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Electrolyte Effect on Photoetching of Gallium Nitride

Nanomanufacturing and Metrology 2024年第1期7卷 61-74页

作者： Huiqiang Liang Zhenghao Wei Jiongchong Fang Yanming Li Changli Li Zhirun Xie yun hau ng Guosong Zeng Shenzhen Key Laboratory of Intelligent Robotics and Flexible Manufacturing Systems Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China School of Materials Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China School of Energy and Environment City University of Hong KongKowloon 999077Hong Kong SARPeople’s Republic of China City University of Hong Kong Shenzhen Research Institute Shenzhen Hi-Tech Industrial ParkNanshan DistrictShenzhen 518000People’s Republic of China SUSTech Energy Institute for Carbon Neutrality Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

The limited material removal rate of conventional chemical mechanical polishing(CMP)significantly hinders the fabrica-tion efficiency and surface quality,thereby preventing the development of gallium nitride(GaN)-based ***,the incorporation of photoelectrochemistry in CMP has garnered increasing attention because of its potential to enhance the quality and efficiency of the GaN ***,a considerable gap still exists in the comprehensive understanding of the specific photoelectrochemical(PEC)behavior of ***,we report the influence of the electrolyte on the PEC etching of *** acids and bases were tested,with their pH being carefully *** concentrations of the cations and anions were also *** results showed that photocorrosion/photoetching was more pronounced in sulfuric acid,phosphoric acid,and nitric acid environments than in alkaline environments,but it was less pronounced in hydrochloric ***,the effects of pH and anion concentration on photoetching were investigated,and the results revealed that pho-toetching in acidic environments weakened with increasing pH levels and diminished with increasing sulfate *** underlying reasons contributing to this observation were *** findings provide ideas for improving the pho-toetching efficiency of GaN,thereby enriching the photoelectrochemical mechanical polishing(PECMP)technology of GaN.

关键词： GaN Photoelectrochemistry Photoetching pH

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A dual-electrolyte system for photoelectrochemical hydrogen generation using CuInS_2-In_2O_3-TiO_2 nanotube array thin film

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Science China Materials 2018年第6期61卷 895-904页

作者： Charlene ng Jung-Ho yun Hui Ling Tan Hao Wu Rose Amal yun hau ng Particles and Catalysis Research Group School of Chemical Engineering The University of New South Wales

The utilization of Na2S/Na2SO3 mixture as the electrolyte solution to stabilize sulfide anode in a photoelectrochemical cell for hydrogen evolution generally compromises the current-to-hydrogen efficiency（ηcurrent） of the system. Here, the employment of a dual-electrolyte system,that is, Na2S/Na2SO3 mixture and p H-neutral Na2SO4 as the respective electrolyte solutions in the anode and cathode chambers of a water splitting cell is demonstrated to suppress the photocorrosion of CuInS2-In2O3-TiO2 nanotube（CISIn2O3-TNT） heterostructure, while simultaneously boosts theηcurrent. Although n-type CIS and In2O3 nanoparticles can be easily formed on TNT array via facile pulse-assisted electrodeposition method, conformal deposition of the nanoparticles homogeneously on the nanotubes wall with preservation of the TNT hollow structure is shown to be essential for achieving efficient charge generation and separation within the heterostructure. In comparison to Na2S/Na2SO3 solution as the sole electrolyte in both the anode and cathode chambers, introduction of dual electrolyte is shown to not only enhance the photostability of the CIS-In2O3-TNT anode, but also lead to near-unity ηcurrentas opposed to the merely 20% ηcurrentof the single-electrolyte system.

关键词： dual-electrolyte hydrogen generation photoelectrochemical TiO2 nanotubes CuInS2

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A review on 2D MoS_(2) cocatalysts in photocatalytic H_(2) production

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Journal of Materials Science & Technology 2020年第21期56卷 89-121页

作者： Zizhan Liang Rongchen Shen yun hau ng Peng Zhang Quanjun Xiang Xin Li Key Laboratory of Energy Plants Resource and Utilization Ministry of Agriculture and Rural AffairsCollege of Forestry and Landscape ArchitectureSouth China Agricultural UniversityGuangzhou510642China School of Energy and Environment City University of Hong KongHong KongChina State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou450001China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

Owing to their unique physicochemical,optical and electrical properties,two-dimensional(2D)MoS_(2) cocatalysts have been widely applied in designing and developing highly efficient composite photocatalysts for hydrogen generation under suitable light *** this review,we first elaborated on the fundamental aspects of 2D MoS_(2) cocatalysts to include the structural design principles,synthesis strategies,strengths and ***,we thoroughly highlighted and discussed the modification strategies of 2D MoS_(2) H2-evolution cocatalysts,including doping heteroatoms(***,non-metals,and co-doping),designing interfacial coupling morphologies,controlling the physical properties(***,size,structural defects or pores),exposing the reactive facets or edge sites,constructing cocatalyst heterojunctions,engineering the interfacial bonds and confinement *** the future,the forefront challenges in understanding and in precise controlling of the active sites at molecular level or atomic level should be carefully studied,while various potential mechanisms of photogenerated-electrons interactions should be *** applications of MoS_(2) cocatalyst in the overall water splitting are also *** review may offer new inspiration for designing and constructing novel and efficient MoS_(2)-based composite photocatalysts for highly efficient photocatalytic hydrogen evolution.

