Enthalpies of activation for the iron(II)–iron(III) redox reaction at platinum and palladium electrodes in chloride and sulphate media
Abstract
Exchange current densities and enthalpies of activation for the Fe2+–Fe3+ redox reaction depend on the nature of the metal electrode in sulphate medium, ΔH‡ being 6·0 kcal g ion–1 at Pt and 8·5 kcal g ion–1 at Pd; in 6M HCl, however, ΔH‡ is almost independent of the metal, being 4·0 and 3·6 kcal g ion–1, respectively, at Pt and Pd.