文献类型：期刊文献

英文题名：Nano-scale gas channels in Ag electrocatalysts promoting the efficient CO2-to-CO conversion over a wide potential window

作者：Liu, Ya[1];Li, Yicheng[1];Hou, Guoyu[1];Li, Xingqiu[1];Zheng, Zhen[1];Zhou, Yujie[1];Liu, Bo[1];Yang, Qiang[1];Zhang, Yu[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：68

期号：11

起止页码：5632

外文期刊名：SCIENCE CHINA-CHEMISTRY

收录：;EI(收录号：20252318546757);WOS:【SCI-EXPANDED(收录号:WOS:001501652300001)】；

基金：This work was supported by the National Natural Science Foundation of China (22479048, 22109044, 22178099), the Natural Science Foundation of Shanghai, China (22ZR1418500), the Start-up Funds from the East China University of Science and Technology and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：CO2 reduction; Ag nanofoams; gas channels; gas diffusion electrodes; catalysts

摘要：Electrochemical CO2 reduction reaction (CO2RR) is a promising technique to address the excess CO2 emissions for closing the global carbon cycle. However, challenges remain to break the trade-off between high Faradaic efficiencies and high current densities. Herein, we synthesize Ag nano-foams (Ag NFs) featuring sufficient gas channels by a facile wet-chemical method. It is revealed that the gaseous products can be rapidly released from Ag NFs with the presence of nanochannels, profiting from the exposure of active sites and their further access to CO2. COMSOL simulation verifies the uniform distribution of low-pressure drop and thus promotes local mass transfer within the catalyst layers. Benefiting from the improved transport features, the Ag NFs achieve excellent CO Faradaic efficiencies (FECO > 90.9%) in a wide potential window (-0.5V(RHE)--1.2V(RHE)), together with a high partial current density of 365.7 mA cm(-2) at -1.2V(RHE). This study provides insights into the rational regulation of gas and electrons within electrocatalysts for efficient CO2-to-gas conversion.