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Spontaneous photoelectric field-enhancement effect prompts the low cost hierarchical growth of highly ordered heteronanostructures for solar water splitting

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Nano Research 2016年第6期9卷 1561-1569页

作者： Yankuan Wei Jinzhan Su XiaokangWan Liejin Guo Lionel Vayssieres International Research Center for Renewable Energy State Key Laboratory for Multiphase Flow in Power Engineering School of Energy &Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In this study, a potentially universal new strategy is reported for the large-scale, low-cost fabrication of visible-light-active highly ordered heteronanostructures based on the spontaneous photoelectric-field-enhancement effect inherent in pyramidal morphology. The hierarchical vertically oriented arrayed structures comprise an active molecular co-catalyst at the apex of a visible-light-active large band gap semiconductor for low-cost solar water splitting in a neutral aqueous medium without the use of a sacrificial agent.

关键词： bismuth vanadate co-catalysts photocatalysis solar water splitting oxygen evolution

Plasmon-enhanced solar water splitting with metal oxide nanostructures： A brief overview of recent trends

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Frontiers of Materials Science 2018年第3期12卷 207-213页

作者： Timur Sh. ATABAEV Department of Chemistry School of Science and Technology Nazarbayev University Astana 010000 Kazakhstan

In the last decade, the surface plasmon resonance-enhanced solar water splitting （SWS） has been actively investigated for improved hydrogen production. In this mini-review, we briefly introduce the mechanisms for plasmon-enhanced SWS and then review some representative studies related to these mechanisms. In addition, we also briefly discuss how metal oxide geometry affects the SWS activity in combined metalsemiconductor nanostructures. Finally, we summarize the recent discoveries and proposed a future vision for plasmon-enhanced SWS with metal oxide nanostructures.

关键词： surface plasmon resonance solar water splitting nanostructures noble metals metal oxides

Electrochemical creation of surface charge transfer channels on photoanodes for efficient solar water splitting

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Chinese Journal of Catalysis 2022年第9期43卷 2342-2353页

作者： Zhiwei Li Huiting Huang Wenjun Luo Yingfei Hu Rongli Fan Zhi Zhu Jun Wang Jianyong Feng Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing210093JiangsuChina School of Physics Nanjing UniversityNanjing 210093JiangsuChina

Electrochemical treatment is a popular and efficient method for improving the photoelectrochemical performance of water‐splitting *** our previous study,the electrochemical activation of Mo‐doped BiVO_(4) electrodes was ascribed to the removal of MoO_(x) segregations,which are considered to be surface recombination centers for photoinduced electrons and ***,this proposed mechanism cannot explain why activated Mo‐doped BiVO_(4) electrodes gradually lose their activity when exposed to *** this study,based on various characterizations,it is suggested that electrochemical treatment not only removes partial MoO_(x) segregations but also initiates the formation of H_(y)MoO_(x) surface defects,which provide charge transfer channels for photogenerated *** charge separation of the Mo‐doped BiVO_(4) electrode was significantly enhanced by these charge transfer *** study offers a new insight into the electrochemical activation of Mo‐doped BiVO_(4) photoanodes,and the new concept of surface charge transfer channels,a long overlooked factor,will be valuable for the development of other(photo)electrocatalytic systems.

关键词： solar water splitting Photoelectrochemical cell Electrochemical treatment Charge transfer channel Mo-doped BiVO4

Engineering the heterogeneous interfaces of inverse opals to boost charge transfer for efficient solar water splitting

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Science China Materials 2022年第1期65卷 124-130页

作者： Miaomiao Zhang Pianpian Liu Hao Tan Hui Zhang Fangzhi Huang Kun Zhang Shikuo Li Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University)Ministry of EducationSchool of Chemistry and Chemical EngineeringInstitute of Physical Science and Information TechnologyAnhui UniversityHefei 230601China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Bengbu Institute of Product Quality Supervision and Inspection Research Bengbu 233040China

Herein,we report a three-dimensional porous TiO_(2)/Fe_(2)TiO_(5)/Fe_(2)O_(3)(TFF)inverse opal through in situ thermal solid reactions for photoelectrochemical water *** Fe_(2)TiO_(5) interfacial layer within TFF acting as a bridge to tightly connect to TiO_(2) and Fe_(2)O_(3) reduces the interfacial charge transfer resistance,and suppresses the bulk carrier *** optimized TFF displays a remarkable photocurrent density of 0.54mAcm^(-2) at 1.23V *** hydrogen electrode(RHE),which is 25 times higher than that of TiO_(2)/Fe_(2)O_(3)(TF)inverse opal(0.02mAcm^(-2) at 1.23V ***).The charge transfer rate in TFF inverse opal is 2-8 times higher than that of TF in the potential range of 0.7-1.5V *** effects of the Fe_(2)TiO_(5) interfacial layer are further revealed by X-ray absorption spectroscopy and intensity-modulated photocurrent *** work offers an interfacial engineering protocol to improve charge separation and transfer for efficient solar water splitting.

