) formed over the surface of the electrode surface are a function of the potential limit that can be fine-tuned with supplied different potential ranges and that various functionalities influence the areal capacitances. The same material was assembled as symmetric supercapacitor and accomplished the areal specific capacitance of 27.66 mF cm -2 along with 84.37% of capacitance retained after 2500 cycles. The capacitive performance of P-doped graphene reported in the different literatures is displayed in Table .