Capacitance properties of electrochemically synthesised polybithiophene- exfoliated graphene composite films

Document Type: Research Article

Authors

Laboratoire d’Electrochimie et Matériaux (LEM), Département de Génie des procédés, Faculté de Technologie, Université Ferhat Abbas, Sétif, 19000, Algeria.

Abstract

The graphene (GR) has attracted intensive interest due to its two-dimensional and unique physical properties. In the present study, the graphene sheets were synthesized by electrochemical exfoliation of graphite in sulfuric acid solution. The polybithiophene-graphene (PbTh-GR) composite films deposited onto indium tin oxide substrate (ITO/PbTh-GR) have been prepared by the incorporation of graphene sheets into the PbTh matrix during electropolymerization under magnetic stirring from the LiClO4/CH3CN electrolyte containing the bithiophene (bTh) monomer and graphene sheets. The incorporation of graphene sheets at different masses (1, 2 and 3 mg) is ensured by the effect of stirring of the electrolyte.
The characterisation of films is effected by electrochemical methods (cyclic voltammetry and impedance spectroscopy), spectroscopic technics (FTIR, UV-visible), X ray diffraction, thermo gravimetric analysis and scanning electron microscopy. It was observed that the electrochemical performances measurements of the ITO/PbTh-GR (3 mg) film show a specific capacity around 65 Fg-1, which is six times higher than that of ITO/PbTh films, 11 Fg-1.

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