Abstract
Underpotential deposition (UPD) of Zn 2+ at Au(111) in phosphate solution with Cl −, Br −, and I − was studied by cyclic voltammetry (CV), focusing on the effects of halide species on Zn UPD for the determination of the induced anion adsorption on the UPD. The order of the adsorption strength of the induced anion on Zn UPD was found to be different from that of the specific adsorption of I −>Br −>Cl −> PO 3− 4 ≥ SO 2− 4 > ClO − 4 at a substrate Au electrode. The adsorbed anions induced on Zn UPD are not suggested to be halide ions but phosphate ions. Such anomalous tendency of anion behavior has been recently proved for induced sulfate and phosphate adsorption behavior on Zn UPD at a Pt electrode in the presence of chloride by the radiotracer method. This paper shows that the anomalous induced phosphate adsorption on Zn UPD also takes place at Au(111) not only in the presence of chloride or bromide, but also in the presence of iodide in a phosphate solution.
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