电流(流体)
电流密度
生产(经济)
乙醇燃料
化学
乙醇
机制(生物学)
材料科学
热力学
物理
有机化学
量子力学
经济
宏观经济学
作者
Yipeng Zang,Shuo Wang,Jiaqi Sang,Pengfei Wei,Xiaomin Zhang,Qi Wang,Guoxiong Wang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-06-10
卷期号:24 (24): 7261-7268
标识
DOI:10.1021/acs.nanolett.4c01239
摘要
Copper-based catalysts have been attracting increasing attention for CO2 electroreduction into value-added multicarbon chemicals. However, most Cu-based catalysts are designed for ethylene production, while ethanol production with high Faradaic efficiency at high current density still remains a great challenge. Herein, Cu clusters supported on single-atom Cu dispersed nitrogen-doped carbon (Cux/Cu–N/C) show ethanol Faradaic efficiency of ∼40% and partial current density of ∼350 mA cm–2. Quasi in situ X-ray photoelectron spectroscopy and operando X-ray absorption spectroscopy results suggest the generation of surface asymmetrical sites of Cu+ and Cu0 as well as Cu clusters by electrochemical reduction and reconstruction during the CO2 electroreduction process. Density functional theory calculations indicate that the interaction between Cu clusters and the Cu–N/C support enhances *CO adsorption, facilitates the C–C coupling step, and favors the hydrogenation rather than dehydroxylation of the critical intermediate *CHCOH toward ethanol in the bifurcation.
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