期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 18, 页码 16546-16555出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b01553
关键词
electrochemical carbon dioxide reduction; bimetallic catalyst; Au-Cu alloy; thin film; electronic effect; d-band center
资金
- China Scholarship Council (CSC) [201507565007]
- Netherlands Organization for Scientific Research (NWO)
Au-Cu bimetallic thin films with controlled composition were fabricated by magnetron sputtering co-deposition, and their performance for the electrocatalytic reduction of CO2 was investigated. The uniform planar morphology served as a platform to evaluate the electronic effect isolated from morphological effects while minimizing geometric contributions. The catalytic selectivity and activity of Au-Cu alloys was found to be correlated with the variation of electronic structure that was varied with tunable composition. Notably, the d-band center gradually shifted away from the Fermi level with increasing Au atomic ratio, leading to a weakened binding energy of *CO, which is consistent with low CO coverage observed in CO stripping experiments. The decrease in the *CO binding strength results in the enhanced catalytic activity for CO formation with the increase in Au content. In addition, it was observed that copper oxide/hydroxide species are less stable on Au-Cu surfaces compared to those on the pure Cu surface, where the surface oxophilicity could be critical to tuning the binding strength of *OCHO. These results imply that the altered electronic structure could explain the decreased formation of HCOO- on the Au-Cu alloys. In general, the formation of CO and HCOO- as main CO2 reduction products on planar Au-Cu alloys followed the shift of the d-band center, which indicates that the electronic effect is the major governing factor for the electrocatalytic activity of CO2 reduction on Au-Cu bimetallic thin films.
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