Processes of adsorption/desorption of iodides and cadmium cations onto/from Ag(111)

Abstract

In this work, the adsorption/desorption processes of iodides and cadmium cations in the presence of iodides onto/from Ag(111) were investigated. It was shown that both processes were complex, characterized by several peaks on the cyclic voltammograms (CVs). By PeakFit analysis of the recorded CVs and subsequent fitting of the obtained peaks by the Frumkin adsorption isotherm, the interaction parameter (f) and the Gibbs energy of adsorption (ΔG ads) for each adsorbed phase were determined. In the case of iodide adsorption, four peaks were characterized by negative values of f, indicating attractive lateral interaction between the adsorbed anions, while two of them possessed value of f