DOI: 10.1016/j.jcou.2017.05.024
Scopus记录号: 2-s2.0-85021100910
论文题名: Selective conversion of CO2 to formate on a size tunable nano-Bi electrocatalyst
作者: Qiu Y. ; Du J. ; Dong W. ; Dai C. ; Tao C.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 20 起始页码: 328
结束页码: 335
语种: 英语
英文关键词: Carbon dioxide
; Di-halogen bismuth oxyhalide
; Formate
; High faradaic efficiency
; Nano-Bi
Scopus关键词: Bismuth
; Carbon
; Catalyst activity
; Catalysts
; Efficiency
; Electrocatalysts
; Electrodes
; Electrolytic reduction
; Particle size
; Di-halogen bismuth oxyhalide
; Electrocatalytic reduction
; Electrochemical active surface areas
; Electrochemical conversion
; Electron transferring
; Faradaic efficiencies
; Formate
; Nano-Bi
; Carbon dioxide
英文摘要: The size tunable nano-Bi catalyst was fabricated via electroreduction of di-halogen bismuth oxyhalide (BiOX0.5Y0.5, X, Y=Cl, Br, I) and applied in CO2 electrochemical conversion to fomate. The nano-Bi particle size was controlled by changing with the halogen species used in precursors. A significant size effect on electrochemical active surface area (SE) and current density, as well as faradaic efficiency for formate was observed. The nano-Bi derived from precursor BiOCl0.5Br0.5 possessed minimum particle size of 10 nm and exhibited electrochemical active surface area (SE) of 4.63 cm2 mg-1. With the optimal precursor loading amount of 0.75 mg cm-2, the maximum Faradaic efficiency found for formate was 98.4% at -1.6 V (vs. SCE) with the desirable stability of 14 h, that is 92.7% and 86.2% corresponding to the nano-Bi electrode derived from BiOI0.5Br0.5 and BiOCl0.5I0.5, respectively. Characterization analysis revealed that the prepared catalyst film was composed of Bi3+ and Bi0, and the ratio of Bi0 to Bi3+ was closely related to the halogen species in precursors. The dominant exposed (012) plane of nano-Bi over electrode revealed the intrinsic property of the size controllable catalytic activity. The Tafel analysis suggested that the formation of surface-absorbed species via one electron transferring mechanism would be the initial rate determining step over the nano-Bi electrocatalyst for CO2 electrocatalytic reduction. © 2017 Published by Elsevier Ltd. 资助项目: National Natural Science Foundation of China
; National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52710
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Qiu Y.,Du J.,Dong W.,et al. Selective conversion of CO2 to formate on a size tunable nano-Bi electrocatalyst[J]. Journal of CO2 Utilization,2017-01-01,20