期刊
ELECTROCHIMICA ACTA
卷 306, 期 -, 页码 245-253出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.102
关键词
Ag foam; Carbon monoxide formation; CO2 conversion; Ionic liquid; Nanoneedles
资金
- CTI Swiss Competence Centre for Energy Research (SCCER Heat and Electricity Storage)
- Russian Foundation for Basic Research [17-03-00602]
- Ministry of Science and Higher Education, Russian Federation of the Russian Federation
- Swiss National Science Foundation (SNSF) [200020_172507]
- interfaculty Microscopy Imaging Centre (MIC) of the University of Bern
We employ a novel type of nanostructured silver foam electrocatalyst to the electrochemical CO2 reduction reaction (CO2RR) in 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) ionic liquid. The Ag catalyst is prepared from an aqueous electroplating bath by means of an additive-assisted electrodeposition approach, yielding macro-porous Ag foams. The pore sidewalls are composed of Ag nanoneedles having diameters of similar to 50-100 nm and lengths that can exceed 1 mm. We demonstrate that, when combined with the [Bmim][BF4] electrolyte, this Ag electrocatalyst significantly shifts the onset of CO2 electroreduction by similar to 220 mV to less negative potentials as compared to a polished Ag foil electrode. The addition of moderate amounts of water (optimum water mole fraction of 20%) to the pure [Bmim] [BF4] electrolyte leads to a further similar to 120 mV decrease in the CO2RR overpotential. The combination of the Ag foam catalyst with the [Bmim][BF4]/water mixture results in a similar to 300mV wide potential window where CO is selectively produced with Faraday efficiencies > 94%. The structural stability of the catalyst is supported by identical location scanning electron microscopy. (c) 2019 Elsevier Ltd. All rights reserved.
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