Etude Et Caractérisation Des Matériaux D’électrodes Composites À Base D’un Semi-conducteur Métal.

Résumé: This thesis focuses on the study of the development and characterization of composite electrode materials based on a metal semiconductor for application in rechargeable batteries based on Zn / MnO2. To make this composite material, we follow two steps, the first is a deposit of a conductive polymer (PAN or PPy) on ITO or Platinum and the second is a deposit of Mn or MnO2 on or in the polymer film. The film of the conductive polymer is obtained by electrochemical oxidation (electropolymerization) of the monomer pyrrole (organic medium) or aniline (aqueous medium). The electroplating of manganese or manganese dioxide was first studied on platinum to determine the experimental conditions. The incorporation of Mn or MnO2 in the polymer film was carried out by cyclic voltammetry with two methods, the first is a direct deposit of Mn or MnO2 on the polymer (direct method) and the second requires a soaking of the ITO/PAN or PPY composite electrode to insert the Mn(II) ions into the polymeric matrix, followed by an electrochemical oxidation reaction to form MnO2 or reduction to form Mn in the pores of the polymer. These compost electrodes were used to assess the reduction of hydrogen or oxygen. Finally, we described the manufacture of an electrochemical cell based on a Zn anode and an ITO/PAN/MnO2 cathode. The most efficient battery delivered a maximum power of 6 mW/cm2.

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