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Preparation of reduced graphene oxide/cobalt oxide nanocomposites as supercapacitor electrode
Paper ID : 2381-UFGNSM13-FULL
Authors:
Abstract:
The well-documented novel performances of graphene make it a potential candidate for a wide range of utilizations, driving research into exploiting unusual properties of this wonder material. Graphene nanosheet composite has been synthesized by hydrothermal method and followed by thermal decomposition step. Field emission scanning electron microscopy and transmission electron microscopy observation reveals the homogeneous dispersion of Co3O4 nanoparticles (3–8 nm in size) on graphene sheets. Electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 504 F/g has been obtained at a current density of 3 A/g in 2 M KOH aqueous solution for Graphene/Co3O4 composite. Furthermore the composite exhibits excellent long cycle life along with ∼94% specific capacitance retained after 2000 cycle tests at high current density of 3 A/g. The prepared composite are expected to have potential applications in supercapacitor as electrical energy storage.
Keywords:
Graphene , Cobalt Oxide, nanocomposite, supercapacitor,
Status : Paper Accepted (Oral Presentation)