Adherent electroactive films of poly͑o-phenylenediamine͒ ͑PPD͒ were obtained by electropolymerization of o-phenylenediamine ͑o-PD͒ on 304 stainless steel under potentiostatic conditions. The in situ Fourier transform infrared reflectance spectroscopy study suggests a phenazine ring ladder-structure polymer. Open circuit potential and potentiodynamic studies of PPD-coated steel electrodes, in chloride aqueous solution show a positive shift of the corrosion potential.

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The electro-oxidation of toluene on glassy carbon electrodes in 30% CH 3 CN in H 2 O, using 1.0 M H 2 SO 4 as supporting electrolyte, was studied by electrochemical and spectroelectrochemical techniques. The results suggest that the electro-oxidation is controlled by the charge transfer reaction, followed by a chemical process. Some of the reaction products are electrochemically active and are weakly adsorbed on the glassy carbon surface. Depending on the applied potential, in situ Uv/visible and Fourier transform infrared ͑FTIR͒ studies showed the formation of toluene-oxygenated species and carbon dioxide as principal products. The produced carbon dioxide was quantified using a method based on an ex situ FTIR technique.

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