期刊
NATURE CATALYSIS
卷 5, 期 4, 页码 268-276出版社
NATURE PORTFOLIO
DOI: 10.1038/s41929-022-00761-y
关键词
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资金
- European Research Council [681292]
- NCCR Catalysis [180544]
- National Centre of Competence in Research - Swiss National Science Foundation
- Foundation of Shenzhen Science, Technology and Innovation Commission [JCYJ20210324104414039]
- European Union Marie Sklodowska-Curie Individual Fellowships [891545]
- European Union [85144]
- Starting Grant of the Swiss National Science Foundation [155876]
- Marie Curie Actions (MSCA) [891545] Funding Source: Marie Curie Actions (MSCA)
This study demonstrates that efficient CO2 electroreduction can be achieved in acidic medium by suppressing hydrogen evolution using alkali cations, overcoming the limitations caused by carbonate formation. The effects of cations are applicable to various catalysts and are achieved by modifying the electric field distribution and stabilizing key intermediates.
The reaction of carbon dioxide with hydroxide to form carbonate in near-neutral or alkaline medium severely limits the energy and carbon efficiency of CO2 electroreduction. Here we show that by suppression of the otherwise predominant hydrogen evolution using alkali cations, efficient CO2 electroreduction can be conducted in acidic medium, overcoming the carbonate problem. The cation effects are general for three typical catalysts including carbon-supported tin oxide, gold and copper, leading to Faradaic efficiency as high as 90% for formic acid and CO formation. Our analysis suggests that hydrated alkali cations physisorbed on the cathode modify the distribution of electric field in the double layer, which impedes hydrogen evolution by suppression of migration of hydronium ions while at the same time promoting CO2 reduction by stabilization of key intermediates.
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