Kinetics of film-coated electrodes: Effect of a finite mass transfer rate of substrate across the film—solution interface at steady state

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Abstract

Previous models for describing the mediation kinetics of film-coated electrodes quantitatively are extended to account for a finite mass transfer rate of the substrate across the film—solution interface. Experimental data from polymer-coated rotating disk electrode experiments, analyzed by the extended model, provide evidence for finite interfacial mass transfer rates. Substrate size and charge contribute to this interfacial rate. Interfacial mass transfer resistance is more pronounced for polymerized films such as poly(vinyl ferrocene) and poly[Ru(vbpy)3]2+ than for highly swollen polymers which bind electroactive species, e.g., poly(lysine).

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