Embedding laser-generated CdTe nanocrystals into ultrathin ZnIn_(2)S_(4) nanosheets with sulfur vacancies for boosted photocatalytic H_(2) evolution  

作　　者：Z.G.Tai G.T.Sun X.H.Zhang X.B.Yang T.Wang Z.Y.Fang Q.Ye L.C.Jia H.Q.Wang 

机构地区：[1]State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]Research&Development Institute of Northwestern Polytechnical University in Shenzhen,Shenzhen 518063,China [3]School of Materials Science and Engineering,Shaanxi Normal University,Xi’an 710119,China

出　　处：《Journal of Materials Science & Technology》2023年第35期113-122,共10页材料科学技术（英文版）

基　　金：The research was sponsored by the National Natural Science Foundation of China(Nos.52172101 and 51872240);the National Key R&D Program for International Cooperation(No.2021YFE0115100);Shaanxi Province Key Research and Develop-ment Program(No.2021ZDLGY14-08);the Fundamental Research Funds for the Central Universities(No.3102019JC005);the Guangdong Basic and Applied Basic Research Foundation(No.2022A1515110228).The authors thank the Analysis and Test Center of Northwestern Polytechnical University and Shaanxi Materials Analysis and Research Center for XPS,SEM,and TEM characterizations.

摘　　要：To suppress the inner charge recombination and inject vast electrons,CdTe nanocrystals are embedded into ultrathin ZnIn_(2)S_(4) nanosheets to construct ZnIn_(2)S_(4)/CdTe heterostructures,where the nanocrystals are generated by a laser irradiation method.The optimal ZnIn_(2)S_(4)/CdTe heterojunction exhibits an excellent catalytic activity of 24.3 mmol/h/g,which is relatively high among the ZnIn_(2)S_(4)-based photocatalysts with-out noble metals.This enhancement is ascribed to a win-win mechanism of nanoscale heterojunctions and sulfur vacancies.The strong electron coupling effect,which is verified by density functional the-ory(DFT)calculations,impels the photo-generated electrons transfer from CdTe to ZnIn_(2)S_(4),boosting the charge separation.Meanwhile,the sulfur vacancies existing in ZnIn_(2)S_(4) can capture photoelectrons and act as active sites,facilitating the H_(2) generation reaction.In addition,the ZnIn_(2)S_(4) base and the ZnIn_(2)S_(4)/CdTe heterojunction also possess an evident photothermal effect and renewable cycle phenomena,enhancing the photocatalytic performance.This research provides new insights into the regulation of charge transfer through embedding nanocrystals.

关 键 词：Photocatalysis Hydrogen evolution Laser irradiation HETEROSTRUCTURE Sulfur vacancies 

分 类 号：TQ426[化学工程] TQ116.2[一般工业技术—材料科学与工程] TB383.1