We present the electrochemical results of highly porous and interconnected carbon material by activation
of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F.
Asymmetric supercapacitor devices were fabricated using the activated material (GF/PVA-F) and activated
carbon (AC) as the positive and negative electrodes respectively. The device exhibited a maximum
energy density of 42 mWh cm 2, a power density of 0.5 W cm 2 and 98% retention of its initial
capacitance after 2000 cycles in an extended cell potential window of 1.8 V in 1 M Na2SO4 aqueous
electrolyte. This work shows the great potential of this material for high performance energy storage