Supercapacitors are recently receiving a lot of attention because of its long lifetime and high power density in comparison with rechargeable batteries.However, its low energy density has limited its use for numerous possible applications.The energy density of supercapacitors has been reported to be mainly associated with the specific surface area of electrode material as well as its electric conductivity.Hence, various efforts including hetero ion doping, functionalization and so on have been made to further modulate the physical properties of graphene.In particular, one of the successful hetero ion doping was nitrogen doping because it could help to increase the space charge capacitance of graphene by enhancing its electrical conductivity.