Both high surface area and pseudocapacitive nature by the both the heteroatoms such as (boron and nitrogen) are presumed to accountable for the upgradation in capacitance. From Fig. , the symmetric flexible supercapacitor acquired a high electrochemical stability with 93.5 % of capacitance retention over 10,000 charge/discharge cycles in PVA-KOH gel electrolyte and attained the energy density of 5.03 Wh Kg -1 . Recently, Duraisamy Prakash et al. fabricated the B, N co-doped graphene by hydrothermal using ammonia and boric acid as the precursors at . The contents of boron and nitrogen from the XPS of the synthesized material are analyzed to be 4.41 and 4.61 at. %, respectively. The obtained material has got the specific capacitance of 885 F g -1 at 1 A g -1 in 6 M KOH solution with good rate capability 59% retention at 10A g -1 . Because of various redox active sites such as B-C, B-N, N-O and B-O, the pseudocapacitive behaviour is strongly observed in the B, N co-doped graphene. The electrochemical stability results suggesting that it has gained the 77% retention in capacitance over 10 4 cycles. Moreover, the asymmetric supercapacitor device (NBGO//RGO) studies suggesting that it exhibits high gravimetric specific capacitance of 57.88 F g -1 at 1 A g -1 , energy and power density of 23.23 Wh kg -1 and 872 W kg -1 as well as extraordinary electrochemical stability (125% retention after 10,000 cycles).