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Pyrrole Polymers as Reference Electrodes

IP.com Disclosure Number: IPCOM000048661D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Diaz, AF: AUTHOR [+2]

Abstract

Interactions of pyrrole polymers with surrounding electrolytic solution have been demonstrated to include a reversible oxidation/reduction of the polymer film. This type of interaction can give rise to a stable junction potential between the film and the solution. Such behavior can be used to produce reference electrodes suitable for use in electro chemical cells.

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Pyrrole Polymers as Reference Electrodes

Interactions of pyrrole polymers with surrounding electrolytic solution have been demonstrated to include a reversible oxidation/reduction of the polymer film. This type of interaction can give rise to a stable junction potential between the film and the solution. Such behavior can be used to produce reference electrodes suitable for use in electro chemical cells.

The particular polymer investigated was the N-methyl derivative of pyrrole, selected because of its stability in air. A thick film, several microns thick, was prepared by the electropolymerization of this pyrrole onto a platinum electrode. This film was then stripped from the platinum. The cyclic volt ammogram of ferrocene in acetonitrile was monitored, using this pyrrole film as a reference electrode. The resulting volt ammogram was very clean and showed all the properties of a reversible wave. The stability of the potential was monitored both by recording the time behavior of this reference electrode potential under open circuit conditions, and also by studying the potential difference between this polymer electrode and a saturated sodium calomel reference electrode. Though the test was not conducted in a thermally controlled environment, stability of the order of a millivolt over tens of minutes was observed. Similar behavior is anticipated for the other polypyrrole polymers which are substituted in the N position with alkyl and/or phenyl groups.

The behavior...