The S, P co-doped graphene aerogel (SP-AG) was synthesized from phytic acid and thioglycolic acid by thermal annealing at 900 °C under inert atmosphere for 2 h [645]. The prepared material has got the specific capacitance of 438 F g -1 at 10 mV s -1 in 1 M H2SO4 electrolyte and also demonstrated the significant electrochemical stability with capacitance retention of 93.4 % over 10000 cycles at 1 A g -1 . The atomic percentage of sulphur and phosphorus in SP-AG was evaluated from XPS as 5.8% and 4.6%, respectively. Besides, the SP-AG based symmetric supercapacitor delivered an excellent energy density of 88.5 Wh kg - 1 in ionic liquid electrolyte with the working voltage of 3.5 V. The increased behaviour is because of synergistic effect of S and P co-doping and 3 D architecture. the N, S co-doped graphene hydrogel using thiocarbohydrazide under reflux in oil bath at 95 °C for . Because of their porous nature, the optimized ratio of N, S co-doped graphene hydrogel achieved an enhanced specific capacitance of 141 F g -1 in KOH electrolyte at 0.3 A g -1 and delivered an excellent retention of capacitance of 90% over 4000 cycles. The composition of both nitrogen and sulphur present in the optimized material are estimated to be 6.61 and 6.07 at. %, respectively. Due to the pseudocapacitance contribution from nitrogen and sulfur, the prepared N, S co-doped graphene has produced the enhanced specific capacitance.