Abstract
In this work we briefly review the theoretical basis for the electrochemical rectification in mediated redox reactions at redox polymer modified electrodes. Electrochemical rectification may have two distinct origins. It is either caused by a slow kinetics of the reaction between the external redox couple and the mediator or it is originated by a slow electronic transport within the film under an unfavorable thermodynamic condition. We show experimental results for the redox mediation reaction of poly( o-aminophenol) (POAP) on the Fe 2+/3+ and on the Fe(CN) 6 3−/4− redox couples in solution that prove the proposed mechanisms of electrochemical rectification.
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