The NMCNFs-900 bearing nitrogen level of 6.5 wt. % achieved the gravimetric capacitance of 327.3 F g -1 at 1 A g -1 in 6 M KOH aqueous solution along with 93% retention of capacitance after 10000 cycles at 20 A g -1 . The increased performance towards energy storage is attributed to (i) SBET of NMCNFs-900 (926.4 m 2 g -1 ) is larger than CNFs-900 (208.03 m 2 g -1 ) as observed from Fig. and (ii) the contents of both oxygen as well as nitrogen of NMCNFs-900 are found to 11.55 and 6.5 wt. % which are comparatively higher than those of CNFs-900 (9.3 and 6.2 wt. %), respectively. Furthermore, the capacitance of NMCNFs-900 is found to higher than CNFs-900 due to N-doping as displayed in Fig. CNFs by electrospinning of RGO-Ag nanoparticles with PAN followed by stabilization at 300