Electrocatalytic Oxidation of Ethanol on Glassy Carbon Electrode Modified by Platinum Nanoparticles Dispersed into MMT/PANI/CS Composite Films

In this research work, montmorillonite/polyaniline/chitosan/platinum (mmt/pani/cs/pt) nanocomposite is used as an effective and novel catalyst for electrooxidation of ethanol. the glassy carbon electrode surface is coated with mmt/pani and chitosan by applying a constant potential. thereafter, the surface of the gce is potentiostatically coated with platinum nanoparticles. the constructed electrode is referred to as: gce/mmt/pani/cs/pt. the electrooxidation of ethanol molecules on the surface of mmt/pani/cs/pt electrode is studied using various electrochemical methods such as cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy (eis). the experimental results, indicate that the gce/mmt/pani/cs/pt electrode possess a higher catalytic activity for ethanol electrooxidation compared to the gce/pt electrode. the tafel plots indicate a better kinetic for ethanol electrooxidation in the presence of mmt/pani/cs. the effect of various parameters on electrocatalytic oxidation of the ethanol molecules, such as the amount of platinum nanoparticles, mmt/pani and ethanol concentration on the modified electrodes is investigated for electrooxidation of ethanol molecules using the gce/mmt/pani/cs/pt electrode. the optimum conditions are obtained with 0.011 mg cm^-2 pt nanoparticle, 0.08 w/v% mmt/pani and 1 m ethanol.