Abstract：In order to investigate the effects of solvent and supporting electrolyte on the electroreduction of CO2, the constant potential electrolysis (CPE) and cyclic voltammetry (CV) experiments were conducted on Ag electrode in a three-electrode electrolytic cell. The results showed that the Faradic efficiency of CO obtained in acetonitrile was the highest compared to those in methanol and DMF. The overpotential of CO2 reduction decreased and the partial current density of CO(CDCO) increased when strong acid was used as the supporting electrolyte in the anolyte. The overall efficiency of CO2 reduction was further enhanced when the ionic liquid (IL) was used as the supporting electrolyte in the catholyte. Comparing the performances of various ionic liquids on CO2 reduction, it was found that the cationic group in IL had much more significant impact on the value of CDCO than that of the anionic group. Based on these observations, it could be confirmed that it was the imidazole cation that played the major catalytic role.
Wang Qianqian,Chen Chengzhen,Zhang Zhipan et al. Effects of Electrolyte Solution Composition on Efficiency of CO2 Electrochemical Reduction[J]. 化学反应工程与工艺, 2016, 32(4): 359-365.
