Consumption Rate of Pt under Potential Cycling

The consumption rate of Pt in sulfuric acid under potential cycling has been investigated in at as a basic study to understand the consumption rate of the electrocatalyst of polymer electrolyte fuel cells. With a higher potential limit, was vs reversible hydrogen electrode (RHE), the consumption rate was a few for rectangular and symmetric triangular waves, and the consumption rate increased with the up to vs RHE. Among the triangular waves between vs RHE, the consumption rate of symmetric waves and fast cathodic asymmetric triangular waves were a few . However, the slow cathodic triangular wave, which were anodic and cathodic, showed consumption rate. The ratio in the difference of charge to the consumption showed that the electron transfer number was about 2 for the slow cathodic triangular wave, and that of the electron transfer number was about 4 for the symmetric waves and the fast cathodic triangular waves. Therefore, that follows the Pt oxidation, would occur under the enhanced condition, and would occur under symmetric conditions.