Self-template-oriented synthesis of lead-free perovskite Cs_(3)Bi_(2)I_(9) nanosheets for boosting photocatalysis of CO_(2) reduction over Z-scheme heterojunction Cs_(3)Bi_(2)I_(9)/CeO_(2)  

作　　者：You-Xiang Feng Guang-Xing Dong Ke Su Zhao-Lei Liu Wen Zhang Min Zhang Tong-Bu Lu 

机构地区：[1]MOE International Joint Laboratory of Materials Microstructure,Institute for New Energy Materials and Low Carbon Technologies,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China [2]Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion,School of Chemistry and Chemical Engineering,Tianjin University of Technology,Tianjin 300384,China

出　　处：《Journal of Energy Chemistry》2022年第6期348-355,I0010,共9页能源化学（英文版）

基　　金：financially supported by the Natural Science Foundation of Tianjin City (17JCJQJC43800, 19JCQNJC05500);the National Key R&D Program of China (2017YFA0700104);NSFC (21931007);the 111 Project of China (D17003)。

摘　　要：Lead halide perovskite (LHP) nanocrystals have been intensely studied as photocatalysts for artificial photosynthesis in recent years.However,the toxicity of lead in LHP seriously limits their potential for widespread applications.Herein,we first present the synthesis of 2D lead-free halide perovskite (Cs_(3)Bi_(2)I_(9)) nanosheets with self-template-oriented method,in which BiOI/Bi_(2)O_(2) nanosheets were used as the template and Bi ion source simultaneously.Through facile electrostatic self-assembly strategy,a Z-scheme heterojunction composed of Cs_(3)Bi_(2)I_(9)nanosheets and CeO_(2) nanosheets (Cs_(3)Bi_(2)I_(9)/CeO_(2)-3:1) was constructed as photocatalyst for the photo-reduction of CO_(2) coupled with the oxidation of H_(2)O.Due to the matching energy levels and the close interfacial contact between Cs_(3)Bi_(2)I_(9)and CeO_(2) nanosheets,the separation efficiency of the photogenerated carriers in Cs_(3)Bi_(2)I_(9)/CeO_(2)-3:1 composite was significantly improved.Consequently,the environment-friendly halide perovskite heterojunction Cs_(3)Bi_(2)I_(9)/CeO_(2)-3:1presents impressive photocatalytic activity for the reduction of CO_(2)to CH_(4)and CO with an electron consumption yield of 877.04μmol g^(-1),which is over 7 and 15 times higher than those of pristine Cs_(3)Bi_(2)I_(9)and CeO_(2)nanosheets,exceeding the yield of other reported bismuth-based perovskite for photocatalytic CO_(2)reduction.

关 键 词：Lead-free perovskite Z-scheme heterojunction Cs_(3)Bi_(2)I_(9)nanosheets Photocatalytic CO_(2)reduction H_(2)O oxidation 

分 类 号：TQ426[化学工程] TB383.1[一般工业技术—材料科学与工程] X701[环境科学与工程—环境工程]