The adsorption of the benzene m-disulphonate ion on a mercury surface from aqueous solution has been studied by measuring the interfacial tension and the capacity of the electrode as a function of concentration at four temperatures. The adsorption can be fitted by a Temkin isotherm from which the amounts adsorbed are obtained. The inner layer capacity is analyzed into its components and these are related to the thicknesses of the inner and outer Helmholtz layers. The breakdown of the assumption that adsorbed anions produce a constant field in the inner layer is discussed and a reliable method for calculating the potential at an anion site and Stern's specific adsorption potential is proposed.
Experimental measurements designed to test a specific model of the Pt-Teflon bonded electrode are described. The model assumes that the catalyst agglomerates are filled with electrolyte and that the Teflon binder creates hydrophobic channels, providing effective gas penetration. The electrochemical measurements of surface area and distribution of adsorbed charge formed by reduction of CO2 or oxidation of C3Hs were carried out for a series of electrodes of different structure. Comparisons are made with BET surface area and pore volume distribution. The results presented are consistent with the proposed model.
The adsorption of the p‐toluenesulfonate ion on a mercury surface from aqueous solution has been studied by measuring the interfacial tension and the capacity of the electrode as a function of concentration. An interpretation of the results is proposed in terms of two orientations of the adsorbed ion. A simple model of this type of system is proposed, at first neglecting interaction between adsorbed ions other than due to their space‐filling properties. A very approximate allowance for interaction is introduced, and it is concluded that consideration of interaction is essential for a full description of the system.
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