文献类型：期刊文献

英文题名：Roles of ion pairing on electroreduction of carbon dioxide based on imidazolium-based salts

作者：Niu, Dongfang[1];Wang, Haiyang[1];Li, Huicheng[1];Wu, Zhijuan[1];Zhang, Xinsheng[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：158

起止页码：138

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20150600504737);WOS:【SCI-EXPANDED(收录号:WOS:000350446000019)】；

基金：The present work was financially supported by the National Natural Science Foundation of China (NO. 21303053), the Fundamental Research Funds for the Central Universities and the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-14C02).

语种：英文

外文关键词：CO2 electroreduction; Ion-pairing effect; Imidazolium-based salts; Catalysis

摘要：The roles of ion pairing on CO2 electroreduction involving imidazolium-based salts are explored on an Ag electrode in a DMF solution. The electroreductive behaviours of CO2 and the IR results establish the dominant role of the cation of imidazolium-based salts in CO2 electrocatalytic reduction process. Density functional theory (DFT) calculations predict that the ion pair formation is mainly driven by the attraction of the four nearby and positively charged hydrogen atoms which are at the C2, N1 and N3-positions of an imidazolium cation for the negatively charged oxygen atoms in the CO2. species. The electrostatic interaction between an imidazolium cation and the CO2. species decreases with increasing the size of the alkyl substituent at the N1-position of that imidazolium cation. (C) 2015 Elsevier Ltd. All rights reserved.