ABSTRACT
Some recent progress toward an understanding of the electrolyte–electrode interface is presented. Both screening and dynamic sum rules that must be satisfied by an ionic solution at the interface are discussed. A simple model for interfacial adsorption is presented in which the three–dimensional system reduces to an equivalent two–dimensional lattice gas. This model is used to study the underpotential deposition of copper on the 111 surface of a crystalline gold electrode in the presence of bisulfate. A cluster variation approximation to the model system yields realistic adsorption isotherms, and the resulting model voltammogram agrees well with experiment.
