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Photodeposition of CoOx and MoS2 on CdS as dual cocatalysts for photocatalytic h2 production

Journal of Materials Science & Technology 2022年第29期124卷 209-216页

作者： Tingmin Di Quanrong Deng Geming Wang Shenggao Wang Linxi Wang Yuhua Ma hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China College of Chemistry and Chemical Engineering Xinjiang Normal UniversityUrumqi 830054China

photocatalytic hproduction from water splitting has a promising prospect for alleviating energy and environmental issues.however,the fast recombination of photogenerated charge carriers limits the photocatalytic efficiency and its practical application.Cocatalyst engineering is an effective strategy to spatially separate photogenerated charge carriers.In this work,noble-metal-free MoSand CoOcocatalysts are loaded on CdS nanorods by a two-step photodeposition method.The MoSfunctions as the reduction cocatalyst to trap electrons and Co Oas the oxidation cocatalyst to trap holes.Transmission electron microscopy(TEM),inductively coupled plasma(ICP),X-ray photoelectron spectroscopy(XPS)and MottSchottky results demonstrate the effectiveness of photodeposition for loading MoSand CoOdual cocatalysts on CdS and their impact on the photochemical properties.The optimized CdS-MoS-CoOcomposite exhibits a high photocatalytic h-production rate of 7.4 mmol g^(-1)h^(-1)and an apparent quantum efficiency(QE)of 7.6%at 420 nm.Further analysis on time-resolved photoluminescence(TRPL)indicates that the introduction of dual cocatalysts greatly prolongs the lifetime of photogenerated charge carriers and deceases the charge recombination rates,consequently leading to superior photocatalytic h-production performance.This work provides a facile and effective strategy for the construction of highly efficient dual-cocatalyst-modified CdS photocatalyst for high-performance photocatalytic hproduction.

关键词： photocatalytic h2 production CdS Dual cocatalysts MoS2 CoOx Photodeposition

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Oxygen-rich carbon-nitrogen quantum dots as cocatalysts for enhanced photocatalytic h2 production activity of TiO2 nanofibers

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Progress in Natural Science:Materials International 2017年第5期27卷 333-337页

作者： Zhiyan Chen Yishang Wu Qichen Wang Zhiyong Wang Lihua he Yongpeng Lei Zhongmin Wang School of Materials Science and Engineering Central South University of Forestry and Technology AVIC Beijing Institute of Aeronautical Materials College of Basic Education National University of Defense Technology School of Aeronautics and Astronautics Central South University Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology

We developed an one-step hydrothermal method to synthesize carbon-nitrogen quantum dots(CNQDs) with oxygen-rich functional groups.The sample was characterized by TEM,AFM,FT-IR,XPS,UV-vis absorption and PL spectra.The 0/C and N/C atomic ratio of typical CNQDs with diameters of 3-6 nm are ca.0.4 and 0.2,respectively.Without noble metal cocatalyst,the photocatalytic h2production rate of CNQDs/TiO2nanofibers(NFs)(112.4 μmol h-1g-1) is 1.8 times higher than that of TiO2NFs.The good absorption of light contributes to the enhanced photocatalytic h2performance.The CNQDs could be promising in biomedical imaging,optical data recording storage and photo/electrocatalysis,etc.

关键词： photocatalytic h2 production TiO2 Nanofibers Quantum dots

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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 irradiation.In this review,we first elaborated on the fundamental aspects of 2D MoS_(2) cocatalysts to include the structural design principles,synthesis strategies,strengths and challenges.Subsequently,we thoroughly highlighted and discussed the modification strategies of 2D MoS_(2) h2-evolution cocatalysts,including doping heteroatoms(e.***.metals,non-metals,and co-doping),designing interfacial coupling morphologies,controlling the physical properties(e.***.thickness,size,structural defects or pores),exposing the reactive facets or edge sites,constructing cocatalyst heterojunctions,engineering the interfacial bonds and confinement effects.In 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 proposed.The applications of MoS_(2) cocatalyst in the overall water splitting are also expected.This 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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photocatalytic h2 Evolution on TiO2 Assembled with Ti3C2 MXene and Metallic 1T-WS2 as Co-catalysts

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Nano-Micro Letters 2020年第1期12卷 63-74页

