DOI: 10.1016/j.jcou.2017.02.003
Scopus记录号: 2-s2.0-85012048754
论文题名: Methanol electrosynthesis from CO2 at Cu2O/ZnO prompted by pyridine-based aqueous solutions
作者: Albo J. ; Beobide G. ; Castaño P. ; Irabien A.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 18 语种: 英语
英文关键词: CO2 reduction
; Copper oxide
; Electrochemistry
; Methanol
; Pyridine-based molecular catalysts
Scopus关键词: Catalysts
; Copper oxides
; Diffusion in gases
; Efficiency
; Electrochemistry
; Electrolytes
; Electrolytic reduction
; Ethylene
; Methanol
; Pyridine
; Reduction
; Solutions
; Electrochemical reductions
; Electron-withdrawing substituents
; Faradaic efficiencies
; Gas diffusion electrodes
; Methanol formations
; Molecular catalysts
; Product selectivities
; Reaction performance
; Carbon dioxide
英文摘要: Graphical abstract: In this study, we examine the electrochemical-driven reduction of CO2 to methanol at Cu2O/ZnO gas diffusion electrodes in soluble pyridine-based electrolytes at different concentrations. The process is evaluated first by cyclic voltammetric analyses and then, for the continuous reduction of CO2 in a filter-press electrochemical cell. The results showed that the use of pyridine-based soluble co-catalysts lowered the overpotential for the electrochemical reduction of CO2, enhancing also reaction performance (i.e. reaction rate and Faradaic efficiency). Reaction outcome is discussed on the basis of the role that N-ligands play on the mechanism and the inductive effect caused by the electron-releasing or electron-withdrawing substituents of the aromatic ring. In particular, the maximum methanol formation rate and Faradaic efficiency reached at the 2-methylpyridine (with electron-releasing substituents)-based system with a pH of 7.6 and an applied current density of j=1mAcm−2 were r=2.91μmolm−2s−1 and FE=16.86%, respectively. These values significantly enhance those obtained in the absence of any molecular catalyst (r=0.21μmolm−2s−1 and FE=1.2%). The performance was further enhanced when lowering the electrolyte pH by adding HCl (r=4.42μmolm−2s−1 and FE=25.6% at pH=5), although the system showed deactivation in the long run (5h) which appears largely to be due to a change in product selectivity of the reaction (i.e. formation of ethylene). © 2017 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52785
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Albo J.,Beobide G.,Castaño P.,et al. Methanol electrosynthesis from CO2 at Cu2O/ZnO prompted by pyridine-based aqueous solutions[J]. Journal of CO2 Utilization,2017-01-01,18