Abstract
In this study, the electrochemical reduction of CO 2 was examined using a Ag-modified Cu catalyst cathode in a series of mixed ionic liquids (ILs) in the presence or absence of cobalt chloride (CoCl 2 ). These results indicate that the Ag-modified Cu electrode in EMIMBF 4 + BMIMNO 3 with CoCl 2 exhibited the excellent synergy for the electrochemical reduction of CO 2 to CO with a stable area specific activity, with continuous production for at least 150 h. In such a system, a CO selectivity of 98% was achieved. According to the obtained results, a possible mechanism was proposed. The synergistic effect between the Ag-modified Cu electrode, serving as the main catalyst, and CoCl 2 and ILs, serving as the co-catalysts, is probably responsible for the highly selective and stable electrocatalytic reduction of CO 2 to CO.
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