An impedance and chronocoulometric study of the adsorption of chloride and bromide ions on bismuth single crystal planes from solutions in methanol

摘要

The adsorption of Cl~- and Br~- ions on the (111), (001) and (011-bar) planes of a bismuth single crystal electrode from solutions in methanol has been investigated by means of differential capacity and coulometric measurements. The ionic charge due to the specific adsorption has been obtained using the mixed-electrolyte method. The results have been analysed and some characteristics calculated by the simple virial adsorption isotherm and classical inner layer model. It has been found that the difference in the adsorption characteristics for various planes of the Bi single crystal is rather small in methanol and it depends on solvent nature in a quite complicated manner. The analogous difference in inner layer capacity in methanol has been found to be close to that difference in ethanol and water, but much lower than in 2-propanol.