期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 13, 页码 5261-5266出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b12766
关键词
-
资金
- Cluster of Excellence RESOLV at RUB - Deutsche Forschungsgemeinschaft [EXC 1069]
- German Federal Ministry of Education and Research (Bundesministerium fur Bildung and Forschung BMBF) [03SF0523C]
- European Research Council [ERC-725915]
CO2 electroreduction into useful chemicals and fuels is a promising technology that might be used to minimize the impact that the increasing industrial CO2 emissions are having on the environment. Although plasma-oxidized silver surfaces were found to display a considerably decreased overpotential for the production of CO2 the hydrogen evolution reaction (HER), a competing reaction against CO2 reduction, was found to increase over time. More stable and C1-product-selective SnOx/AgOx catalysts were obtained by electrodepositing Sn on O-2-plasma-pretreated Ag surfaces. In particular, a strong suppression of HER (below 5% Faradaic efficiency (FE) at -0.8 V vs the reversible hydrogen electrode, RHE) during 20 h was observed. Ex situ scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS), quasi in situ X-ray photoelectron spectroscopy (XPS), and operando X-ray absorption near-edge structure spectroscopy (XANES) measurements showed that our synthesis led to a highly roughened surface containing stable Sn delta+/Sn species that were found to be key in the enhanced activity and stable CO/formate (HCOO-) selectivity. Our study highlights the importance of roughness, composition, and chemical state effects in CO2 electrocatalysis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据