Highly active electrocatalytic CO_(2) reduction with manganese N-heterocyclic carbene pincer by para electronic tuning  

作　　者：Can Huang Jiahao Liu Hai-Hua Huang Xianfang Xu Zhuofeng Ke 

机构地区：[1]School of Materials Science&Engineering,School of Chemistry,PCFM Lab,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Chinese Chemical Letters》2022年第1期262-265,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21973113);the Guangdong Natural Science Funds for Distinguished Young Scholar(No.2015A030306027);the Fundamental Research Funds for the Central Universities。

摘　　要：Electronic tuning by para substitutions was explored to achieve a highly active manganese N-heterocyclic carbene pincer complex for the selective electrocatalytic reduction of CO_(2)to CO.[MnCNC^(OMe)]BF_(4)(L2-Mn)bearing an electron-donating group(-OMe)showed high activity with 63×catalytic current enhancement,average Faradaic efficiency of 104%,and a TOF_(max) value of 26,127 s^(-1),which is 127 times higher than that of unsubstituted[MnCNCH]Br(L1-Mn)reported previously.In contrast,the electron-withdrawing group(-COOMe)in[MnCNC^(CO^(OMe))]PF_(6)(L3-Mn)inhibited the electrocatalytic activity.Ambient Brønstic acid,however,suppressed the activity of L2-Mn probably due to the protonation of the-OMe group.These findings indicate a potential electronic tuning strategy to improved manganese N-heterocyclic carbene catalysts for CO_(2)reduction.

关 键 词：Pyridine N-heterocyclic carbene ELECTROCATALYSIS Carbon dioxide conversion MANGANESE Substituent effect 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学]