CO_(2)-assisted formation of grain boundaries for efficient CO–CO coupling on a derived Cu catalyst  

作　　者：Zhuang-Zhuang Niu Li-Ping Chi Zhi-Zheng Wu Peng-Peng Yang Ming-Hui Fan Min-Rui Gao 

机构地区：[1]Division of Nanomaterials&Chemistry,Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China

出　　处：《National Science Open》2023年第2期93-105,共13页国家科学进展（英文）

基　　金：supported by the National Basic Research Program of China(2018YFA0702001);the National Natural Science Foundation of China(21975237 and 51702312);Anhui Provincial Research and Development Program(202004a05020073);the USTC Research Funds of the Double First-Class Initiative(YD2340002007);the Fundamental Research Funds for the Central Universities(WK2340000101);the Technical Talent Promotion Plan(TS2021002);the Recruitment Program of Global Youth Experts.

摘　　要：The electrochemical CO_(2)reduction reaction(CO_(2)RR)on Cu catalyst holds great promise for converting CO_(2)into valuable multicarbon(C_(2+))compounds,but still suffers poor selectivity due to the sluggish kinetics of forming carbon–carbon(C–C)bonds.Here we reported a perovskite oxide-derived Cu catalyst with abundant grain boundaries for efficient C–C coupling.These grain boundaries are readily created from the structural reconstruction induced by CO_(2)-assisted La leaching.Using this defective catalyst,we achieved a maximum C_(2+)Faradaic efficiency of 80.3%with partial current density over 400 mA cm−2 in neutral electrolyte in a flow-cell electrolyzer.By combining the structural and spectroscopic investigations,we uncovered that the in-situ generated defective sites trapped by grain boundaries enable favorable CO adsorption and thus promote C–C coupling kinetics for C_(2+)products formation.This work showcases the great potential of perovskite materials for efficient production of valuable multicarbon compounds via CO_(2)RR electrochemistry.

关 键 词：ELECTROCHEMICAL CO_(2) reduction multicarbon products PEROVSKITE OXIDE structural evolution DEFECTIVE SITES 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]