Four layer model of the energetically heterogeneous electrolyte/metal oxide interface applied for the quantitative description of simple ion adsorption and related calorimetric effects

摘要

A theoretical method is used to describe adsorption on the heterogeneous solid surfaces. The four layer model assuming that the anions and cations of the inert electrolyte (1:1) are adsorbed in two distinct layers, located at different distances from the surface is proposed. The theoretical development has been based on the 2-pK charging mechanism. This model includes a complete thermodynamic description (including that of the enthalpic effects) based on such a modified four layer model along with the comparison to the four layer model assuming that the oxide surface is geometrically and energetically homogeneous, as well to the triple layer model assuming that the oxide surface is an energetically heterogeneous one.