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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 9, Number 4
April 20, 1988 

Mechanism of Electropolymerization of Pyrrole in Acidic Aqueous Solutions
Kang-Jin Kim*, Hyung-Soo Song, Jin-Doo Kim
Mechanism of electrochemical polymerization of pyrrole (Py) on a Pt electrode in acidic aqueous solutions was studied by means of potentiostatic measurements, cyclic voltammetry and chronopotentiometry. Pyrrole molecule appeared to be initially oxidized via two-electron transfer step to produce oxidized pyrrole ion (Py+), which was coupled with a non-oxidized pyrrole to yield a dimerized species, Py-Py. The Py-Py thus formed was further oxidized again via two-electron transfer step, which was followed by coupling with non-oxidized monomer and by concomitant expulsion of a H+. Then the latter chain extension process was repeated. The chain extension and polypyrrole oxidation reactions occurred competitively.
248 - 251
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