THE REVERSIBILITY AND OVERLAPPING OF HYDROGEN AND OXYGEN ADSORPTION IN THE DOUBLE-LAYER REGION OF RHODIZED ELECTRODES IN H2SO4 SOLUTIONS (THE DECOMPOSITION OF WATER MOLECULES ON RHODIUM SURFACES)

摘要

The voltammetric behaviour of rhodized electrodes (roughness factor values, 15-25) was studied in 1 mol dm(-3) H2SO4 solution in the potential range from 225 to 500 mV/RHE. It was shown that, at appropriately chosen sweep rates and at high current-measuring sensitivities, characteristic voltammograms with a singular point (minimum) could be obtained. Addition of strongly adsorbing chloride ions significantly modifies the picture: the singular point disappears and double-layer-like behaviour can be observed. The phenomena observed are treated and explained in terms of simultaneous adsorption of H and OH species. [References: 11]