Abstract
The specific adsorption of anions at positive electrodes from solutions of low ionic strength is examined on the basis of the electrostatic (Stern-Levine) model for specific ionic adsorption. It is shown that as the ionic strength is decreased, the adsorbed charge density falls below the electronic charge density on the metal; for these conditions, high positive potentials are expected at the outer Helmholtz plane. The above model predicts that there is no extended potential region where the diffuse-layer charge is zero. Difficulties in estimating the potential drop across the diffuse layer in dilute solutions are discussed and a possible defect in the simple application of the Stern-Levine model pointed out.
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