Simultaneous Formation of a Polypyrrole Film and a Tantalum Oxide Layer by Electrochemical Oxidation.

Electropolymerization of pyrrole on tantalum (Ta) electrodes was carried out in Britton-Robinson buffer solutions containing 0.1 M (1 M = 1 mol dm−3) potassium chloride (KCl) under galvanostatic conditions. A polypyrrole (PPy) film and a tantalum oxide (Ta2O5) layer are formed on a Ta electrode by one electrochemical oxidation process. The conditions of this simultaneous formation were investigated in respect with the current density, pyrrole concentration, pH, and total charge. Under certain conditions ([py] = 0.5 M, pH = 1.8, current density = 3.5 mA cm−2, charge 1 C), a 5.6 μm thick PPy film was efficiently formed on a homogeneous 45 nm thick Ta2O5 layer.

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