Electroreduction of carbon dioxide: Part III. Adsorption and reduction of CO2 on platinum |
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Authors: | YuB Vassiliev VS Bagotzky NV Osetrova AA Mikhailova |
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Institution: | A.N. Frumkin Institute of Electrochemistry, Academy of Sciences of te USSR, Moscow U.S.S.R. |
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Abstract: | The main properties of reductional adsorption of CO2 on the platinum metals are studied. Chemisorbed particles are found to be produced only on platinum and rhodium. Electroreduction of CO2 on these metals proceeds as a result of the interaction of CO2 molecules activated in the course of adsorption on the metal surface with chemisorbed hydrogen. As a result, strongly chemisorbed particles are obtained on the surface which are the products of more profound reduction of CO2 than to formic acid. The further reduction of these chemisorbed particles, accompanied by their desorption into the solution, is very slow due to very strong coupling of sorbed particles with the surface and to very fast backward adsorption of the reduction products. Neither reductional chemisorption of CO2 nor interactions of CO2 with adsorbed hydrogen were observed for iridium, palladium, osmium or ruthenium. |
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