Preliminary Investigations of the Electrochemical Behaviour of A Class of Conducting Polymers
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Date
1994-06
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Addis Ababa Universty
Abstract
The electrochemical polymerization of monomers of pyrrole,
thiophene, and aniline on platinum and glassy carbon electrodes
was carried out with dc cyclic voltammetric technique. The
oxidation peak potentials for both the monomers and the polymer
films in different base electrolytes were determined by using
dc cyclic voltammetry. The redox reversibility of equimolar
concentrations of the (Fe (CN) 61 4-/3- couple in 0.1 M KCl on
polymer coated electrodes has been compared with that on bare
platinum and glassy carbon electrodes with dc cyclic
voltammetry. The polymer coated electrodes have shown wider
peak separations compared to the bare electrodes. Higher or
lower peak currents were observed for the redox reaction of
(Fe(CN)6 14-/3- systems in 0.1 M KCl depending upon the type of
polymer films and the nature of base electrolytes used in the
electrochemical polymerization process.
The diffusion coefficients of [Fe(CN)614- and [Fe(CN)6l 3- in
0.1 M KCl were evaluated on polymer coated electrodes from
rotating disk electrode experiments. The results were compared
with the diffusion coefficients of these electroactive species
on bare platinum and glassy carbon electrodes. These results on
the bare electrodes are in good agreement with literature
values. Attempts have also been made to correlate the
diffusion coefficients of [Fe(CN)61 4-/3- systems on polymer coated
electrodes with the type of polymer film and the nature of base
electrolytes.
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Keywords
electrochemical polymerization