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

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 exten...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry and interfacial electrochemistry 1985-01, Vol.187 (2), p.205-227
Main Authors: Leddy, Johna, Bard, Allen J., Maloy, J.T., Savéant, J.M.
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Electrochemistry
Electrodeposition
Exact sciences and technology
General and physical chemistry
Study of interfaces
Transport phenomena
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Summary: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).
ISSN:0022-0728
DOI:10.1016/0368-1874(85)85779-8