Acetate-assistant efficient cation-exchange of halide perovskite nanocrystals to boost the photocatalytic CO_(2) reduction  

作　　者：Jialin Cheng Yanfei Mu Liyuan Wu Zhaolei Liu Ke Su Guangxing Dong Min Zhang Tongbu 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：《Nano Research》2022年第3期1845-1852,共8页纳米研究（英文版）

基　　金：Natural Science Foundation of Tianjin City(No.17JCJQJC43800);the National Key R&D Program of China(No.2017YFA0700104);the National Natural Science Foundation of China(No.21931007);the 111 Project(No.D17003).

摘　　要：The judicious implantation of active metal cations into the surface of semiconductor nanocrystal(NC)through cation-exchange is one of the facile and viable strategies to enhance the activity of catalysts for photocatalytic CO_(2)reduction,by shortening the transfer pathway of photogenerated carriers and increasing the active sites simultaneously.However,cation-exchange is hard to achieve for halide perovskite NCs owing to the stable octahedron of[PbX6]4−with strong interaction between halogen and lead.Herein,we report a facile method to overcome this obstacle by replacing partial Br−with acetate(Ac−)to generate CsPbBr_(3) NC(coded as CsPbBr_(3−x)Ac_(x)).A small amount of Ac−instead of Br−does not change the crystal structure of halide perovskite.Owing to the weaker interaction between acetate and lead in comparison with bromide,the corresponding octahedron structure containing acetate in CsPbBr_(3−x)Ac_(x) can be easily opened to realize efficient cation-exchange with Ni^(2+) ions.The resulting high loading amount of Ni^(2+) as active site endows CsPbBr_(3−x)Ac_(x) with an improved performance for photocatalytic CO_(2)reduction under visible light irradiation,exhibiting a significantly increased CO yield of 44.09μmol·g^(−1)·h^(−1),which is over 8 and 3 times higher than those of traditional pristine CsPbBr_(3) and nickel doped CsPbBr_(3) NC,respectively.This work provides a critical solution for the efficient metal doping of low-cost halide perovskite NCs to enhance their photocatalytic activity,promoting their practical applications in the field of photocatalysis.

关 键 词：CO_(2)reduction halide perovskite nanocrystal CATION-EXCHANGE photocatalysis surface doping 

分 类 号：O62[理学—有机化学]