电催化剂
化学
还原(数学)
二氧化碳电化学还原
化学工程
过电位
法拉第效率
作者
Feng Hu,Sasitha C. Abeyweera,Jie Yu,Dongtang Zhang,Yu Wang,Qimin Yan,Yugang Sun
出处
期刊:Chem
[Elsevier]
日期:2020-11-05
卷期号:6 (11): 3007-3021
被引量:11
标识
DOI:10.1016/j.chempr.2020.07.026
摘要
Summary A protocol relying on the use of silver nanostructures with well-defined dimensions and morphologies (e.g., nanocubes and nanowires) has been developed to differentiate and quantitatively determine the atom-specific activities of different surface atoms toward catalyzing electrochemical CO2 reduction reaction (CO2RR). The atom-specific activity of the twin-boundary edges (TBEs) is comparable to (or slightly higher than) that of the single-crystal edges (SCEs) formed from the crossing of two {100} surfaces, and it is on the order of ∼16 attoampere/atom (aA/atom) toward electrochemical CO2RR. This value is more than two orders higher than the atom-specific activity of the {100} surface atoms, i.e., ∼0.1 aA/atom. The high catalytic activity of the TBEs, which represent a class of commonly existing surface defects in stable metal nanostructures with face-centered cubic lattices, is consistent with the DFT calculations, in which the bridge-type binding configuration of COOH∗ at the TBEs stabilizes this intermediate to promote overall CO2RR.
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