The gravimetric capacitance of NSMGO and MGO in 6 M KOH solution at 1 A g -1 were found to be 135 and 85 F g -1 , respectively. Although the low porous nature of NSMGO compared to MGO, the low porous and surface area of NSMGO would be the beneficial for the fastest were found to be 3.01 and 1.96 at%, respectively. It was observed that the capacitance enhances with increase in the concentration of polystyrene sulphonate. Among the different concentrations of PSS, the N, S co-doped graphene derived from the concentration of PSS (1 mg mL -1 ) at the electrophoretic voltage of 3.5 V produced the gravimetric capacitance of 354 F g -1 at 0.5 A g -1 in 1M Et4NBF4 acetonitrile electrolyte via three-electrode system. Furthermore, the fabricated flexible device accomplished the greater energy density of 71.5 W h kg -1 and 99.5% of capacitance retained after 10000 charge-discharge cycles. via supercritical fluid method using 3-fluororbenzene boronic acid as the dopant at 400 °C for 1 h with different weight ratios of . Among the three different mass ratios of GO and the precursor, the material in which the dopant and GO are in the ratio 1:2 has shown the maximum specific capacitance of 506 F g -1 at 1 A g -1 in 1 M H2SO4 electrolyte with the substantial stability having capacitance retention of 105% over 10000 cycles. The atomic percentage of both boron and fluorine in the material which shown the highest capacitance was found to be about 1.95 and 1.35, respectively. It also acquired an excellent specific capacitance of 832 F g -1 at 4 A g -1 in NaVO3/H2SO4 due to the pseudocapacitance by the redox additive in aqueous electrolyte.