Diffusion Phenomenon at Cd²⁺/Au(100)Interface in Underpotential Deposition Region

Abstract

In our laboratory, diffusion phenomenon in underpotential deposition (UPD) region has been studied so far. The effects of anionic species, Cl⁻ and HSO₄⁻/SO₄²⁻, in electrolyte solution on the diffusion phenomenon were investigated by combining electrochemical measurements with in situ electrochemical atomic force microscope(EC-AFM) observation. It has been confirmed experimentally that the inward diffusion of Cd to the Au(100) substrate is promoted when Cl⁻ is present in electrolyte solution.