Wh kg -1 and power density of 1600 W Kg -1 which is significantly higher than N and B-doped graphene. The excellent capacitance behaviour is arisen as a consequence of the aerogels containing well-interconnected sheets of graphene could provide high surface area, 3D macroporosity and increased electrical conductivity which are essential for ion transport in flexible supercapacitor device. In another report, Dou et al. prepared the B, N co-doped graphene by thermal annealing of melamine diborate and GO with different temperatures (600 -1000 °C) for 2 h under Ar atmosphere . Among the different temperatures, the material obtained at 700 °C has achieved the specific capacitance of 130.7 F g -1 at 0.2 A g -1 in 1 M H2SO4 as electrolyte which is relatively higher than N-doped graphene (111. 3 F g -1 ) and Bdoped graphene (82.9 F g -1 ). This is because of the fact that the contents of both boron and nitrogen diminish with increase of annealing temperature and the capacitive performance also reduces. The B, N co-doped graphene obtained at 700 °C has got the amount of both boron and nitrogen are 3.95 and 19.73 at. %, respectively. Hence the high doping level is found to be Wh kg -1 with a power density of 2031.5 W kg -1 at 60 °C in EMIMBF4 electrolyte having the operating voltage of 4 V, respectively. Because of the doping effect by the double heteroatoms, not only the generation of active sites but also the wettability with ionic liquid electrolyte enhances that facilitates the pseudocapacitance behaviour. Besides, the rate of ion transport is enhanced due to the existence of porous microstructure by the doping of graphene nanosheets with double heteroatoms. Tao Zhu et al. prepared the B, N co-doped graphene (BNG) by subjecting the mixture of GO with boric acid and ammonium bicarbonate in dielectric barrier discharge plasma reactor with AC input power of 80 V and 1.6 A along with H2 as the working gas . Thus, the obtained B, N co-doped graphene submitted the gravimetric capacitance of 350 F g -1 at 0.5 A g -1 in 6 M KOH aqueous solution which is higher than B-doped graphene (BG; 240 F g -1 ) and N-doped graphene (NG; 288 F g -1 ). The possible reason might be the order of SBET (m 2 g -1 ) is BNG (269.48) > NG (218.69) > BG . The content of boron and nitrogen in BNG from XPS found to be about 1.41 and 2.69 at. %, respectively. The feasible reason suggested is that if the boron atoms are incorporated in graphene, then enrich the electron-deficient holes close to the carbon atoms, permitting it convenient for carbon atoms to further combine with electron-releasing nitrogen atoms. Furthermore, such effect is predominantly distributed within the conjugated area. In another study, the 3D macroporous B, N co-doped graphene aerogels from polyaspartamide and benzene-1,4diboronic acid by hydrothermal at 120 °C for 12 h and susbsequent thermal annealing at 900 °C for 3 h and XPS analysis revealed the contents of boron and nitrogen are 3.5 and 3.8 at. %, respectively . Hence the obtained B, N co-doped graphene aerogels has got the specific capacitance of 283.8 F g -1 at 1 A g -1 in 2 M KOH aqueous solution which is relatively higher than N-doped RGO (175 F g -1 ) and B-doped RGO (150 F g -1 ). Besides, the order of SBET is B, N co-doped RGO (162.3 m 2 g -1 ) > B-doped RGO (117.6 m 2 g -1 )>N-doped RGO (103.6 m 2 g -1 ).