Voltammetric Response Accompanied by Inclusion of Ion Pairs and Triple Ion Formation of Electrodes Coated with an Electroactive Monolayer Film

Potential distribution at the electrode/solution interface is discussed for metal electrodes coated with a redox-active self-assembled monolayer, taking inclusion of ion pairs and triple ion formation into consideration. Theory on current−voltage curves obtained by potential sweep experiments is derived for these special cases. Explicit expressions derived in this study for the peak current and the peak potential are similar in their forms to those published previously using the Frumkin adsorption isotherm. A graphical method to evaluate the average local potential in the double layer of real systems is proposed.