Electrochemical performance of rGO/AFCNT composite and fabrication of supercapacitor electrode

Abstract

An aqueous electrolyte-based supercapacitor electrode of graphene and amine-functionalized multiwall carbon nanotubes (AFCNT) is reported. Amine groups were covalently introduced on the surface of Carbon nanotubes (CNT) by diazonium reaction. In-situ reduction of graphene oxide over amine functionalized carbon nanotube template resulted the final composite. At current density of 1 A/g the electrode showed 384 F/g specific capacitance. The electrode had an energy density of 53.33 Wh/kg and power density of 499.13 W/kg. The electrode evinced almost 90% of capacitance retention even at elevated current density of 5 A/g. • Composite of Graphene/- NH 2 functioned MWCNT developed for supercapacitor electrode. • Composite shows specific capacitance of 384 F/g at a current density of 1 A/g. • Introduction of hydrophilic amine group prevents the restacking of graphene layers effectively. • The electrode shows retention of 90% capacitance at current density as high as 5 A/g.