Abstract
It is known that the width of adsorption of a voltammetric peak is defined by lateral interactions in adsorption layer, so the peak width may be a key to intensity of these interactions. Correlation between the width of the peak and interaction parameter G has been examined in details. It is impossible to find the exact equation setting G as a direct function of peak width. Approximate equations are proposed to calculate G from the peak width with high accuracy in a wide range of G values. G value can be useful not only for characterization of lateral interactions in adsorbed layer (for finding adsorption isotherm parameters), but also for quick estimation of adsorption of electroactive substance.
Highlights
Interpretation of a peak shape is a chemometrics problem common within the fields of chromatography, spectroscopy, and voltammetry.[1]
In voltammetry of surface-confined species this problem is simplified, as the peak shape is controlled primarily by the interactions within adsorption layer, or within a thin layer of solid particles confined to the electrode
An adsorption voltammetric peak is observed, with its height proportional to potential scan rate, v. The shape of this peak is determined by the interaction parameter G, which is a quantitative measure of lateral interactions
Summary
Interpretation of a peak shape is a chemometrics problem common within the fields of chromatography, spectroscopy, and voltammetry.[1] In voltammetry of surface-confined species this problem is simplified, as the peak shape is controlled primarily by the interactions within adsorption layer, or within a thin layer of solid particles confined to the electrode At these conditions, an adsorption voltammetric peak is observed, with its height proportional to potential scan rate, v. Where x is the molar fraction of redox forms in adsorption layer (indices O and R correspond to oxidized and reduced forms), Ep is the peak potential It is of importance to set a new equation applicable for a wider range of the interaction parameter
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