关键词： interfacial engineering heterojunction transfer resistance inverse opal solar water splitting

The application of perovskite materials in solar water splitting

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Journal of Semiconductors 2020年第1期41卷 39-55页

作者： Yanbin Huang Jun Liu Yanchun Deng Yuanyuan Qian Xiaohao Jia Mengmeng Ma Cheng Yang Kong Liu Zhijie Wang Shengchun Qu Zhanguo Wang Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Mathematical Science and Engineering Hebei University of EngineeringHandan 056038China College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China Anhui Key Laboratory of Chemo/Biosensing College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

solar water splitting is a promising strategy for sustainable production of renewable hydrogen,and solving the crisis of energy and environment in the ***,large-scale application of this method is hampered by the efficiency and the expense of the solar water splitting *** for non-toxic,low-cost,efficient and stable photocatalysts is an important way for solar water *** to the simplicity of structure and the flexibility of composition,perovskite based photocatalysts have recently attracted widespread attention for application in solar water *** this review,the recent developments of perovskite based photocatalysts for water splitting are *** introduction including the structures and properties of perovskite materials,and the fundamentals of solar water splitting is first ***,it specifically focuses on the strategies for designing and modulating perovskite materials to improve their photocatalytic performance for solar water *** current challenges and perspectives of perovskite materials in solar water splitting are also *** aim of this review is to summarize recent findings and developments of perovskite based photocatalysts and provide some useful guidance for the future research on the design and development of highly efficient perovskite based photocatalysts and the relevant systems for water splitting.

关键词： solar water splitting perovskite materials photocatalyst

Photoelectrochemical evaluation of SILAR-deposited nanoporous BiVO4 photoanodes for solar-driven water splitting

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Nano Materials Science 2020年第3期2卷 227-234页

作者： Siti Nur'ain Haji Yassin Adrian Soong Leong Sim James Robert Jennings Faculty of Science Universiti Brunei DarussalamJalan Tungku LinkBE 1410Brunei Darussalam

We report a photoelectrochemical investigation of BiVO4 photoanodes prepared by successive ionic layer adsorption and reaction(SILAR),a facile method that yields uniform nanoporous *** characterization of the phase,morphology,composition,and optical properties of the prepared films,the efficiencies of charge separation(ηsep)and water oxidation(ηox)in solar water splitting cells employing these photoanodes were estimated following a previously reported *** wavelength and illumination direction dependencies were discovered in the derived efficiencies,casting doubt on the validity of the *** alternative approach using a diffusion–reaction model that explicitly considers the efficiency of electron collection resolved the discrepancies and explained the illumination direction dependence of the *** diffusion lengths(Ln)of 0.45μm and 0.55μm were derived for pristine and cobalt phosphate(Co-Pi)modified BiVO4,respectively,which are much shorter than the film thickness of^2.1μ*** Co-Pi treatment also increasedηoxfrom 0.86 to^1,which is the main reason for the overall performance enhancement caused by adding *** findings suggest that there is little scope for improving the performance of SILAR-deposited BiVO4 photoanodes by further catalyzing water oxidation,but enhanced performance is achievable if electron transport can be improved.

关键词： Bismuth vanadate BiVO4 solar water splitting Electron diffusion length Charge collection efficiency water oxidation efficiency Charge separation efficiency

Two-dimensional perovskite SrNbO_(2) N with Zr doping for accelerating photoelectrochemical water splitting

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Journal of Materials Science & Technology 2023年第11期142卷 176-184页

作者： Thanh Tam Thi Tran Van-Huy Trinh Jeongsuk Seo Department of Chemistry College of Natural SciencesChonnam National University77 Yongbong-roBuk-guGwangju 61186South Korea

