Electrochemical reduction of oxygen on small platinum particles supported on carbon in concentrated phosphoric acid—I. Effects of platinum content in the catalyst layer and operating temperature of the electrode

Abstract

Electrochemical reduction of oxygen on small platinum particles supported on carbon in 105 wt% phosphoric acid at 190°C was investigated by means of a half-cell apparatus. Effects of platinum content in the catalyst layer and operating temperature of the electrode on this reaction were examined. The flooded agglomerate model was supported as the operation mode of the porous gas diffusion electrode. From temperature dependence study of the reaction, apparent activation energy on the electrode was estimated to be about 113 kJ mole −1 at equilibrium potential.