Highly selective and stable electro-catalytic system with ionic liquids for the reduction of carbon dioxide to carbon monoxide |
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| Institution: | 1. Centre for Green Chemistry and Catalysis, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China;3. National Nanotechnology Research Center, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia;1. Department of Mechanical Engineering, the University of Hong Kong, Hong Kong, China |
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| Abstract: | In this study, the electrochemical reduction of CO2 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 (CoCl2). These results indicate that the Ag-modified Cu electrode in EMIMBF4 + BMIMNO3 with CoCl2 exhibited the excellent synergy for the electrochemical reduction of CO2 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 CoCl2 and ILs, serving as the co-catalysts, is probably responsible for the highly selective and stable electrocatalytic reduction of CO2 to CO. |
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