproteinase
Publisher: Wiley
Date: 06-2010
Selective visible light reduction of carbon dioxide over iridium(III)-terpyridine photocatalysts
Publisher: Elsevier BV
Date: 12-2021
Enhancing prediction accuracy of physical band gaps in semiconductor materials
Publisher: Elsevier BV
Date: 09-2023
Influence of the oxide support reducibility on the CO2 methanation over Ru-based catalysts
Publisher: Elsevier BV
Date: 12-2017
Supported gold clusters as effective and reusable photocatalysts for the abatement of endocrine-disrupting chemicals under visible light
Publisher: Elsevier BV
Date: 10-2017
Modulating charge transport in semiconductor photocatalysts by spatial deposition of reduced graphene oxide and platinum
Publisher: Elsevier BV
Date: 12-2015
Modulated anodization synthesis of Sn-doped iron oxide with enhanced solar water splitting performance
Publisher: Elsevier BV
Date: 06-2019
Inter-relationship between Pt oxidation states on TiO2 and the photocatalytic mineralisation of organic matters
Publisher: Elsevier BV
Date: 10-2007
Elucidating the Oxygen Activation Mechanism on Ceria-Supported Copper-Oxo Species Using Time-Resolved X-ray Absorption Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 25-03-2020
A Perspective on the Flame Spray Synthesis of Photocatalyst Nanoparticles
Publisher: MDPI AG
Date: 31-07-2013
DOI: 10.3390/MA6083194
Induced adaptation of Bacillus sp. to antimicrobial nanosilver
Publisher: Wiley
Date: 29-04-2013
Abstract: The natural ability of Bacillus sp. to adapt to nanosilver cytotoxicity upon prolonged exposure is reported for the first time. The combined adaptive effects of nanosilver resistance and enhanced growth are induced under various intensities of nanosilver-stimulated cellular oxidative stress, ranging from only minimal cellular redox imbalance to the lethal levels of cellular ROS stimulation. An important implication of the present work is that such adaptive effects lead to the ultimate domination of nanosilver-resistant Bacillus sp. in the microbiota, to which nanosilver cytotoxicity is continuously applied.
Insight into microstructural and magnetic properties of flame-made γ-Fe2 O3 nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B711705A
Dopant-free, polymorphic design of TiO2 nanocrystals by flame aerosol synthesis
Publisher: Elsevier BV
Date: 06-2011
Flame-made amorphous solid acids with tunable acidity for the aqueous conversion of glucose to levulinic acid
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9GC02567G
Abstract: Composition-tunable mixed Brønsted/Lewis acids on silica-alumina and silica-alumina-phosphate prepared by the rapid flame spray pyrolysis produce exceptionally high glucose-to-levulinic acid yield, twice that of commercial ZSM-5 and Zeolite X.
Photocatalytic H2 Evolution over TiO2 Nanoparticles. The Synergistic Effect of Anatase and Rutile
Publisher: American Chemical Society (ACS)
Date: 22-01-2010
DOI: 10.1021/JP910810R
Simulation of gas diffusion in highly porous nanostructures by direct simulation Monte Carlo
Publisher: Elsevier BV
Date: 02-2014
Functionalization Strategies for Protease Immobilization on Magnetic Nanoparticles
Publisher: Wiley
Date: 31-05-2010
Molybdenum Selenide nanosheets Surrounding nickel Selenides Sub-microislands on nickel foam as high-performance bifunctional electrocatalysts for water Splitting
Publisher: Elsevier BV
Date: 07-2020
Submicron and nano formulations of titanium dioxide and zinc oxide stimulate unique cellular toxicological responses in the green microalga Chlamydomonas reinhardtii
Publisher: Elsevier BV
Date: 09-2013
DOI: 10.1016/J.JHAZMAT.2013.06.067
Abstract: The work investigates the eco-cytoxicity of submicron and nano TiO₂ and ZnO, arising from the unique interactions of freshwater microalga Chlamydomonas reinhardtii to soluble and undissolved components of the metal oxides. In a freshwater medium, submicron and nano TiO₂ exist as suspended aggregates with no-observable leaching. Submicron and nano ZnO undergo comparable concentration-dependent fractional leaching, and exist as dissolved zinc and aggregates of undissolved ZnO. Cellular internalisation of solid TiO₂ stimulates cellular ROS generation as an early stress response. The cellular redox imbalance was observed for both submicron and nano TiO₂ exposure, despite exhibiting benign effects on the alga proliferation (8-day EC50>100 mg TiO₂/L). Parallel exposure of C. reinhardtii to submicron and nano ZnO saw cellular uptake of both the leached zinc and solid ZnO and resulting in inhibition of the alga growth (8-day EC50≥0.01 mg ZnO/L). Despite the sensitivity, no zinc-induced cellular ROS generation was detected, even at 100 mg ZnO/L exposure. Taken together, the observations confront the generally accepted paradigm of cellular oxidative stress-mediated cytotoxicity of particles. The knowledge of speciation of particles and the corresponding stimulation of unique cellular responses and cytotoxicity is vital for assessment of the environmental implications of these materials.
