Ohmic resistance of polypyrrole-modified electrodes with incorporated Pt particles

The ohmic resistance of polypyrrole modified electrodes has been determined as a function of the potential by the ac impedance method. It has been found that polypyrrole-modified electrodes have a negligible ohmic resistance in the potential region from 0.2 to −0.2 vs sce. When the potential is decr...

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Bibliographic Details
Published in:Electrochimica acta 1987-08, Vol.32 (8), p.1187-1190
Main Authors: Vork, F.T.A., Janssen, L.J.J., Barendrecht, E.
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
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Summary:The ohmic resistance of polypyrrole modified electrodes has been determined as a function of the potential by the ac impedance method. It has been found that polypyrrole-modified electrodes have a negligible ohmic resistance in the potential region from 0.2 to −0.2 vs sce. When the potential is decreased from −0.2 to −0.3 V, the ohmic resistance shows a sharp increase, due to the transition of polypyrrole from the oxidized, conducting state to the reduced, insulating state. The electrodeposition of Pt particles in the film does not change the resistance at high potentials, but does decrease the rise in ohmic resistance at low potentials. Moreover, this decrease depends on the current density, used for the deposition of the particles.
ISSN:0013-4686
1873-3859
DOI:10.1016/0013-4686(87)80032-4