金属间化合物
面(心理学)
乙醇
电流密度
材料科学
密度泛函理论
电流(流体)
化学
结晶学
冶金
计算化学
热力学
物理
有机化学
心理学
社会心理学
合金
人格
量子力学
五大性格特征
作者
Peng Chen,Jingjiao Ma,Gan Luo,Shuai Yan,Junbo Zhang,Yangshen Chen,Ning Chen,Zhiqiang Wang,Wei Wei,Tsun‐Kong Sham,Yao Zheng,Min Kuang,Gengfeng Zheng
标识
DOI:10.1002/anie.202316907
摘要
The efficient ethanol electrosynthesis from CO2 is challenging with low selectivity at high CO2 electrolysis rates, due to the competition with H2 and other reduction products. Copper‐based bimetallic electrocatalysts are potential candidates for the CO2‐to‐ethanol conversion, but the secondary metal has mainly been focused on active components (such as Ag, Sn) for CO2 electroreduction, which also promote selectivity of ethylene or other reduction products rather than ethanol. Limited attention has been given to alkali‐earth metals due to their inherently active chemical property. Herein, we rationally synthesized a (111) facets‐oriented nano Cu2Mg (designated as Cu2Mg(111)) intermetallic compound with high‐density ordered Cu3‐Mg sites. The in‐situ Raman spectroscopy and density function theory calculations revealed that the Cu3ẟ−‐Mgẟ+ active sites allowed to increase *CO surface coverage, decrease reaction energy for *CO–CO coupling, and stabilize the *CHCHOH intermediates, thus promoting the ethanol formation pathway. The Cu2Mg(111) catalyst showed a high FEC2H5OH of 76.2 ± 4.8% at 600 mA·cm‐2, and a peak value of |jC2H5OH| of 720 ± 34 mA·cm‐2, almost 4 times of that using conventional Cu2Mg with (311) facets, comparable to the best reported values for the CO2‐to‐ethanol electroreduction.
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