Cr dopants and S vacancies in ZnS to trigger efficient photocatalytic H_(2) evolution and CO_(2) reduction  

作　　者：Linping Bao Yushuai Jia Xiaohui Ren Xin Liu Chunhui Dai Sajjad Ali Mohamed Bououdina Zhanghui Lu Chao Zeng 

机构地区：[1]The Institute of Advanced Materials,Jiangxi Normal University,Nanchang 330022,China [2]The State Key Laboratory of Refractories and Metallurgy,School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China [3]Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation,East China University of Technology,Nanchang 330013,China [4]Energy,Water,and Environment Lab,College of Humanities and Sciences,Prince Sultan University,Riyadh 11586,Saudi Arabia

出　　处：《Journal of Materials Science & Technology》2024年第32期75-85,共11页材料科学技术(英文版)

基　　金：supported by the National Natural Sci-ence Foundation of China(No.52002158);the Natural Science Foundation of Jiangxi Province(Nos.20204BCJL23039,20192ACBL21027);The authors would like to thank Prince Sultan University for computational support and Wenjuan Li from Shiyan-jia Lab(www.shiyanjia.com)for the XPS analysis.

摘　　要：Driven by endless solar energy,photocatalytic H2 evolution from water splitting and CO_(2) conversion to hydrocarbon fuels over semiconductor photocatalysts are of great potential to simultaneously settle the greenhouse effect and energy shortage.Herein,Cr-doped zinc sulfide(ZnS)with accompanying sulphur vacancies(Vs)photocatalytic materials is developed by a facile hydrothermal method.The Cr dopants centralize photoinduced holes and Vs trap electrons,forming a synergistic effect for accelerating charge separation and transfer.The reaction energy barrier for both H2 evolution and CO_(2) reduction has been optimized.Therefore,in the absence of a cocatalyst,the optimal catalyst(Zn_(0.94) Cr_(0.06) S)achieves an out-standing H_(2) evolution activity of 20.3 mmol g^(-1) h^(-1),which is approximately 2.9 times higher than 6.9 mmol g^(-1) h^(-1) for pristine ZnS.In addition,in the gas-solid reaction system without co-catalysts or sacrificial agents,the Zn_(0.94) Cr_(0.06) S exhibits a considerable CO evolution rate of 19.56μmol g^(-1) h^(-1),about 10.1 times higher than ZnS(1.94μmol g^(-1) h^(-1)).Both the performances for H_(2) evolution and CO_(2) reduction of Zn_(0.94) Cr_(0.06) S outperform most of the previously reported photocatalysts.Particularly,the Zn_(0.94) Cr_(0.06) S possesses superior stability,the photoactivity of which exhibits no noticeable deactiva-tion after six cycles’reactions.This work may shed light on the rational design and fabrication of highly efficient materials via combining individual element doping and defect engineering.

关 键 词：Photocatalysis H_(2)evolution CO_(2)reduction Cr doping Sulphur vacancy 

分 类 号：O64[理学—物理化学]