Effect of silver ions on codischarge of copper and silver at a platinum electrode at the copper underpotentials

Abstract

Codischarge of copper and silver ions at potentials more positive than the equilibrium potential of the Cu+2/Cu system is studied by the voltammetry technique. At the Ag+ concentrationc below 10-7 M, silver ions make no noticeable impact on the formation of a Cuad monolayer but decelerate that of supermonolayers of Cu at almost equilibrium potentials. Atc ≥ 4 × 10-5 M, voltammograms indicate the concurrent adsorption of Cuad and Agad and the nucleation and deposition of phase Ag