The absorption and permeation of electrolytically generated hydrogen through thin platinum foils have been observed directly by an electrochemical method. The diffusion coefficient and the associated apparent energy of activation were determined. The concentration of absorbed hydrogen was obtained, and it was shown that atomic hydrogen tends to concentrate in areas of high strain in the metal where it can be in a lower energy state. Hydrogen embrittlement phenomena similar to those found in iron and steel were observed. The variation of cathodic overpotential with time was explained in terms of the change in hydrogen concentration in the bulk of the metal near the cathodic surface.
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Gileadi et al. (1966) studied this question.