期刊
APPLIED SURFACE SCIENCE
卷 541, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148577
关键词
CO2 electroreduction; Formate; Bi; Electrodeposition
类别
资金
- National Natural Science Foundation of China [41867021]
- Natural Science Foundation of the Jiangxi Province [20202BAB213012, 20171BAB206048]
- Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution [AE2002]
This study developed a facile strategy to obtain Bi catalysts with a hexagonal sheet structure on copper foil, showing high efficiency for formate production and stability in CO2 reduction. The sharp edges and corner sites of the catalyst provided numerous surface-active sites, increasing electrical conductivity and local electric field intensities of the surface electrode.
The electrochemical conversion of CO2 to formate still suffers from poor selectivity, low production rate, and high overpotential. In this study, a facile strategy is developed to obtain Bi catalysts with a hexagonal sheet structure on copper foil via the constant potential electrodeposition method. The electrocatalyst shows high activity for formate production from CO2 reduction, with the formate faradaic efficiency (FE) reaching nearly 100% at an overpotential of 0.65 V; a high production rate of 96.37 mu mol. h(-1) mm(-2) is obtained, and the corresponding power consumption is as low as 3.64 kW.h.kg(-1). The excellent catalytic ability is derived from the sharp edges and corner sites of the catalyst, as they provide numerous surface-active sites and increase the electrical conductivity and local electric field intensities of the surface electrode; thus, the electrochemically active surface area (ECSA) and the electron-donating ability of the Bi electrode are enhanced, while the competing hydrogen evolution reaction (HER) is significantly inhibited. Moreover, the Bi sheets show excellent stability in 24 h electrolysis, with a formate FE of >= 95.8% in aqueous 0.1 M KHCO3 solution. This work indicates that structural adjustment is a critical factor in enhancing the electrocatalytic performance of metallic Bi.
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