Electrochemical Synthesis and Characterization of Composites of Conducting Polymers and Nano - structured Metals / Shimaa Muhammad Mahmoud ; Supervised Soher Darwish , Ahmed Galal Helmy

Thesis (M.Sc.) - Cairo University - Faculty Of Science - Department Of Physical Chemistry

Conducting homo - , bilayer - and co - polymers were electrochemically deposited on platinum and glassy carbon surfacesSubmicro - / nano - co - catalysts of palladium and platinum were electrochemically deposited over the conducting polymer surfacesElectrochemical investigation of the resulting films was achieved using cyclic voltammetry , chronocoulometry , and electrochemical impedance spectroscopyDiffusion coefficients were determined for the different films and the effect of changing the synthesis and test electrolytes with the solvent were also comparedOther factor studied was the film thickness and the results showed that a memory effect exists from the synthesis electrolyte that affects the diffusion coefficient valuesFilm modification with the Pt / Pd co - catalyst can be used successfully in the catalytic oxidation of methanol in direct methanol fuel cellsFTIR measurements proved the incorporation of both individual monomers in the copolymer filmsOn the other hand , surface morphology revealed by SEM showed distinct difference between homo - polymeric and co - polymeric structures

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