The application of the modified Gouy–Chapman theory to an electrical double layer containing asymmetric ions

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Abstract
The modified Gouy–Chapman theory of the electrical double layer in which ion-core effects among the ions are neglected, but are taken into account in the ion–electrode interaction, is applied to the case of 1:1, 2:2, 1:2, and 2:1 electrolytes for both equal and unequal ionic diameters. At large charge densities on the electrode, the counterions dominate and the results approach those of a symmetric electrolyte. However, at small charge densities on the electrode, the effects of asymmetry are evident. In particular, for unequal ionic diameters, a nonzero potential can occur at zero charge on the electrode, even in the absence of specific adsorption.

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