Abstract
The sintering of electrolytic deposits of Pt and Rh and Pt black in 0.5 M H 2SO 4 and in aqueous solutions of acidified sulphate, chloride, bromide and alkalized sulphate under potentiostatic conditions was investigated. It was shown that curves for the dependence of the degree of sintering on the potential are similar in their shape and in the values of the potentials of the maximum to the curves for the dependence of the changes in the reversible surface work on the potential. The effect of nature of the anions on the degree of Pt sintering is largely determined by the effect of the specific adsorption of the anion on the value of σ. On the basis of the data on the kinetics of the Pt/Pt sintering in sulphate solutions the E act was determined as 54±8 kJ mol −1. It was suggested that the changes in the surface of the Pt during sintering occur chiefly as a result of the migration of vacancies and the surface self-diffusion of platinum atoms which leads to a decrease in the microporosity.
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