Abstract
Expressions are derived for the cathodic Tafel slope as a function of both zeta potential and surface heterogeneity. The Tafel slope is shown to depend on the rate of change of zeta potential with the electrode/solution pd in acid, neutral and alkaline solutions. The effect of surface heterogeneity is investigated on the basis of the theory of absolute reaction rates, and comparison is made with the effect of Temkin-type adsorption. It is concluded that the two factors may account for 1.(i) the deviation of the experimental Tafel slope from the values previously associated with simple mechanisms and2.(ii) the occurrence of slopes of 2·303 RT/F frequently observed in the literature.
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