One of the promising characteristics of graphene is its high specific surface area (2675 m 2 g -1 ), which can rival or even surpass that of both single and multiwalled carbon nanotubes. The lateral sizes and their distribution in solid state, and the resultant open porosity generated between graphene nanosheets are the major contributors to the higher specific surface area of graphene. Another advantage of graphene as supercapacitor electrode material is that both of its major surfaces are exposed, ensuring direct interaction with the electrolyte. This versatility renders graphene a highly promising carbon material for a diverse range of practical applications, spanning novel nanocomposites, sensors, actuators, nanoelectronics and highperformance energy storage devices . Notably, graphene sets the upper limit of EDL capacitance for all other carbon-based materials, with a maximum theoretical specific capacitance of 21 µF cm -2 , and a corresponding specific capacitance of ~ 550 F g -1 , provided the entire 2675 m 2 g -1 is optimally utilized . This distinctive feature positions graphene as an ideal supercapacitor electrode material, driving intensive research within the domain of clean energy related devices.