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Vacancy engineering mediated hollow structured ZnO/ZnS S-scheme heterojunction for highly efficient photocatalytic h2 production

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Chinese Journal of Catalysis 2024年第9期64卷 152-165页

作者： Fangxuan Liu Bin Sun Ziyan Liu Yingqin Wei Tingting Gao Guowei Zhou Key Laboratory of Fine Chemicals in Universities of Shandong Jinan Engineering Laboratory for Multi‐scale Functional MaterialsSchool of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353ShandongChina Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264006ShandongChina

Designing a step-scheme(S-scheme)heterojunction photocatalyst with vacancy engineering is a reliable approach to achieve highly efficient photocatalytic h_(2)production ***,a hollow ZnO/ZnS S-scheme heterojunction with O and Zn vacancies(VO,Zn-ZnO/ZnS)is rationally constructed via ion-exchange and calcination *** such a photocatalytic system,the hollow structure combined with the introduction of dual vacancies endows the adequate light ***,the O and Zn vacancies serve as the trapping sites for photo-induced electrons and holes,respectively,which are beneficial for promoting the photo-induced carrier ***,the S-scheme charge transfer mechanism can not only improve the separation and transfer efficiencies of photo-induced carrier but also retain the strong redox *** expected,the optimized VO,Zn-ZnO/ZnS heterojunction exhibits a superior photocatalytic h_(2)production rate of 160.91 mmol g^(-1)h^(-1),approximately 643.6 times and 214.5 times with respect to that obtained on pure ZnO and ZnS,***,the experimental results and density functional theory calculations disclose that the photo-induced carrier transfer pathway follows the S-scheme heterojunction mechanism and the introduction of O and Zn vacancies reduces the surface reaction *** work provides an innovative strategy of vacancy engineering in S-scheme heterojunction for solar-to-fuel energy conversion.

关键词： hollow structure ZnO/ZnS S-scheme heterojunction Vacancy engineering photocatalytic h2 production

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

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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 ***,the fast recombination of photogenerated charge carriers limits the photocatalytic efficiency and its practical *** engineering is an effective strategy to spatially separate photogenerated charge *** this work,noble-metal-free MoSand CoOcocatalysts are loaded on CdS nanorods by a two-step photodeposition *** MoSfunctions as the reduction cocatalyst to trap electrons and Co Oas the oxidation cocatalyst to trap *** 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 *** 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 *** 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 *** 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3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 *** sample was characterized by TEM,AFM,FT-IR,XPS,UV-vis absorption and PL *** 0/C and N/C atomic ratio of typical CNQDs with diameters of 3-6 nm are ca.0.4 and 0.2,*** 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 *** good absorption of light contributes to the enhanced photocatalytic *** 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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ZnxCd1–xS quantum dot with enhanced photocatalytic h2-production performance

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Chinese Journal of Catalysis 2021年第1期42卷 15-24页

作者： Rongrong Gao Bei Cheng Jiajie Fan Jiaguo Yu Wingkei ho State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Department of Science and Environmental Studies The Education University of Hong KongHong KongChina

h2 is an important energy carrier for replacing fossil fuel in the future due to its high energy density and environmental *** a sustainable h2-generation method,photocatalytic h2 production by water splitting has attracted much ***,oil-soluble ZnxCd1-xS quantum dot(ZCS QD)with a uniform particle size distribution were prepared by a hot-injection ***,no photocatalytic h2-production activity was observed for the oil-soluble ZCS QD due to its ***,the oil-soluble ZCS QD was converted into a water-soluble ZCS QD by a ligand-exchange *** water-soluble ZCS QD exhibited excellent photocatalytic h2-production performance in the presence of glycerin and Ni^2+,with an apparent quantum efficiency of 15.9%under irradiation of 420 nm ***,the photocatalytic h2-generation activity of the ZCS QD was~10.7 times higher than that of the ZnxCd1-xS relative samples prepared by the conventional co-precipitation *** work will inspire the design and fabrication of other semiconductor QD photocatalysts because QD exhibits excellent separation efficiency for photogenerated electron-hole pairs due to its small crystallite size.

关键词： ZnxCd1-xS Solid-solution photocatalyst photocatalytic h2 production Oil-soluble quantum dot Water-oil soluble quantum dot

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Building surface defects by doping with transition metal on ultrafine TiO_2 to enhance the photocatalytic h_2 production activity

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Chinese Journal of Catalysis 2018年第3期39卷 542-548页

作者： Qi‐Feng Liu Qian Zhang Bing‐Rui Liu Shiyou Li Jing‐Jun Ma College of Science and Technology Agricultural University of Hebei Huanghua 061100 Hebei China hunan Provincial Key Laboratory of Pollution Control and Resources Technology University of South China Hengyang 421001 Hunan China hebei Agricultural Products Processing Engineering Technology Research Center Baoding 071001 Hebei China

Inefficient charge separation and limited light absorption are two critical issues associated with high‐efficiency photocatalytic h2production using *** defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic *** this study,surface defects(oxygen vacancies and metal cation replacement defects)were induced with a facile and effective approach by surface doping with low‐cost transition metals(Co,Ni,Cu,and Mn)on ultrafine *** obtained surface‐defective TiO2exhibited a3–4‐fold improved activity compared to that of the original ultrafine *** addition,a h2production rate of3.4μmol/h was obtained using visible light(λ>420nm)*** apparent quantum yield(AQY)at365nm reached36.9%over TiO2‐Cu,significantly more than the commercial *** enhancement of photocatalytic h2production activity can be attributed to improved rapid charge separation efficiency andexpanded light absorption *** hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.

