镍
二氧化碳电化学还原
无机化学
双金属片
催化作用
过渡金属
电化学
水溶液
电催化剂
一氧化碳
材料科学
薄膜
电解质
非阻塞I/O
碳酸乙烯酯
化学
电极
物理化学
有机化学
冶金
纳米技术
作者
Sonja A. Francis,Daniel A. Torelli,J. Chance Crompton,Alnald Javier,Jonathan R. Thompson,Bruce S. Brunschwig,Manuel P. Soriaga,Nathan S. Lewis
出处
期刊:Meeting abstracts
日期:2016-09-01
卷期号:MA2016-02 (49): 3600-3600
被引量:1
标识
DOI:10.1149/ma2016-02/49/3600
摘要
We present bimetallic Ni-Ga thin films as new electro-catalysts for the conversion of carbon dioxide into methane, ethylene and ethane at low overpotentials in aqueous media. Three different phases of Ni-Ga (NiGa, Ni 3 Ga and Ni 5 Ga 3 ) were prepared by drop casting, and tested for CO 2 reduction activity in aqueous carbonate electrolytes acidified to pH 6.8 with 1 atm CO 2 . CH 4 , C 2 H 4 and C 2 H 6 are detected at potentials as anodic as -0.48V vs RHE, representing some of the lowest onset potentials for C 2 -product formation reported to date. Carbon monoxide reduction over the Ni-Ga thin films also resulted in the formation of CH 4 , C 2 H 4 and C 2 H 6 with similar Faradaic efficiencies, consistent with a CO 2 reduction mechanism that involves a CO intermediate. Theoretically, hydrocarbon formation over single element transition metal surfaces is governed by scaling relations, where the binding energy of intermediates like adsorbed CO and adsorbed CHO are coupled. This coupling typically manifests experimentally in high overpotentials for CO 2 reduction on the transition metals. The low overpotentials we observe for CO 2 reduction on the bimetallic Ni-Ga are suggested to arise from the material not being governed by such scaling relations.
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