The superior ability of perovskite-type SrNbO_(2) N to absorb intensive visible light makes it a potential semiconductor to produce hydrogen and oxygen by photoelectrochemical(PEC)water splitting under *** surface morphologies,such as shape and structure,of the oxynitride strongly affect its photoactivity,although the mechanism has been hardly ***,we report a two-dimensional(2D)porous SrNbO_(2) N plate with Zr doping,nitrided from layered perovskite Sr_(5)Nb_(4)O_(15) and also its largely enhanced PEC water splitting ***^(4+)was doped in Sr_(5)Nb_(4)O_(15) during flux-assisted calcination using KCl,producing 2D-type truncated-octahedral Sr_(5)Nb_(4)O_(15):Zr plates approximately 50 nm in *** nitridation completely transformed Sr_(5)Nb_(4)O_(15):Zr to 2D single-crystalline SrNbO_(2) N:Zr with a large surface area,which was subsequently used to fabricate a thin and uniform photoanode by the spin coating *** a result,the Co(OH)_(x)/SrNbO_(2) N:Zr/FTO photoanode capable of absorbing visible light of up to 680 nm exhibited an activity of 2.0 mA cm^(-2) at 1.23 V vs the reversible hydrogen electrode for water splitting under AM 1.5G simulated *** improvement in photoactivity mainly originated from the 2D surface morphology of SrNbO_(2) N:Zr,which is clearly distinguishable from 3D-type *** to electrochemical analyses,the 2D structure of SrNbO_(2) N:Zr boosted the separation and accelerated the transfer of charges photogenerated during the water splitting,thus driving the reaction ***,the result empirically demonstrates that controlling the surface morphology of SrNbO_(2) N is an effective strategy to suppress the recombination of charges and minimize their diffusion pathway,eventually enhancing the PEC activity.

关键词： solar water splitting water oxidation BaNbO_(2)N Doping engineering Flux-assisted calcination Spin coating

Recent Advancements in Photoelectrochemical water splitting for Hydrogen Production

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Electrochemical Energy Reviews 2023年第1期6卷 357-402页

作者： Yibo Zhao Zhenjie Niu Jiwu Zhao Lan Xue Xianzhi Fu Jinlin Long State Key Laboratory of Photocatalysis On Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116FujianChina

Sunlight is the most abundant and inexhaustible energy source on ***,its low energy density,dispersibility and intermittent nature make its direct utilization with industrial relevance challenging,suggesting that converting sunlight into chemical energy and storing it is a valuable measure to achieve global sustainable ***–neutral,clean and secondary pollution-free solar-driven water splitting to produce hydrogen is one of the most attractive avenues among all the current options and is expected to realize the transformation from dependence on fossil fuels to zero-pollution *** photosynthetic systems(APSs)based on photoelectrochemical(PEC)devices appear to be an ideal avenue to efficiently achieve solar-to-hydrogen *** this review,we comprehensively highlight the recent developments in photocathodes,including architectures,semiconductor photoabsorbers and performance optimization *** particular,frontier research cases of organic semiconductors,dye sensitization and surface grafted molecular catalysts applied to APSs based on frontier(molecular)orbital theory and semiconductor energy band theory are ***,research advances in typical photoelectrodes with the metal–insulator–semiconductor(MIS)architecture based on quantum tunnelling are also ***,we discuss the benchmarks and protocols for designing integrated tandem photoelectrodes and PEC systems that conform to the solar spectrum to achieve high-efficiency and cost-effective solar-to-hydrogen conversion at an industrial scale in the near future.

关键词： Photoelectrochemical(PEC)cells solar water splitting Photocathodes Semiconductors Metal-insulator-semiconductor(MIS)heterostructure Tandem photoelectrodes

Heterojunction between bimetallic metal-organic framework and TiO_(2):Band-structure engineering for effective photoelectrochemical water splitting

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Nano Research 2022年第9期15卷 8502-8509页

作者： Ji Won Yoon Jae-Hyeok Kim Young-Moo Jo Jong-Heun Lee Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea

Bimetallic Fe/Ni-based metal-organic frameworks(MOFs)with different Fe/Ni ratios were coated on TiO_(2)nanorods(NRs),and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were *** bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni *** ideal band alignment was achieved between the TiO_(2)NRs and bimetallic MOFs with an optimum ratio of[Fe]/[Ni]=0.25/0.75,which allowed efficient light absorption and charge *** coating of NH_(2)-MIL(Fe)-88 layer on the TiO_(2)NRs decreased the photocurrent density by 33%.In comparison,TiO_(2)/NH_(2)-MIL(Ni)-88 showed a modest improvement in photocurrent density(0.85 mA·cm^(−2)at 1.23 V vs.a reversible hydrogen electrode(RHE)).When bimetallic NH_(2)-MIL(Fe_(0.25)Ni_(0.75))-88 was coated on the TiO_(2)NRs,the photocurrent density reached 1.56 mA·cm^(−2),which was an efficiency enhancement of 3.2 *** mechanism underlying high photoelectrochemical performance was investigated.

关键词： band-structure engineering bimetallic metal-organic frameworks(MOFs) solar water splitting TiO_(2)nanorods NH_(2)-MIL-88