Transient charge transport through modified electrodes by EDH impedance - Sorbonne Université Access content directly
Journal Articles Journal of electroanalytical chemistry and interfacial electrochemistry Year : 1988

Transient charge transport through modified electrodes by EDH impedance

Abstract

The first application of Electrohydrodynamical (EHD) impedance [1,2] to the study of the transport properties of the charge carriers in modified electrodes is presented in this note. The specific interest of this technique, which involves a modulation of the rotation speed of a disc electrode, as compared with ac impedance, lies in that the flux of charges injected in the electroactive polymer layer is modulated at a constant potential. It has been shown recently that EHD impedance is a suitable technique for elucidating mass transport of a redox substrate by diffusion through an inert (non-conductive) film [3]. Commonly adopted models for modified electrodes, see e.g. ref. 4, are based on (i) a redox reaction of the mediator couple confined in the polymer layer: P+e-PQ (ii) a redox reaction between the substrate in solution and the mediator: Q + Ak’\P + products (for a reduction) Most generally, four processes may concur to limit the overall reaction rate: (1) substrate (convective) diffusion in solution; (2) substrate molecular diffusion in the layer; (3) charge transfer between Q and A and (4) “diffusion” of electrons in the layer. The location of the mediation reaction at the polymer/ solution interface or in the layer is a result of the relative rates of the above four processes.

Dates and versions

hal-04625793 , version 1 (26-06-2024)

Identifiers

Cite

Claude Deslouis, Claude Gabrielli, M.M. Musiani, Bernard Tribollet, J.F. Equey, et al.. Transient charge transport through modified electrodes by EDH impedance. Journal of electroanalytical chemistry and interfacial electrochemistry, 1988, 244 (1-2), pp.325-332. ⟨10.1016/0022-0728(88)80116-5⟩. ⟨hal-04625793⟩
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