Abstract
The admittance of a rotating‐disk copper electrode in 
has been measured as a function of frequency, potential, and concentration. A theoretical analysis of the Mattson‐Bockris model incorporating finite exchange currents for the redox and crystallization reactions and diffusion of both cuprous and cupric ions leads to a simple equivalent circuit representation. Although this basic electrode model provides an adequate explanation for results at the equilibrium potential, substantial deviations occur at anodic potentials due to disproportionation. 10−5M chloride concentrations lead to formation of a surface monolayer which alters relaxation at both anodic and cathodic potentials. No evidence was found for the conventional adatom relaxation process.