期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 47, 页码 16473-16476出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja508879j
关键词
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资金
- Office of Basic Energy Sciences, U.S. Department of Energy (DOE-BES) [DE-FG02-08ER15995]
- DOE-BES, Division of Chemical Sciences
- Cluster of Excellence RESOLV - Deutsche Forschungsgemeinschaft (DFG) [EXC 1069]
- DFG [STR 596/3-1]
- U.S. Department of Energy (DOE) [DE-FG02-08ER15995] Funding Source: U.S. Department of Energy (DOE)
The electrocatalytic reduction of CO2 to industrial chemicals and fuels is a promising pathway to sustainable electrical energy storage and to an artificial carbon cycle, but it is currently hindered by the low energy efficiency and low activity displayed by traditional electrode materials. We report here the size-dependent catalytic activity of micelle-synthesized Au nanoparticles (NPs) in the size range of similar to 1-8 nm for the electroreduction of CO2 to CO in 0.1 M KHCO3. A drastic increase in current density was observed with decreasing NP size, along with a decrease in Faradaic selectivity toward CO. Density functional theory calculations showed that these trends are related to the increase in the number of low-coordinated sites on small NPs, which favor the evolution of H2 over CO2 reduction to CO. We show here that the H2/CO product ratio can be specifically tailored for different industrial processes by tuning the size of the catalyst particles.
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