Abstract
The potential dependence of the adsorption of labelled Ca 2+ ions was studied at gold electrodes in alkaline medium (0.1–1.0 mol dm −3 NaOH) at a low Ca 2+ ion concentration. It was found that a significant adsorption occurred at low potentials where the formation of surface oxides cannot be assumed (non-oxide region); only electrosorption of OH − ions is expected on the basis of literature data. It was assumed that the adsorption of Ca 2+ ions is induced by electrosorbed OH − ions. The occurrence of a competitive adsorption between Na + and Ca 2+ ions was shown. It is suggested that the behaviour of the gold/alkaline solution interface should be interpreted in terms of simultaneous adsorption of OH species and cations. It was shown that the formation and ageing of the oxide layer are also accompanied with the adsorption of Ca 2+ ions.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call