Ligand-free CsPbBr_(3) with calliandra-like nanostructure for efficient artificial photosynthesis  

作　　者：Yan-Fei Mu Hui-Ling Liu Meng-Ran Zhang Hong-Juan Wang 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]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225009,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2023年第2期317-325,I0009,共10页能源化学（英文版）

基　　金：financially supported by the Natural Science Foundation of Tianjin City(17JCJQJC43800);the National Key R&D Program of China(2017YFA0700104);the National Science Foundation of China(21931007,U21A20286);Jiangsu Funding Program for Excellent Postdoctoral Talent and the 111 Project of China(D17003)。

摘　　要：The low-efficiency CO_(2) uptake capacity and insufficient photogenerated exciton dissociation of current metal halide perovskite(MHP)nanocrystals with end-capping ligands extremely restrict their application in the field of artificial photosynthesis.Herein,we demonstrate that ligand-free CsPbBr_(3) with calliandralike nanostructure(LF-CPB CL)can be synthesized easily through a ligand-free seed-assisted dissolutionrecrystallization growth process,exhibiting significantly enhanced CO_(2) uptake capacity.More specifically,the abundant surface bromine(Br)vacancies in ligand-free MHP materials are demonstrated to be beneficial to photogenerated carrier separation.The electron consumption rate of LF-CPB CL for photocatalytic CO_(2) reduction increases 7 and 20 times over those of traditional ligand-capping CsPbBr_(3)nanocrystal(L-CPB NC)and bulk CsPbBr_(3),respectively.Moreover,the absence of ligand hindrance can facilitate the interfacial electronic coupling between LF-CPB CL and tetra(4-carboxyphenyl)porphyrin iron(Ⅲ)chloride(Fe-TCPP)cocatalyst,bringing forth significantly accelerated interfacial charge separation.The LF-CPB CL/Fe-TCPP exhibits a total electron consumption rate of 145.6μmol g^(-1) h^(-1) for CO_(2)photoreduction coupled with water oxidation which is over 14 times higher than that of L-CPB NC/FeTCPP.

关 键 词：Artificial photosynthesis Charge separation Halide perovskite LIGAND-FREE Vacancy defect 

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