CARBON-DIOXIDE HYDROGENATION TO CARBON-MONOXIDE AT THE PLATINUM-ELECTRODE IN A CELL WITH A SOLID OXYGEN-CONDUCTING ELECTROLYTE

The influence, exerted by cathodic and anodic currents on hydrogenatio n of CO2 to CO, is studied on a platinum electrode in the following ce ll with a solid oxygen-conducting electrolyte: CO2 + H-2, Pt\0.9ZrO(2) + 0.1Y(2)O(3)\Pt + PrO2-x, air. The experiments are conducted at the atmospheric pressure and a temperature of 750 degrees C, with the reac tion mixture varied in a wide composition range. The current (oxygen f low through electrolyte) is shown to alter the CO formation rate as co mpared with its value under open-circuit conditions. The CO formation rate decreases or increases at the anodic or cathodic polarizations of the electrode, respectively. The influence, exerted by the polarizati on of the platinum electrode-catalyst on the CO formation rate is reve rsible and of a faradaic nature.