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Impedance analysis of polymer film electrodes

✍ Scribed by G. Láng; J. Bácskai; G. Inzelt

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
718 KB
Volume
38
Category
Article
ISSN
0013-4686

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✦ Synopsis

Abratract-A new model is elaborated which can explain some anomalies of the impedance spectra of polymer films on electrodes. The model assumes two capacitances associated with the double layers at the substrate/film and at the film/solution interfaces, respectively. The latter capacitance is considered as a constant phase element due to the inhomogeneity of the polymer network and to energetically nonequivalent bonding sites for counterions. The effect of a low dc current, ie a slow reaction of the redox sites in the !?lm with solution species, is also investigated. The electrochemical impedances characteristic of the model have been derived. The simulated impedance spectra were compared with those obtained experimentally.

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