Electrical double layer on (111) and (100) faces of silver single crystals in solutions containing ClO4− and F−

Abstract The differential capacitance-potential dependence C ( E ) of electrolytically grown (111) and (100) faces of silver single crystals in diluted solutions of NaClO 4 and KF was studied. Comparison with results obtained in KF solutions shows a concentration-independent shift of E min to more negative potentials and higher values of the reciprocal slope of the C −1 vs. C d −1 plots. The data obtained have been explained as due to a weak specific adsorption of ClO 4 − which is stronger on the (100) face. The influence of water in the double layer on the adsorption has been discussed.