Simulation of coadsorption of inorganic ions and organic molecules on electrodes

Electrode coadsorption of two components, one of which reduces the dense-la yer capacitance and the other leaves it unchanged, is examined within the f ramework of Alekseev-Popov-Kolotyrkin model supplemented by Frumkin isother m. The adsorption behavior of model systems 0.1 M NaF + n-C4H9OH and 0.1 M NaCl + n-C4H9OH is analyzed, and the results of calculations are compared w ith experimental data. It is shown that, in choosing the electrical variabl e for the adsorption of components that reduce the dense-layer capacitance, the preference should be given to the potential drop in the dense layer. I t is concluded that the height of anodic maximum in C vs. E curves can serv e as a criterion of the lateral interaction between coadsorbed particles at the known parameters of individual adsorption.