Abstract
The formation of a copper adatom layer on polycrystalline platinum in a copper sulfate solution is studied by cyclic voltammetry in different cycling ranges at 0.1 V s–1. The copper adatom deposition kinetics is controlled by the following factors. The substrate's top layer structure during the oxygen exit onto the surface may be unstable at anodic limits Ea = 0.90–1.35 V. The concentration of copper oxides (active centers) may be higher at Ea = 0.8–0.95 V. The balance between different adsorption sites differs in different cycling conditions. Of importance is the number of complexes Oss–Ptn–SO4 and Oss–Ptn–Oc, where Oss is subsurface oxygen and Oc is chemisorbed oxygen.
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