关键词： 2D MoS2 cocatalysts Photocatalytic H2 production Heteroatom doping Cocatalyst heterojunctions Charge dynamics

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Engineering versatile Au-based catalysts for solar-to-fuel conversion

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能源化学:英文版 2023年第8期83卷 341-362,I0010页

作者： Chunhua Wang Hongwen Zhang Feili Lai Zhirun Xie yun hau ng Bo Weng Xuejiao Wu Yuhe Liao Department of Chemistry KU LeuvenCelestijinenlaan 200F3001 LeuvenBelgium cMACS Department of Microbial and Molecular SystemsKU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium School of Energy and Environment City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong 999077China Centre for Sustainable Catalysis and Engineering Faculty of Bioscience EngineeringKU Leuven3001 LeuvenBelgium Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640GuangdongChina

Gold(Au) nanostructures(NSs) have been widely employed as cocatalysts to improve the photoactivity of semiconductor materials, while a systematic summary of the engineering approaches of Au NSs to maximize the solar-to-fuel conversion efficiency is still lacking. In this review, the recently developed strategies for elevating the overall photocatalytic performance of Au-based catalysts and the deep physical chemistry mechanisms are highlighted. Firstly, the synthetic approaches of Au NSs are summarized, followed by an elaboration on their multiple functions in improving photoactivity. Afterward, modification strategies of Au NSs used to enhance the photocatalytic efficiency of Au-semiconductor composites,including controlling the Au NSs morphology, size, crystal phase, defect engineering, alloying with different metals, modulating interfacial interaction, and introducing an external field, are summarized and discussed independently. Additionally, advanced characterization techniques that can provide insights into the charge dynamics of the photocatalysts are introduced. Finally, we share our opinion on the challenges and outline potentially promising opportunities and directions for efficient Au-based photocatalysis research moving forward. We sincerely look forward to this review can deliver insightful views to design efficient Au-based photocatalysts and spur certain innovations to other metal-based catalysts.

关键词： Au nanostructures Modification strategies Semiconductor Photocatalysis Solar-to-fuel conversion

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FeCo alloy@N-doped graphitized carbon as an efficient cocatalyst for enhanced photocatalytic H2 evolution by inducing accelerated charge transfer

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Journal of Energy Chemistry 2021年第1期30卷 92-101,I0004页

作者： Sibo Chen yun hau ng Jihai Liao Qiongzhi Gao Siyuan Yang Feng Peng Xinhua Zhong Yueping Fang Shengsen Zhang Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643GuangdongChina Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510643GuangdongChina School of Energy and Environment City University of Hong KongHongkong 999077China Department of Physics South China University of TechnologyGuangzhou 510640GuangdongChina School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006GuangdongChina

Cocatalysts play important roles in improving the activity and stability of most *** is of great significance to develop economical,efficient and stable ***,using Na2CoFe(CN)6 complex as precursor,a novel noble-metal-free FeCo@ngC cocatalyst(nano-FeCo alloy@N-doped graphitized carbon) is fabricated by a simple pyrolysis *** with g-C3 N4, the optimal FeCo@ngC/g-C3N4 receives a boosted visible light driven photocatalytic H2 evolution rate of 42.2 μmol h-1, which is even higher than that of 1.0 wt% Pt modified g-C3N4 *** on the results of density functional theory(DFT) calculations and practical experiment measurements,such outstanding photocatalytic performance of FeCo@ngC/g-C3N4 is mainly attributed to two *** is the accelerated charge transfer behavior,induced by a photogene rated electrons secondary transfer performance on the surface of FeCo alloy *** other is related to the adjustment of H adsorption energy(approaching the standard hydrogen electrode potential) by the presence of external ngC thin *** factors play key roles in the H2 evolution *** outstanding performance highlights an enormous potential of developing noble-metal-free bimetallic nano-alloy as inexpensive and efficient cocatalysts for solar applications.

