DOI: 10.1016/j.jcou.2016.04.013
Scopus记录号: 2-s2.0-84969522934
论文题名: Enhanced CO selectivity and stability for electrocatalytic reduction of CO2 on electrodeposited nanostructured porous Ag electrode
作者: Wang H. ; Han Z. ; Zhang L. ; Cui C. ; Zhu X. ; Liu X. ; Han J. ; Ge Q.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2016
卷: 15 语种: 英语
英文关键词: CO faradaic efficiency
; Electrochemical CO2 reduction
; Nanostructured surface
; Porous Ag foams
; Stability
Scopus关键词: Carbon dioxide
; Convergence of numerical methods
; Efficiency
; Electrocatalysts
; Electrodeposition
; Electrodes
; Nanostructured materials
; Pore size
; Reaction intermediates
; Reduction
; Competitive reactions
; Electrocatalytic reduction
; Electrochemical surface area
; Faradaic efficiencies
; High current densities
; Hydrogen evolution reactions
; Nanostructured electrocatalysts
; Nanostructured surface
; Silver
英文摘要: Graphical abstract: Nanostructured electrocatalysts for CO2 reduction have attracted much attention due to their unique properties compared to their bulk counterparts. Here we report the synthesis of porous Ag foams on a polished Ag substrate via electrodeposition using the hydrogen bubble dynamic template. The as-prepared porous Ag foams has an average pore size of 10-25μm with the porous wall composed of 40-100nm Ag nanoparticles. CV tests indicate that the competing hydrogen evolution reaction remarkably slow down on porous Ag electrode and the onset potential of CO2 reduction occurs at 0.15V less than that on the Ag foil electrode. Moreover, the high current density and CO faradaic efficiency of over 90% were stable over the course of several hours, whereas Ag foil electrode exhibited the drop of CO faradaic efficiency from 74.4% to 58.6% under identical conditions. We found that the enhanced activity and stability are the result of a large electrochemical surface area (approximately 120 times larger) which can provide more active sites. The noteworthy difference between the two electrodes suggests that the nanostructured surface of porous Ag foams is likely to not only favor the formation of CO2− intermediate but also suppress the competitive reaction of hydrogen evolution. © 2016 Elsevier Ltd. 资助项目: 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/52901
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Wang H.,Han Z.,Zhang L.,et al. Enhanced CO selectivity and stability for electrocatalytic reduction of CO2 on electrodeposited nanostructured porous Ag electrode[J]. Journal of CO2 Utilization,2016-01-01,15