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Electrochemical impedance of a polymer-coated electrode with circular delamination around a defect site

✍ Scribed by Karel Micka; Ladislav Kavan

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 484 KB
Volume: 37
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(92)85214-6

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✦ Synopsis

A theory of electrochemical impedance is presented for a smooth metal electrode covered with an insulating film of an organic polymer containing scarcely distributed holes, through which an electrolyte penetrates causing gradual loss of adhesion by electrocapillary effects. The potential distribution in the electrolyte layer under the insulating film during polarization with a small ac voltage is described by a parabolic differential equation which was solved analytically by introducing complex functions and using the method of separation of variables. Representative Rode diagrams were calculated for various values of the input parameters for the cases both without and with an electron transfer reaction.

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Electrochemical impedance of a polymer-coated electrode with circular delamination around a defect site—II. Electrode with a fractal surface

✍ Karel Micka 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 585 KB

Abtstract-A theory of electrochemical impedance was derived for a metal electrode with a fractaf surface covered with an insulating layer of an organic polymer containing scarcely distributed holes, through which an electrolyte penetrates, causing gradual loss of adhesion by electrocapilhuy effects.