Effect of the metal nature on the n-butanol adsorption in the absence of the metal-water chemisorption interaction

The data obtained for Hg, Bi-Ga, Pb-Ga, Sn-Ga, and Tl-Ga electrodes in combine confirm the suggestion that the using the quantity ΔGA0 and the potential of the cathodic adsorption-desorption peak Edes (expressed in the rational scale) as criteria of the metal-water chemisorption interaction (of the metal hydrophilicity) is only possible when the “electronic” capacitances of the compared metals coincide at the charges where the metal-water chemisorption interaction is absent. In the general case when the “electronic” capacitances do not coincide, some corrections must be introduced. In particular, when the quantity ΔGA0 is used as a criterion, the correction that allows for the effect of the metal nature on the n-C4H9OH adsorption energy in the absence of the metal-water chemisorption interaction (ΔMHgGA0)phys must be introduced. If, then, Edes is used as a criterion of the metal-water chemisorption interaction, two corrections must be introduced, the first of which allows for the potential drop associated with the unequal “electronic” capacitances of the metals; the other, for the potential drop which is due to the different adsorbability of the organic substance at different metals in the absence of the metal-water chemisorption interaction.