文献类型：期刊文献

英文题名：Selective electrochemical CO2 reduction over highly porous gold films

作者：Chen, Chengzhen[1];Zhang, Bo[2];Zhong, Juhua[2];Cheng, Zhenmin[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2017

卷号：5

期号：41

起止页码：21955

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20174404327255);WOS:【SCI-EXPANDED(收录号:WOS:000413734800039)】；

基金：The financial support by the Fundamental Research Funds for the Central Universities and National Natural Science Foundation of China (21503079) is gratefully acknowledged.

语种：英文

外文关键词：Carbon dioxide - Reduction - Catalyst activity - Electrodes - Mass transfer - Gold - Metallic films

摘要：Electrocatalytic reduction of CO2 to CO is usually subject to the competitive reduction of H+ to hydrogen. In this work, it was demonstrated that increasing the local pH at the electrode/electrolyte interface would greatly improve the selectivity for CO2 reduction to CO by inhibiting hydrogen evolution, resulting in a high CO faradaic efficiency of 90.5%. And this pH-induced effect can be achieved by increasing the thickness of the porous gold film through a facile synthetic technique, based on the enhancement of the mass transfer resistance within the highly porous electrode. Moreover, the thickest film, which had a large electrochemical surface area, displayed a significantly improved catalytic activity for CO2 reduction at a low overpotential of 390 mV. These results indicate that increasing the local pH by thickening the porous gold film is selective and efficient for electrochemical CO2 reduction.