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.
F. R. Smith and C. Su, J. Chem. Soc., Chem. Commun., 1972, 159 DOI: 10.1039/C39720000159
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