关键词： FeCo alloy nanoparticles Cocatalyst N-doped graphitized carbon g-C3N4 Visible light Hydrogen evolution

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Oxygen-deficient bismuth tungstate and bismuth oxide composite photoanode with improved photostability

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Science Bulletin 2018年第15期63卷 990-996页

作者： Hoi Ying Chung Weijian Chen Xiaoming Wen Judy N. Hart Hao Wu Yuekun Lai Rose Amal yun hau ng Particles and Catalysis Research Croup School of Chemical Engineering The University of New South Wales (UNSW) Sydney NSW 2052 Australia School of Photovoltaic and Renewable Energy Engineering The University of New South Wales (UNSW) Sydney NSW 2052 Australia Centre for Micro-Photonics Faculty of Science Engineering and Technology Swinburne University of Technology Melbourne VIC 2122 Australia School of Materials Science and Engineering The University of New South Wales (UNSW) Sydney NSW 2052 Australia National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering Soochow University Suzhou 215123 China

A homogeneous layer of Bi_2O_3-Bi_(14)WO_(24) composite(BWO/Bi_2O_3) thin film was fabricated using a combination of electrodeposition and thermal treatment. The evenly distributed Bi14 WO24 component within the Bi_2O_3 layer was found to be important in stabilising the photoelectrochemical performances of Bi_2O_3 photoanode by promoting the photoelectron transport. The unmodified Bi_2O_3 suffered from severe photocorrosion as proven by X-ray diffraction(XRD) and inductively coupled plasma(ICP) analyses while the composite thin film was active without noticeable activity decay for at least 3 h of illumination. This strategy might be applicable to other photocatalysts with stability issues.

关键词： Bismuth oxide Bismuth tungstate Photocorrosion

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Reduced graphene oxide is not a universal promoter for photocatalytic activities of TiO_(2)

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Journal of Materiomics 2017年第1期3卷 51-57页

作者： Hui Ling Tan Frans Denny Mandalena Hermawan Roong Jien Wong Rose Amal yun hau ng Particles and Catalysis Research Group School of Chemical EngineeringThe University of New South WalesNSW2052Australia

Addition of reduced graphene oxide(RGO)to P25 TiO_(2)was made and its impacts on photocatalytic oxidation of various organic substances were *** the presence of RGO in TiO_(2)can enhance certain TiO_(2)-based photocatalytic reactions,it is not a universal observation that can be expected in all types of organic *** factor of photocatalytic activity enhancement is strongly affected by the various functional groups appeared in the organic *** this work,it is realised that the length of alkyl chain in alcohols and carboxylic acids have the minimum influence on the overall activity while the number of hydroxyl groups can promote the further activity enhancement in the presence of RGO.

关键词： Photocatalytic activity Titanium dioxide Reduced graphene oxide Glycerol

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Heterogeneous N-coordinated single-atom photocatalysts and electrocatalysts

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Chinese Journal of Catalysis 2022年第10期43卷 2453-2483页

作者： Rongchen Shen Lei Hao yun hau ng Peng Zhang Arramel Arramel Youji Li Xin Li Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and Utilization Ministry of AgricultureSouth China Agricultural UniversityGuangzhou 511443GuangdongChina School of Energy and Environment City University of Hong KongHong KongChina Shenzhen Research Institute City University of Hong KongShenzhen Hi-Tech Industrial ParkShenzhen 518057GuangdongChina State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina Department of Physics National University of SingaporeSingapore 117551Singapore Nano Center Indonesia Jl.PUSPIPTEK South TangerangBanten 15314Indonesia College of Chemistry and Chemical Engineering Jishou UniversityJishou 416000HunanChina

Single-atom catalysts(SACs)have been widely used in heterogeneous catalysis owing to the maximum utilization of metal-active sites with controlled structures and well-defined *** tailored coordination with nitrogen atom,the metal-nitrogen(M-N)-based SACs have demonstrated interesting physical,optical and electronic properties and have become intense in photocatalysis and electrocatalysis in the past *** substantial efforts in constructing various M–N-based SACs,the principles for modulating the intrinsic photocatalytic and electrocatalytic performance of their active sites and catalytic mechanism have not been sufficiently ***,the present review intends to shed some light on recent research made in studying the correlation between intrinsic electronic structure,catalytic mechanism,single-metal atom(SMA)confinement and their photocatalytic and electrocatalytic activities(conversion,selectivity,stability and etc).Based on the analysis of fundamentals of M–N-based SACs,theoretical calculations and experimental investigations,including synthetic methods and characterization techniques,are both included to provide an integral understanding of the underlying mechanisms behind improved coordination structure and observed ***,the challenges and perspectives for constructing highly active M–N based photocatalysis and electrocatalysis SACs are *** particular,extensive technical and mechanism aspects are thoroughly discussed,summarized and analyzed for promoting further advancement of M-N-based SACs in photocatalysis and electrocatalysis.

