Abstract
The differential capacitance curves are calculated, by using the model of three parallel capacitors, both for the electrical double layer dense part and the surface layer as a whole, at different ratios of the attraction constants in this model: a 11, a 12, and a 22. It is shown by regressive analysis of the curves that these capacitance curves agree well with the model of two parallel capacitors, provided allowance is made for the linear potential dependence of the effective attraction constant in this model. When allowance is made for the electrical double layer diffuse part, the agreement with the model of two parallel capacitors is still improved, not only at the attraction constant critical value a 12 = 2 but also at its smaller values (1.5 and 1.0). However, at a 12 = 0.5 and rather high concentration of organic substances whose molecules adsorb in two different orientations the curves as if get divided into two parts separated with a maximum that reflects the process of the adsorption layer transformation. Under these conditions the model of two parallel capacitors turns to be inapplicable. It follows from the obtained results that the observed good applicability of the model of two parallel capacitors to the experimental data on the adsorption of numerous aliphatic compounds at electrodes by no means implies that the adsorption layer structure in the studied systems actually corresponds to the physical picture on which the model is based.
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Original Russian Text © B.B. Damaskin, 2009, published in Elektrokhimiya, 2009, Vol. 45, No. 9, pp. 1150–1158.
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Damaskin, B.B. Analysis of equal conformity of differential capacitance curves upon the adsorption of organic molecules with different models of surface layer. Russ J Electrochem 45, 1072–1079 (2009). https://doi.org/10.1134/S1023193509090134
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DOI: https://doi.org/10.1134/S1023193509090134