DOI: 10.1016/j.jcou.2019.02.007
Scopus记录号: 2-s2.0-85062190376
论文题名: Enhanced selectivity of carbonaceous products from electrochemical reduction of CO 2 in aqueous media
作者: Xiang H. ; Rasul S. ; Scott K. ; Portoles J. ; Cumpson P. ; Yu E.H.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2019
卷: 30 起始页码: 214
结束页码: 221
语种: 英语
英文关键词: Aqueous electrolyte
; CO 2 electrochemical reduction
; Electrochemical catalysis
; Gas diffusion electrode
; Selectivity
Scopus关键词: Carbon dioxide
; Catalyst selectivity
; Catalysts
; Diffusion in gases
; Electrochemical electrodes
; Electrolytes
; Electrolytic reduction
; Ethanol
; Ethylene
; pH
; Potassium hydroxide
; Reaction kinetics
; Surface reactions
; Aqueous electrolyte
; Carbonaceous products
; Catalyst surfaces
; Electrochemical catalysis
; Electrochemical reductions
; Faradaic efficiencies
; Gas diffusion electrodes
; Reduction process
; Copper compounds
英文摘要: This study highlights the importance of CO 2 supply method and impact of electrolyte alkalinity in aqueous electrochemical CO 2 reduction using Cu x O catalyst. Two different CO 2 supply methods using a two-chamber (2C) cell with CO 2 purging into catholyte and a CO 2 gas diffusion electrode (GDE) cell were compared. Faradaic efficiency (FE) of carbonaceous products in GDE cell was more than 3-folds higher than the 2C cell due to improved CO 2 mass transfer. From the investigation of alkaline catholyte in GDE cell, the higher catholyte alkalinity led to higher current density and higher FE of carbonaceous products with a better selectivity of C 2 (ethanol and ethylene). The reason lies in the OH groups around catalyst surface which improve the reaction kinetics and moreover stabilize the catalyst surface oxygen during the reduction process. With the potential of -1.17 V (RHE) in 2.0 M KOH, C 2 FE of 40% and current density of -234 mA cm -2 were achieved. The production rate of ethylene and ethanol was respectively 0.105 mg min -1 and 0.035 mg min -1 on 2 cm 2 electrode with CO 2 flow rate 15 ml min -1 , which are promising for further development and scale-up. © 2019 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117286
Appears in Collections: 气候变化与战略
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Recommended Citation:
Xiang H.,Rasul S.,Scott K.,et al. Enhanced selectivity of carbonaceous products from electrochemical reduction of CO 2 in aqueous media[J]. Journal of CO2 Utilization,2019-01-01,30