High Capacitive behaviour of nanostructured manganese oxide filmsprepared by galvanostatic electrodeposition

Type : Article de conférence
Auteur(s) :  N. Boukmouche, N. Azzouz, L. Bouchama, J.P. Chopart
Année :  2012
Domaine : Chimie
Conférence: 3ème Conférence Internationale sur le Soudage, le CND et l’Industrie des Matériaux et Alliages (IC-WNDT-MI’12)
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Fulltext en PDF :  (.pdf)
Mots clés :  galvanostatic deposition, MnO2 thin film, supercapacitors

Résumé : 

The manganese dioxide thin films nanostructured MnO2 was successfully electrodeposited onto graphite electrode in a bath containing [Mn(CH3COO)2 4H2O] aqueous solutions. The MnO2 thin films were studied by X-ray diffraction analysis (XRD), followed the observations by the scanning electron microscope (SEM) and atomic force microscope (AFM), with a crystalline structures andmany small nanowires. The electrochemical characterization was performed using cyclic voltammetry CV), showing capacitive behavior in the voltage 1.4 V/SCE in 0.5 M Na2SO4 electrolyte solution. The supercapacitance obtained is 136 F.g-1. In addition, the electrochemical process, such as ion transfer and surface capacitance, was also investigated with electrochemical impedance spectroscopy. The long cycle-life and stability of the MnO2 coatings on graphite via the presented electrodeposition were also demonstrated.