ChemInform Abstract: Anion Effects on the Underpotential Deposition of Lead on Cu(111)

Abstract

ChemInform Abstract have been investigated in solutions containing perchlorate, acetate, or chloride (pH 1.5-3.55) by voltammetric and complex potential controlled perturbation techniques. The underpotential deposition of Pb on Cu(111) is found to be highly irreversible and to be dependent on pH, the electrical history of the metal-electrolyte interface, and the anions present. A critical threshold potential for thecathodic monolayer formation is revealed. The observed nucleation like behavior is interpreted in terms of a negative 2-D nucleation within a preformed surface layer consisting of oxygen-containing species.