In gave the maximum gravimetric capacitance of 495 F g -1 at 0.5 A g -1 in 1 M H2SO4 which is higher than CNF (73 F g -1 ) and plasma treated CNF (405 F g -1 ). Moreover, the assembled symmetric cell produced the maximum energy density of 12.2 Wh Kg -1 with 94% of capacitance retained after 10000 cycles. The electrochemical supercapacitive performance of heteroatom doped CNFs and its composites from the various reports is listed in Table . The order of gravimetric capacitance (F g -1 ) in 6 M KOH aqueous solution at 0.2 A g -1 is NMPC (396.5) >ANPC (325) > NPC . Also, the longer stability with 95.9% retention of capacitance was observed after 2000 cycles at 50 mV s -1 for NMPC. The augmented capacitance was because of the higher SBET and pore volume of 2154.5 m 2 g -1 and 1.25 cm 3 g -1 , respectively. Eventhough, the content of nitrogen in NMPC is lowest among three (2.4 at. %), the level of oxidized nitrogen in NMPC is highest at. %) and readily attracts the anions of the electrolyte leading to the improved wettability and the capacitance. found to be 168 F g -1 at 5 A g -1 in 1 M Na2SO4 aqueous solution which is superior to N-DMCF-600 (143.5 F g -1 ) and N-DMCF-800 (126.3 F g -1 ) because of larger SBET and pore size of 60.8 m 2 g -1 and 30 nm, respectively. It was found that both pore size and SBET increases while the content of nitrogen diminishes with increase of carbonization temperature. The N-DMFC-900 electrode displayed the 92% retention of capacitance after 11000 cycles at 5 A g - the XPS deconvoluted N 1s spectrum illustrated that the content of quaternary nitrogen in N-DMFC-900 is comparatively higher than those of pyridinic and pyrrolic nitrogen but the reverse situation is observed for the N-DMFC-600. Hence it was verified that the quaternary nitrogen too accountable for improving the capacitance of N-doped carbon materials. Xu et al.