文献类型：期刊文献

英文题名：Dynamic determination of Cu+ roles for CO2 reduction on electrochemically stable Cu2O-based nanocubes

作者：Liu, Jinze[1,2];Cheng, Ling[2];Wang, Yating[1];Chen, Rongzhen[1];Xiao, Chuqian[1];Zhou, Xiaodong[2];Zhu, Yihua[1];Li, Yuhang[1];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Frontiers Sci Ctr Mat & Dynam Chem,Minist Educ, Shanghai Engn Res Ctr Hierarch Nanomat,Key Lab Ul, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：10

期号：15

起止页码：8459

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20221511955502);WOS:【SCI-EXPANDED(收录号:WOS:000769618700001)】；

基金：This work was supported by the National Natural Science Foundation of China (22178104, 21838003, 91834301, and 22008069), the Shanghai Scientific and Technological Innovation Project (18JC1410500 and 19JC1410400), the Innovation Program of Shanghai Municipal Education Commission, "the Fundamental Research Funds for the Central Universities", and the Shanghai Sailing Program (20YF1410200).

语种：英文

外文关键词：Catalysts - Copper oxides - Ethylene - Ligands - Reduction

摘要：Copper (Cu), as the most important and efficient catalyst, has been widely studied for electrochemically reducing carbon dioxide (CO2) into multi-carbon (C2+) products. However, the roles of Cu+ species in CO2 reduction are debatable due to the instabilities of all the reported Cu oxides under negative potentials. Here, for the first time, we fabricated an electrochemically stable Cu2O catalyst. In situ Raman spectroscopy determines that, with the protection of ligands, the Cu+ species are resistant to the negative potentials and remain unchanged during CO2 reduction. We find that stable Cu2O shows a high C-2 Faraday efficiency (FE) of 73%, 1.5x higher than that of common Cu2O, which reduces to metallic Cu during the CO2 reduction, suggesting that the Cu+ species promote C-C coupling. Further, we coat the ligand-stabilized Cu2O nanocubes with AgOx clusters, which achieves an increase in ethylene FE from 35% to 50% under a current density of 150 mA cm(-2).