SYNTHESIS OF NITROGEN-DOPED GRAPHENE VIA THERMAL TREATMENT OF GRAPHENE OXIDE WITHIN METHYLIMIDAZOLE AND ITS CAPACITANCE PERFORMANCE AS ELECTRIC DOUBLE LAYER CAPACITOR

Nitrogen-doped graphene was successfully synthesised from graphene oxide (GO) and 2-methylimidazole composite via thermal treatment under argon flow at 700°C within 1h. This synthesised N-doped graphene exhibits homogeneous nitrogen doping with concentration of ~5% in three different nitrogen configuration namelypyridinic N, pyrrolic N and graphitic N. The electric double layer capacitor (EDLC) made up with this N-doped graphene showed excellent specific capacitance 274 F/g at current density of 1A/g, which was ~7 times higher than GO. This EDLC capacitor showed excellent cyclic stability up to 5000 cycles with capacity retention of ~91%.