作者： Yujie Li Lei Ding Shujun Yin Zhangqian Liang Yanjun Xue Xinzhen Wang hongzhi Cui Jian Tian School of Materials Science and Engineering Shandong University of Science and Technology

The biggest challenging issue in photocatalysis is efficient separation of the photoinduced carriers and the aggregation of photoexcited electrons on photocatalyst’s surface.In this paper,we report that double metallic co-catalysts Ti3C2 MXene and metallic octahedral(1T)phase tungsten disulfide(WS2)act pathways transferring photoexcited electrons in assisting the photocatalytic h2 evolution.TiO2 nanosheets were in situ grown on highly conductive Ti3C2 MXenes and 1T-WS2 nanoparticles were then uniformly distributed on TiO2@Ti3C2 composite.Thus,a distinctive 1T-WS2@TiO2@Ti3C2 composite with double metallic co-catalysts was achieved,and the content of 1T phase reaches 73%.The photocatalytic h2 evolution performance of 1T-WS2@TiO2@Ti3C2 composite with an optimized 15 wt%WS2 ratio is nearly 50 times higher than that of TiO2 nanosheets because of conductive Ti3C2 MXene and 1T-WS2 resulting in the increase of electron transfer efficiency.Besides,the 1T-WS2 on the surface of TiO2@Ti3C2 composite enhances the Brunauer–Emmett–Teller surface area and boosts the density of active site.

关键词： photocatalytic h2 production Ti3C2 MXene Octahedral phase WS2 TiO2 nanosheets Co-catalysts

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highly Selective photocatalytic Conversion of Glucose on holo-Symmetrically Spherical Three-Dimensionally Ordered Macroporous heterojunction Photonic Crystal

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CCS Chemistry 2023年第8期5卷 1773-1788页

作者： Ting-Wei Wang Zhi-Wen Yin Yin-hao Guo Fang-Yuan Bai Jun Chen Wenda Dong Jing Liu Zhi-Yi hu Lihua Chen Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 Wuhan Nanostructure Research Centre(NRC) Wuhan University of Technology430070 Wuhan Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 Namur

photocatalytic conversion of biomass is considered an effective,clean,and environmentally friendly route to obtain high-valued chemicals and hydrogen.however,the limited conversion efficiency and poor selectivity are still the main bottlenecks for photocatalytic biomass conversion.herein,we report the highly selective photocatalytic conversion of glucose solution on holosymmetrically spherical three-dimensionally ordered macroporous TiO_(2)-CdSe heterojunction photonic crystal structure(s-TCS).The obtained s-TCS photocatalysts show excellent stability and strong light harvesting,uniform mass diffusion and exchange,and efficient photogenerated electrons/holes separation and utilization.The optimized s-TCS-4 photocatalyst displays the highest photocatalytic performance for glucose oxidation and hydrogen production.The glucose conversion,lactic acid selectivity,and yield on s-TCS-4 are about 95.9%,94.3%,and 96.4%,respectively.The photocatalytic production of lactic acid for s-TCS-4(18.5 g/L)is 2.3 times higher than the pure spherical TiO_(2) photonic crystal without CdSe(s-TiO_(2),8.1 g/L),and the hydrogen production rate of s-TCS-4 is 9.4 times that of s-TiO_(2).For the first time,we reveal that the photocatalytic conversion of glucose to lactic acid is a third-order and four-electron-involved reaction.This work could shed some new light on the efficient photocatalysis conversion of biomass to highly value-added products with high selectivity and yield,and simultaneously sustainable hydrogen evolution.

关键词： TiO_(2)-CdSe heterojunction spherical photonic crystal high-selective photocatalytic glucose conversion lactic acid photocatalytic h2 production four-electron involved reaction third-order reaction

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Slow Photon-Enhanced heterojunction Accelerates photocatalytic hydrogen Evolution Reaction to Unprecedented Rates

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CCS Chemistry 2023年第2期5卷 372-384页

作者： Jing Liu Yin-hao Guo Zhi-Yi hu heng Zhao Ze-Chuan Yu Lihua Chen Yu Li Gustaaf Van Tendeloo Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 Wuhan Nanostructure Research Centre(NRC) Wuhan University of Technology430070 Wuhan School of Civil Engineering and Architecture Wuhan University of Technology430070 Wuhan EMAT University of AntwerpB-2020 Antwerp Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 Namur

