The hydrogen overvoltage on palladium in and solutions was determined. Data showed that the overvoltage curves could be divided into three consecutive regions: ( A ) η was linearly dependent on i ; ( B ) there was a Tafel relationship between η and i in which the b slope, depending on the p H of the solution, was equal to 0.030 to 0.042; ( C ) depending on the p H of the solution, there was either a Tafel relationship between η and i with a b slope of 0.12, or η was virtually independent of i ;. Hydrogen overvoltage mechanisms were postulated for each of these regions.
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Hoare et al. (1955) studied this question.