一氧化碳
化学
甲烷
碳氢化合物
乙烯
电合成
无机化学
氢
吸附
电化学
铜
溶解度
合成气
催化作用
光化学
有机化学
物理化学
电极
作者
Marcel Schreier,Youngmin Yoon,Megan N. Jackson,Yogesh Surendranath
标识
DOI:10.1002/ange.201806051
摘要
The dynamics of carbon monoxide on Cu surfaces was investigated during CO reduction, providing insight into the mechanism leading to the formation of hydrogen, methane, and ethylene, the three key products in the electrochemical reduction of CO2. Reaction order experiments were conducted at low temperature in an ethanol medium affording high solubility and surface-affinity for carbon monoxide. Surprisingly, the methane production rate is suppressed by increasing the pressure of CO, whereas ethylene production remains largely unaffected. The data show that CH4 and H2 production are linked through a common H intermediate and that methane is formed through reactions among adsorbed H and CO, which are in direct competition with each other for surface sites. The data exclude the participation of solution species in rate-limiting steps, highlighting the importance of increasing surface recombination rates for efficient fuel synthesis.
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