Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases · 1974 · 1.3K citations · 0 references
Natural SciencesChemistryMaterials ScienceInterface ScienceSurface ChemistrySurface ScienceElectrical Double LayerElectrode-electrolyte InterfacesInterfacial ElectrochemistrySurface AdsorptionSurface ChargeSurface PhysicsAqueous Electrolyte SolutionsBinding Site ModelingCharge Distribution At InterfacesElectrode Surface StructureIonizable Surface GroupsSurface Charge PropertiesSurface Functional GroupsSurface Potential
A site-binding model of the oxide/aqueous electrolyte interface is introduced, in which it is proposed that the adsorbed counter ions form interfacial ion pairs with discrete charged surface groups. This model is used to calculate theoretical surface charge densities of the potential-determining (H+/OH–) ions and the potential at the Outer Helmholtz Plane, which are shown to be consistent with experimental data for oxides. An explanation is provided for the difference between silica and most other oxides in terms of the dissociation constants of the surface hydroxyl groups.