A Study on Electrochemical Reduction of CO₂ by using the Perovskite Electrode

By using the electrode made of Cu based perovskite which has high conductivity and excellent redox power, the characteristics of electrochemical reduction of carbondioxide were studied. After carbondioxide is dissolved in the KOH electrolyte and carried out electrochemical reduction at the negative potential (range: -2.0 -3.0V vs. Ag/AgCl), alcohois (mathanol, ethanol, and propanol) and acetaldehyde are produced. The total efficiency of products is optimum at -2.0 V vs. Ag/AgCl and with the exception of methanol, the efficiency of products is inversely proportional to the reaction temperature. The optimum reaction temperatures at which the highest efficiency could be got for individual products are 5℃ for acetaldehyed and ethanol, 10℃ for propanol and 30℃ for methanol. And according to the tentative mechanism for the reduction of carbondioxide on the basis of these experimental efficiencies of products, ethanol and acetaldehyde were intermediates in this electrochemical reaction.