Facile synthesis of cobalt oxide and graphene nanosheets nanocomposite for aqueous supercapacitor application
Rajan Lakra, Rahul Kumar, Prasanta Kumar Sahoo, Deepanshu Sharma, D.N. Thatoi, Ankur Soam
Abstract
The present work includes the fabrication and electrochemical characterization of cobalt oxide (Co3O4)/graphene nanosheets nanocomposite as efficient electrode for supercapacitor application. The characterization techniques involved in this work are scanning electron microscopy and transmission electron microscopy for surface morphology, Raman spectroscopy and X-Ray diffraction for structural analysis. The specific capacitance of Co3O4 with multilayer graphene nanocomposite was determined to be 140 F/g (28 mF/cm2) at scan rate of 20 mV/s. The composite electrode can deliver a power density of 856 W/kg with maintaining energy density of 2.38 Wh/kg. The better performance is due to the synergistic effect of graphene and Co3O4 in the composite.