Enhanced photoelectrochemical charge transfer on Mn-doped CdS/TiO2 nanotube arrays: The roles of organic substrates
Publisher: Elsevier BV
Date: 09-2019
Chemical fuel cell reactor as the ultimate green reactor
Publisher: Elsevier BV
Date: 12-2021
Functionalized-graphene composites
Publisher: American Chemical Society (ACS)
Date: 11-2016
Preferential oxidation of carbon monoxide over Pt–FeO /CeO2 synthesized by two-nozzle flame spray pyrolysis
Publisher: Elsevier BV
Date: 09-2015
Efficient Photoelectrochemical Water Splitting over Anodized p-Type NiO Porous Films
Publisher: American Chemical Society (ACS)
Date: 31-10-2014
DOI: 10.1021/AM507138B
Abstract: NiO photocathodes were fabricated by alkaline etching-anodizing nickel foil in an organic-based electrolyte. The resulting films have a highly macroporous surface structure due to rapid dissolution of the oxide layer as it is formed during the anodization process. We are able to control the films' surface structures by varying the anodization duration and voltage. With an onset potential of +0.53 V versus the reversible hydrogen electrode (RHE), the photocurrent efficiency of the NiO electrodes showed dependencies on their surface roughness factor, which determines the extent of semiconductor-electrolyte interface and the associated quality of the NiO surface sites. A maximum incident photon-to-current conversion efficiency (IPCE(max)) of 22% was obtained from NiO film with a roughness factor of 8.4. Adding an Al2O3 blocking layer minimizes surface charge recombination on the NiO and hence increased the IPCE(max) to 28%. The NiO/Al2O3 films were extremely stable during photoelectrochemical water splitting tests lasting up to 20 h, continuously producing hydrogen and oxygen in the stoichiometric 2:1 ratio. The NiO/Al2O3 and NiO films fabricated using the alkaline anodization process produced 12 and 6 times as much hydrogen, respectively, as those fabricated using commercial NiO nanoparticles.
Methanation of carbon monoxide over promoted flame-synthesized cobalt clusters stabilized in zirconia matrix
Publisher: Elsevier BV
Date: 06-2015
Shuttling Photoelectrochemical Electron Transport in Tricomponent CdS/rGO/TiO2 Nanocomposites
Publisher: American Chemical Society (ACS)
Date: 27-09-2013
DOI: 10.1021/JP405227T
Enhanced hydrogen evolution rates at high pH with a colloidal cadmium sulphide–platinum hybrid system
Publisher: AIP Publishing
Date: 12-2014
DOI: 10.1063/1.4904070
Abstract: We demonstrate enhanced hydrogen generation rates at high pH using colloidal cadmium sulphide nanorods decorated with Pt nanoparticles. We introduce a simplified procedure for the decoration and subsequent hydrogen generation, reducing both the number of working steps and the materials costs. Different Pt precursor concentrations were tested to reveal the optimal conditions for the efficient hydrogen evolution. A sharp increase in hydrogen evolution rates was measured at pH 13 and above, a condition at which the surface charge transfer was efficiently mediated by the formation of hydroxyl radicals and further consumption by the sacrificial triethanolamine hole scavenger.
Engineering of Facets, Band Structure, and Gas‐Sensing Properties of Hierarchical Sn2+‐Doped SnO2 Nanostructures
Publisher: Wiley
Date: 09-04-2013
Hierarchical growth of SnO2 nanostructured films on FTO substrates: structural defects induced by Sn(ii) self-doping and their effects on optical and photoelectrochemical properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR00672K
Abstract: Direct hydrothermal growth of Sn(II)-doped SnO2 films on fluorine-doped tin oxide (FTO) substrates results in the formation of upstanding SnO2 nanosheet arrays covered by hierarchical SnO2 nanoflowers. The n-type semiconductor films show extended photoresponse in the visible spectrum arising from the coexistence of Sn(II) dopant ions and oxygen vacancies in these hierarchical SnO2 nanostructures, which leads to a narrowed bandgap. Photoluminescence spectroscopy revealed that the emission in the UV, blue and red spectral ranges is related to the evolution of Sn(II) dopants and oxygen vacancies with annealing temperature, whereas oxygen vacancies are mostly responsible for visible emission. The Sn(II)-doped SnO2 films show higher photocurrent when sensitized with narrow bandgap CdS nanoparticles, serving as efficient electron acceptors.
Polyhedral Oligomeric Silsesquioxane as a Ligand for CdSe Quantum Dots
Publisher: American Chemical Society (ACS)
Date: 17-01-2013
DOI: 10.1021/JP3112843
Cascade reaction engineering on zirconia-supported mesoporous MFI zeolites with tunable Lewis–Brønsted acid sites: a case of the one-pot conversion of furfural to γ-valerolactone
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA06915A
Abstract: The highly mesoporous ZrO 2 [Al]MFI-NS with close proximity of Brønsted and Lewis acid sites exhibited the one-pot conversion of furfural to γ-valerolactone (GVL) and achieved a high yield of 83% GVL.
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