Adsorption of CO2 on Transition Metals and Metal Oxides

The adsorption of CQ on transition metal electrodes was characterized by means of pseudocapacity measurements. It turned out that the metal with high pseudocapacity in CO2-saturated solutions are promising electrocatalysts for the electrochemical reduction of CQ. A correlation was found between the electronic structure of transition metals and their pseudoeapacity and the current efficiency for the reduction of CO2, respectively In recent years the electrochemical reduction of carbon dioxide has received much interest and has been studied in aqueous (e.g., Ref. 1-4) and nonaqueous solutions (e.g., Ref. 5). In aqueous solutions hydrogen evolution is the main concurrent reaction. The selectivity of the reduction is significantly- affected by the adsorption of reactants and intermediates onthe electrode surface. 6-1~ Investigations with mixed oxides based on RuO ~ like RuO2-TiO2 or RuO2-Co304-SnO2-RuO2, ~1prepared by ther-mal decomposition f the appropriate salts, showed a goo