The poly(aniline-co-ortho-phenylenediamine) modified composite graphite (poly(Anico-oPDA)/CG)) has shown excellent electrocatalytic response towards the oxidation of ascorbic acid (AA). The anodic peak potential (E pa ) of AA has shifted from +0.48 V (bare CG) to +0.17 V (poly(Ani-co-oPDA/CG)). The anodic peak currents (I pa ) are linearly dependent upon the square root of scan rate indicating a favourable diffusion controlled process. The electro oxidation of AA on poly(Ani-co-oPDA/CG is more feasible in acidic medium than in either neutral or alkaline medium. This is shown by negative shift of E pa . The charge transfer resistance (R ct ) at the poly(Ani-co-oPDA/ CG) shows that the rate of the electro oxidation of AA changes with electrode potential. The R ct and diffusion process are dependant not only on applied potential and electrode material but also on the AA.The poly(aniline-co-ortho-phenylenediamine) modified composite graphite (CG) electrode has shown excellent electrocatalytic response towards the oxidation of ascorbic acid (AA). Charge transfer resistance (R ct ) at the poly(Ani-co-oPDA/CG) shows that the rate of the electro oxidation of AA changes with electrode potential.

In this research, we reported the electrosynthesis of platinum nanoparticles on Polyaniline (PAni) modified electrode. The modified electrodes were prepared by incorporation of aniline and platinum salt [H 2 (PtCl 6 ), 6H 2 O] in phosphoric acid medium with KCl solution on composite graphite (CG) surface via cyclic voltammetry (CV) method. The synthesized platinum nanoparticles were characterized by using scanning electronic microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The electro oxidation of methanol was investigated at the surface of these modified electrodes using CV method. It was found that methanol was oxidized with platinum embedded on the surface of PAni modified electrodes during the anodic potential sweep. Moreover, several impact factors such as scan rate, potential and concentration of methanol were studied on the oxidation of methanol toward electrosynthesized electrodes.

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