Rich oxygen vacancies mediated bismuth oxysulfide crystals towards photocatalytic CO-to-CH conversion  

富氧空位修饰的铋氧硫晶体用于光催化二氧化碳还原转化为甲烷

作　　者：Lisha Jiang Yuan Li Xiaoyong Wu Gaoke Zhang 姜丽莎;李源;吴晓勇;张高科(State Key Laboratory of Silicate Materials for Architectures,Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan University of Technology,Wuhan 430070,China;Shenzhen Research Institute of Wuhan University of Technology,Shenzhen 518000,China;Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450052,China)

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan University of Technology,Wuhan 430070,China [2]Shenzhen Research Institute of Wuhan University of Technology,Shenzhen 518000,China3 [3]Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450052,China

出　　处：《Science China Materials》2021年第9期2230-2241,共12页中国科学（材料科学（英文版）

基　　金：supported by the Science and Technology Planning Project of Shenzhen Municipality(JCYJ20200109150225155);the Natural Science Foundation of Hubei Province (2016CFA078);the National Natural Science Foundation of China (51472194 and 21975193);the Fundamental Research Funds for the Central Universities (2020-YB-031)

摘　　要：Oxygen vacancy-rich bismuth oxysulfide(Bi_(2)O_(2)S)with layered structure was prepared for efficient photocatalytic CO_(2) reduction under visible light irradiation.The existence of rich oxygen vacancies in Bi_(2)O_(2)S,which was proven by sufficient characterization,can provide abundant active sites,improve CO_(2) adsorption and activation abilities and boost the separation efficiency of photogenerated carriers,as determined by theoretical and experimental analyses.As a result,Bi_(2)O_(2)S with rich oxygen vacancies achieves excellent CO_(2) conversion with a CH4 production of 65.8μmol g^(-1) under 90 min of visible light irradiation,which was 27-fold higher than the pristine Bi_(2)O_(2)S.The mechanism of photocatalytic conversion of CO_(2) to CH4 was also determined by in situ FT-IR analyses.This study provides an in-depth understanding of the development of Bi-O-S system photocatalysts through defect engineering for photocatalytic CO_(2) reduction.制备高效光催化剂将二氧化碳还原转化为有价值的化学品,是缓解能源危机和环境污染的有效措施.本论文通过高温焙烧法,制备了富氧空位修饰的Bi_(2)O_(2)S光催化剂,并将其用于可见光驱动的CO_(2)光还原,确定了富氧空位修饰的Bi_(2)O_(2)S光催化剂的最佳制备条件.通过一系列实验及表征,证实了BiOS-OV中丰富氧空位的存在;结合理论计算深入分析了引入的丰富氧空位对Bi_(2)O_(2)S光催化剂的内部电子结构及光化学性能等的影响.深入研究了整个体系中光催化CO_(2)还原反应的具体步骤,旨在揭示丰富氧空位的存在引起CO_(2)光还原性能提高的根本原因.

关 键 词：oxygen vacancies bismuth oxysulfide charge separation PHOTOCATALYSIS CO_(2)reduction 

分 类 号：TQ221.11[化学工程—有机化工] O643.36[理学—物理化学] O644.1[理学—化学]