In photocatalysis,both the photogenerated charge separation and transport and the induced light utilization greatly influence performance.In this work,highly ordered CdS@ZnO core-shell inverse opal(CdS@ZnO-csIO)nanocomposites have been successfully designed as a model to couple the heterojunction system with the slow photon effect for photocatalytic h2 production.Theoretical calculations and experimentation provide direct evidence for the slow photon effect in the CdS@ZnO-csIO nanocomposites.The type II heterojunction is responsible for promoting the migration and separation of photogenerated charges,and the slow photon effect is in charge of enhancing light harvesting in the CdS@ZnO-csIO nanocomposites.This synergy of two functions gives rise to a significantly enhanced photocatalytic h2 production rate under simulated solar light for the CdS@ZnO-csIO nanocomposites.The highest h2 production rate reaches 48.7 mmol g^(−1)h^(−1)under simulated solar light with the benchmark performance for all reported CdS@ZnO composites.Our work provides proof-of-principle that coupling the heterojunction system with the slow photon effect can greatly enhance the photocatalytic activity of composite photocatalysts.

关键词： type II heterojunction slow photon effect CdS@ZnO nanocomposites 3D core-shell inverse opal nanocomposites photocatalytic h2 production

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TiO2-based materials for photocatalytic hydrogen production

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Journal of Energy Chemistry 2017年第2期26卷 250-258页

作者： G.L.Chiarello M.V.Dozzi E.Selli Dipartimento di Chimica Universitàdegli Studi di MilanoVia Golgi 19I-20133 MilanoItaly

hydrogen, the cleanest and most promising energy vector, can be produced by solar into chemical energy conversion, either by the photocatalytic direct splitting of water into hand O, or, more efficiently,in the presence of sacrificial reagents, e.g., in the so-called photoreforming of organics. Efficient photocatalytic materials should not only be able to exploit solar radiation to produce electron–hole pairs, but also ensure enough charge separation to allow electron transfer reactions, leading to solar energy driven thermodynamically up-hill processes. Recent achievements of our research group in the development and testing of innovative TiO-based photocatalytic materials are presented here, together with an overview on the mechanistic aspects of water photosplitting and photoreforming of organics. photocatalytic materials were either（i） obtained by surface modification of commercial photocatalysts, or produced（ii） in powder form by different techniques, including traditional sol gel synthesis, aiming at engineering their electronic structure, and flame spray pyrolysis starting from organic solutions of the precursors, or（iii） in integrated form, to produce photoelectrodes within devices, by radio frequency magnetron sputtering or by electrochemical growth of nanotube architectures, or photocatalytic membranes, by supersonic cluster beam deposition.

关键词： photocatalytic h2 production Photo steam reforming Flame spray pyrolysis Nanotubes Noble metal nanoarticles photocatalytic devices

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highly efficient single-crystalline NaNb_(1-X)Ta_(X)O_(3)(X=0.125)wires:The synergistic effect of tantalum-doping and morphology on photocatalytic hydrogen evolution

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Journal of Materials Science & Technology 2020年第19期54卷 20-30页

作者： Qianqian Liu Quan Zhang Lu Zhang Wei-Lin Dai School of Chemistry Biology and Materials EngineeringSuzhou University of Science and TechnologySuzhou 215009China Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200433China

For the first time in this work,we manage to synthesize single-crystalline NaNb_(0.875)Ta_(0.125)O_(3) wires by combining the advantages of one-dimensional(1 D)nanostructure and heteroatom doping strategy.Careful Ta doping was performed to figure out the correlation between morphological and structural evolution as well as the photocatalytic performance towards h2 generation.It was found that,the as-prepared NaNb_(0.875)Ta_(0.125)O_(3) wires presented a highest and stable photocatalytic performance,which was appropriately 41 and 2 folds higher than that of bare Na TaO_(3) and Na NbO3.The optical activity was mainly ascribed to the synergistic effect between appropriate Ta doping and perfect 1 D wire-like morphology,which resulted in fewer defects,improved charge transfer efficiency and higher reduction capability of electrons.On the other hand,a possible photocatalytic mechanism of photocatalytic h_(2) production was proposed in detail.This work creates a new perspective into designing multi-component materials and understanding the mechanism of h_(2) evolution,which offers new opportunities for solar-energy conversion.

关键词： NaNb_(0.875)Ta_(0.125)O_(3)wires Single crystal Ta-doping effect photocatalytic h2 production Mechanism

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