化学
甲烷
催化作用
乙烯
无机化学
铜
法拉第效率
电解
选择性
电化学
有机化学
物理化学
电极
电解质
作者
Teng Zhang,Sumit Verma,Soo-Jeong Kim,Tim T. Fister,Paul J. A. Kenis,Andrew A. Gewirth
标识
DOI:10.1016/j.jelechem.2020.113862
摘要
Pyrolyzing Cu(II) precursors absorbed on carbon black gave an eletrocatalytic material for the electroreduction of CO2. Controlled potential electrolysis and GC analysis revealed an unexpected selectivity towards methane even in alkaline media, with a methane Faradaic efficiency as high as 42%, a partial current density of 100 mA/cm2 (at −1 V vs. RHE) and a methane/ethylene ratio of 4:1. XPS, EXAFS, and EDX mapping results indicate a single-site Cu(I) center as the catalytically active site. The limited size of the active sites is believed to be crucial for the preferential formation of methane over ethylene.
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