A g -1 in 6 M KOH aqueous solution to strengthen the capacitance of N-CNF (60.6 F g -1 ) due to the larger SBET of 388.7 m 2 g -1 . Furthermore, the symmetric supercapacitor derived from the hybrid of MnCo2O4@N-CNF-1 achieved the higher energy density of 30.26 Wh Kg 3D-BN-CNF-ZF-900 found to be 351.5 which is comparatively higher than that of 3D-N-CNF-ZF-900 (79.6) and 3D-CNF-ZF-900 (338), respectively. The gravimetric capacitance of 3D-BN-CNF-ZF-900 derived from the GCD curve at 0.5 A g -1 in 2 M KOH aqueous solution calculated to be 295 F g -1 which is drastically superior to 3D-N-CNF-ZF-900 (126 F g -1 ). Based on this result, it has been proposed that the synergistic effect caused by dual atom doping played a significant role towards both surface area as well as electrochemical energy storage performance of carbon-based candidates.