关键词： Construction of surface defects Ultrafine TiO2 Low‐cost transition metal Surface doping photocatalytic h2 production

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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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Precisely decorating CdS on Zr-MOFs through pore functionalization strategy: A highly efficient photocatalyst for h2 production

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Chinese Journal of Catalysis 2022年第9期43卷 2332-2341页

作者： haijun hu Kailai Zhang Ge Yan Litong Shi Baohua Jia hongwei huang Yu Zhang Xiaodong Sun Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced MaterialsCollege of ChemistryLiaoning UniversityShenyang 110036LiaoningChina Centre for Translational Atomaterials Swinburne University of TechnologyHawthornVictoria 3122Australia Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China

Different materials,such as metal sulphides,are often combined with metal‐organic frameworks(MOFs)to develop multi‐functional composites and improve their photocatalytic ***,the high interfacial energy barrier limits the formation and nano‐assembly of the heterogeneous junctions between MOFs and metal ***,the heterostructured Zr‐MOF‐S@CdS are successfully constructed through a sequential synthesis method,in which the mesoporous Zr‐MOF are firstly decorated with thioglycolic acid through pore functionalization,and followed by the S^(2-)anion exchange process resulting in the surface close attached growth of CdS onto Zr‐MOF‐S *** to the presence of molecules linkers,the CdS can be precisely decorated onto Zr‐MOF‐S without aggregation,which can provide more active ***,the intimate connections and the suitable band structures between two materials can also facilitate the photogenerated electron‐hole pairs ***,the resulting Zr‐MOF‐S@CdS with appropriate ratio exhibits high photocatalytic activity for water reduction,in which the h_(2) evolution rate can reach up to 1861.7μmol·g^(‒1)·h^(‒1),4.5 times higher than pure CdS and 2.3 times higher than of Zr‐MOF/CdS,*** the promising future of MOF‐based photocatalysts,this work may provide an avenue for the further design and synthesis MOF‐based composite photocatalysts for efficient h_(2) evolution.

关键词： Zr-MOF Pore functionalization photocatalytic h2 production Molecular linker Junction

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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 *** 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 ***2 nanosheets were in situ grown on highly conductive Ti3C2 MXenes and 1T-WS2 nanoparticles were then uniformly distributed on TiO2@Ti3C2 ***,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 ***,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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Slow photons for solar fuels

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Chinese Journal of Catalysis 2018年第3期39卷 379-389页

作者： Xiuzhen Zheng Yang Yang Shifu Chen Liwu Zhang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and Engineering Fudan UniversityShanghai 200433 China College of Chemistry and Material Science Huaibei Normal University Huaibei 235000 Anhui China

Converting solar energy into hydrogen and hydrocarbon fuels through photocatalytic h2production and CO2photoreduction is a highly promising approach to address growing demand for clean andrenewable energy ***,solar‐to‐fuel conversion efficiencies of current photocatalysts are not sufficient to meet commercial *** narrow window of solar energy that can be used has been identified as a key reason behind such low photocatalytic reaction *** use of photonic crystals,formed from multiple material components,has been demonstrated to be an effective way of improving light *** these nanostructures,the slow‐photon effect,a manifestation of light‐propagation control,considerably enhances the interaction between light and the semiconductor *** article reviews recent developments in the applications of photonic crystals to photocatalytic h2production and CO2reduction based on slow *** advances show great promise for improving light harvesting in solar‐energy conversion technologies.

关键词： Photonic crystal Slow photons Inverse opal Water splitting photocatalytic h2 production CO2 photoreduction

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Synergistic effect of Co（Ⅱ）-hole and Pt-electron cocatalysts for enhanced photocatalytic hydrogen evolution performance of P-doped g-C3N4

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Chinese Journal of Catalysis 2020年第1期41卷 72-81页

作者： Kouhua Sun Jun Shen Qinqin Liu hua Tang Mingyi Zhang Syed Zulfiqar Chunsheng Lei School of Environment&Safety Engineering Changzhou UniversityChangzhou 213164JiangsuChina School of Pharmacy Suzhou Vocational Health CollegeSuzhou 215009JiangsuChina School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationHarbin Normal UniversityHarbin 150025HeilongjiangChina

g-C3N4 is a metal-free semiconductor and a potential candidate for photocatalytic h2 production,however,the drawbacks,rapid recombination rate and limited migration efficiency of photogenerated carriers,restrict its photocatalytic ***,Co(II)as a hole cocatalyst modified P-doped g-C3N4 were successfully prepared to ameliorate the separation efficiency of photoinduced carriers and enhance the photocatalytic hydrogen *** photocatalytic results demonstrated that the P-doped g-C3N4(PCN)exhibited higher photocatalytic activity compared with pure g-C3N4,while Co(II)/PCN photocatalyst exhibited further enhancement of photocatalytic *** proposed possible mechanism based on various characterizations is that P-doping can modulate the electronic structure of g-C3N4 to boost the separation of photogenerated-e-and h+;while the synergistic effect of both Co(II)(as hole cocatalyst)and Pt(as electron cocatalyst)can not only lead to the directional shunting of photogenerated e+-h?pairs,but further accelerate the photogenerated electrons transfer to Pt in order to join the photocatalytic reduction process for hydrogen *** a result,the transportation and separation of photoinduced carriers were accelerated to greatest extent in the Pt/Co(II)/PCN photocatalyst.

关键词： photocatalytic h2 production hole cocatalyst Electron cocatalyst P-doped g-C3N4

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