关键词： N-coordinated single-atom catalyst Photocatalysis Electrocatalysis Electronic structure Active site

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Constructing low-cost Ni3C/twin-crystal Zn0.5Cd0.5S heterojunction/homojunction nanohybrids for efficient photocatalytic H2 evolution

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Chinese Journal of Catalysis 2021年第1期42卷 25-36页

作者： Rongchen Shen Yingna Ding Shibang Li Peng Zhang Quanjun Xiang yun hau ng Xin Li College of Forestry and Landscape Architecture Key Laboratory of Energy Plants Resource and UtilizationMinistry of AgricultureSouth China Agricultural UniversityGuangzhou 510642GuangdongChina College of Materials and Energy South China Agricultural UniversityGuangzhou 510642GuangdongChina State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina School of Energy and Environment City University of Hong KongHong Kong SAR

The development of low-cost semiconductor photocatalysts for highly efficient and durable photocatalytic H2 evolution under visible light is very *** this study,we combine low-cost metallic Ni3C cocatalysts with twin nanocrystal Zn0.5Cd0.5S(ZCS)solid solution homojunctions for an efficient visible-light-driven H2 production by a simple ***-synthesized Zn0.5Cd0.5S-1%Ni3C(ZCS-1)heterojunction/homojunction nanohybrid exhibited the highest photocatalytic H2-evolution rate of 783μmol h‒1 under visible light,which is 2.88 times higher than that of pristine twin nanocrystal ZCS solid *** apparent quantum efficiencies of ZCS and ZCS-1 are measured to be 6.13%and 19.25%at 420 nm,***,the homojunctions between the zinc blende and wurtzite segments in twin nanocrystal ZCS solid solution can significantly improve the light absorption and separation of photogenerated electron-hole ***,the heterojunction between ZCS and metallic Ni3C NP cocatalysts can efficiently trap excited electrons from ZCS solid solution and enhance the H2-evolution kinetics at the surface for improving catalytic *** study demonstrates a unique one-step strategy for constructing heterojunction/homojunction hybrid nanostructures for a more efficient photocatalytic H2 evolution compared to other noble metal photocatalytic systems.

关键词： Photocatalytic H2 evolution Zn0.5Cd0.5S solid solution Twin nanocrystal Heterojunction/homojunction Earth-abundant Ni3C cocatalysts

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Unravelling charge carrier dynamics in protonated g-C3N4 interfaced with carbon nanodots as co-catalysts toward enhanced photocatalytic CO2 reduction： A combined experimental and first-principles DFT study

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Nano Research 2017年第5期10卷 1673-1696页

作者： Wee-Jun Ong Lutfi Kurnianditia Putri Yoong-Chuen Tan Lling-Lling Tan Neng Li yun hau ng Xiaoming Wen Siang-Piao Chai Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A'STAR) 2 Fusionopolis Way Innovis Singapore 138534 Singapore Multidisciplinary Platform of Advanced Engineering Chemical Engineering Discipline School of Engineering Monash University Jalan Lagoon Selatan Bandar Sunway 47500 Selangor Malaysia Chemical Engineering School of Engineering and Physical Sciences Heriot-Watt University Jalan Venna PS/2 Precinct 5 62200 Putrajaya Malaysia State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China Particles and Catalysis Research Group (PARTCAT) School of Chemical Engineering The University of New South Wales Sydney New South Wales 2052 Australia Australian Centre for Advanced Photovoltaics School of Photovoltaic and Renewable Energy Engineering The University of New South Wales Sydney New South Wales 2052 Australia

In this work, we demonstrated the successful construction of metal-free zero- dimensional/two-dimensional carbon nanodot （CND）-hybridized protonatedg=C3N4 （pCN）（CND/pCN） heterojunction photocatalysts b; means of electrostatic attraction. We experimentally found that CNDs with an average diameter of 4.4 nm were uniformly distributed on the surface of pCN using electron microscopy analysis. The CND/pCN-3 sample with a CND content of 3 wt.% showed thehighest catalytic activity in the CO2 photoreduction process under visible and simulated solar light. This process results in the evolution of CH4 and CO. Thetotal amounts of CH4 and CO generated by the CND/pCN-3 photocatalyst after 10 h of visible-light activity were found to be 29.23 and 58.82 molgcatalyst-1, respectively. These values were 3.6 and 2.28 times higher, respectively, than thearn＊ounts generated when using pCN alone. The corresponding apparent quantum efficiency （AQE） was calculated to be 0.076%. Furthermore, the CND/pCN-3 sample demonstrated high stability and durability after four consecutive photoreaction cycles, with no significant decrease in the catalytic activity.

关键词： protonated graphiticcarbon nitride carbon nanodots photocatalysis carbon dioxide reduction charge carrier dynamics density functional theory(DFT) calculations

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