Electrocatalytic Deposition of Polypyrrole

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Abstract
In the presence of a small amount of bromide, the deposition of polypyrrole is possible at appreciably higher current densities than in the absence of a catalyst. The mechanism is assumed to involve the reaction of pyrrole with bromine in the form of Br3 to give [Br3]⊖ and the pyrrole radical cation. The latter then undergoes addition at the 2 position with a second radical cation or with a neutral pyrrole molecule, a CC bond being formed. The dimers are readily oxidized further, resulting in the formation of polymers. The [Br3]⊖ ion is reoxidized at the electrode.