Abstract
Within the framework of the Alekseev–Popov–Kolotyrkin model combined with a set of Frumkin isotherms, the adsorption of adamantanol (AdOH) molecules is studied in the presence of a surface-inactive electrolyte and chloride ions at the Hg/H2O interface. The position of points at the beginning and in the end of an equilibrium two-dimensional phase transition is shown to be determined by the equality of (a) surface tension and (b) calculated electrode potentials. With these conditions fulfilled in the phase-transition region, the model of two parallel capacitors with a common diffuse layer (in the AdOH + NaF system) transforms into the classical model of two parallel capacitors with two independent diffuse layers. Taking into account the lateral interaction between adsorbed chloride anions and AdOH molecules makes no difference to the two-dimensional phase transition potential at fixed adsorption parameters. The effect of the diffuse layer on the position of two-dimensional phase transition potentials is analyzed.
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Damaskin, B.B., Baturina, O.A. Simulating Coadsorption of Surface Active Anions and Organic Molecules Capable of Forming Two-Dimensional Condensed Layers on the Electrode. Russian Journal of Electrochemistry 37, 121–126 (2001). https://doi.org/10.1023/A:1009019605888
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DOI: https://doi.org/10.1023/A:1009019605888