Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6609390 | Electrochimica Acta | 2016 | 26 Pages |
Abstract
Electrochemical reduction of CO2 has been studied in 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([Bmim][CF3SO3])/propylene carbonate (PC) solution on Au electrode. The linear sweep voltammetry measurements show that [Bmim][CF3SO3] has significant catalytic effect toward CO2 reduction. In order to study the mechanism of CO2 reduction in [Bmim][CF3SO3]/PC on Au electrode, the electrochemical impedance spectroscopy is employed. The experiment results show that the electrochemical impedance spectroscopy detected in [Bmim][CF3SO3]/PC is different from that detected in tetrabutylammonium trifluoromethanesulfonate ([Bu4N][CF3SO3])/PC solution. The reasonable explanation is that [Bmim]+ is absorbed on the Au electrode, leading to the formation of ionic liquid film. During the CO2 reduction process, absorbed CO2 is reduced to CO2â radical via single electron transfer. The generated CO2â radical interacts with [Bmim]+ and inducing the formation of [Bmim-CO2](ad). Thus, the activation energy and overpotential of CO2 reduction are reduced. The electrochemical impedance spectroscopy can be used as a methods to investigate the mechanism of CO2 reduction in non-aqueous solution.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Dong-wei Yang, Qing-yuan Li, Feng-xia Shen, Qin Wang, Lu Li, Ning Song, Yong-nian Dai, Jin Shi,