and electrolyte that appreciably responsible for the excellency in capacitance. This observation was supported by the fact that the Rct value derived from the EIS Nyquist plot for core-shell NiCo2N@NGhybrid is found to be 1.05 Ω which is relatively lesser than pristine NiCo2N and NG . Likewise, the Rct value of core-shell NiFe2N@NGhybrid is found to be got the high specific capacitance of 1374 F g -1 at 2 A g -1 with 96.1% retention of capacitance after 10000 cycles. The specific capacitance of the Co8FeS8@NG electrode is significantly higher than that of pristine Co8FeS8 (861 F g -1 ), pristine NG (301 F g -1 ), Co9S8@NG (692 F g -1 ), or FeS@NG (420 F g -1 ) at 2 A g -1 in 2 M KOH aqueous solution as the electrolyte and was well supported by the appropriate CV profiles indicating that the area under the CV curve is maximum for Co8FeS8@NG compared to other electrodes shown in Fig. . This observation is justified by the fact that the SBET of core-shell Co8FeS8@NG (398 m 2 g -1 ) is appreciably greater than that of pristine Co8FeS8 (28 m 2 g -1 ), Co9S8@NG (252 m 2 g -1 ), or FeS@NG (312 m 2 g -1 ) and exhibited in g -1 at 1.5 A g -1 as well as 96.4% of the original capacitance value retained after 10000 cycles in 3 M KOH electrolyte solution which is appreciably higher than ZnCo2O4@N-doped reduced graphene oxide having the specific capacitance of 636 F g -1 at 1.5 A g -1 . The significant change in the capacitive performance is attributed to the fact that the pore size of PANI incorporated ZnCo2O4@N-doped reduced graphene oxide (70.886 nm) is comparatively higher than ZnCo2O4@N-doped reduced graphene oxide . Also, the increased conductivity of the PANI incorporated ZnCo2O4@N-doped reduced graphene oxide due to the incorporation of PANI and the strong faradaic behaviour offered by the PANI as well as the transition metal ions was presumed to responsible for the enhanced electrochemical performance. Experienced by the previous report from the same group, they fabricated the PIN (polyindole) incorporated Co3O4@N-doped reduced graphene oxide by treating the appropriate amounts of metal precursors with NGO, FeCl3 and H2O2 via insitu oxidative polymerisation and subjected to 95 NSGFe2O3 is found to be 2.75 at% which is greater than NG (1.69 at.%) implying the efficacious doping of nitrogen atom in Fe2O3. The obtained material has achieved the specific capacitance of 1567 F g -1 at 1 A g -1 along with 91% capacitance retention after 5000 cycles at 5 A g -1 in 6 M KOH solution. The specific capacitance determined from the GCD profile of NG, NFe, Fe2O3 was found to be 344, 780 and 743 F g -1 at 1 A g -1 , respectively. These values are substantially lower compared to the hybrid (NSGFe2O3) which is also strongly supported that the SBET of the NSGFe2O3 (186 m 2 g -1 ) is greater than that of bare N-Fe2O3 (18 m 2 g -1 ) due to the incorporation of NSG (224 m 2 g -1 ) suggesting that the incorporation of heteroatoms in the graphene lattice enhance the pore size and surface area that facilitate the contact between electrode and electrolyte giving rise to the appreciable improvement in the charge storage performance. Interestingly, our group earlier reported the fabrication of Cu nanoparticles anchored B-doped graphene (CuBG) by hydrothermal treatment of appropriate precursors and the subsequent pyrolysis in CVD furnace at four different temperatures (650, 750, 850 and 950 °C) . The CuBG prepared at 950 °C achieved a maximum specific capacitance of 483.3