Palladium and platinum hydrogen electrodes I: Hydrogen chemical potentials, molecular hydrogen diffusion and local cell hydrogen transfer effects at palladium and platinum electrodes under open-circuit conditions and during constant current and pulsed current electrolysis in hydrogen-saturated solutions

Abstract

Measurements at 25 °C are reported of open-circuit electrode potentials and hydrogen overpotentials at both static and rotating palladized palladium electrodes in hydrogen-saturated catholytes, and of the potential responses of platinum black and palladium black electrodes surfaces to square wave current pulses. The results are consistent with governing influences of rates of diffusive transport of molecular hydrogen through the Brunner-Nernst interfacial solution layer, and of local cell hydrogen transfer processes, in contrroling hydrogen chemical potentials at the electrode surfaces.