文献类型：期刊文献

英文题名：Sharp Cu@Sn nanocones on Cu foam for highly selective and efficient electrochemical reduction of CO2 to formate

作者：Chen, Chengzhen[1];Pang, Yuanjie[2];Zhang, Fanghua[1];Zhong, Juhua[3];Zhang, Bo[4];Cheng, Zhenmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China;[3]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[4]Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200438, Peoples R China

年份：2018

卷号：6

期号：40

起止页码：19621

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20184305977899);WOS:【SCI-EXPANDED(收录号:WOS:000448413100034)】；

基金：The financial support by National Nature Science Foundation (21676085, 21503079) is gratefully acknowledged.

语种：英文

外文关键词：Mass transfer - Tin compounds - Tin - Catalyst selectivity - Catalyst activity - Nanostructures - Positive ions - Electrolytic reduction

摘要：Electrochemical reduction of aqueous CO2 into formate is subject to poor selectivity and low current density with conventional Sn-based catalysts owing to the inert nature of CO2 molecules and the low number of active sites. Recently, it has been demonstrated that alkali metal cations could greatly enhance selectivity for CO2 reduction by stabilizing the key intermediates, which leads to an effective solution to this problem by concentrating local metal cations through tailoring the catalyst structure. Herein, we synthesized spiky Cu@Sn nanocones over a macroporous Cu foam, which has a curvature radius of 10nm, via facile electrochemical coating of a thin layer of Sn over the Cu nanoconic surface. A faradaic efficiency of 90.4% toward formate production was achieved, with a current density of 57.7 mA cm(-2) at -1.1 V vs. a reversible hydrogen electrode, which far exceeds results achieved to date with state-of-the-art Sn catalysts. The performance should be attributed to the combined effects of a sharp conical feature that facilitates the enrichment of surface-adsorbed metal cations and the promotion of the mass transfer and active sites growth favored by the three-dimensional porous network.