Therefore, it is more apparent that not only the doped boron atoms but also other features such solution by three-electrode system are in the order -boron trioxide (266 F g -1 ) > boric acid ( F g -1 ) > boron powder (216 F g -1 ). Owing to the existence of B2O3 in relatively higher intensity from the XPS deconvoluted B 1s spectra compared to other BCO2/BC2O and BC3, the specific capacitance of B-doped graphene obtained from boron trioxide is highest among the three different sources of boron. The existence of boron and oxygen functionalities are found to be accountable for the augmented capacitance behaviour via pseudocapacitance. Thus, the boron trioxide derived B-doped graphene and RGO were assembled as a asymmetric solid-state supercapacitor (ASSC) device and displayed the specific capacitance of 122 F g -1 with an energy density of 67.8 Wh Kg -1 . It was demonstrated that the red LED has glown for about 15 minutes upon charging the two asymmetric devices in series at 10 A g -1 as well as DC motor run about 30 seconds after recharging the device and displayed in Fig. . Also, a good stability of 94% capacitance retention with 99% of coulombic efficiency even after 5000 cycles was achieved as displayed in Fig. . The supercapacitive performance of B-doped graphene reported in the literatures is summarized in Table . . P-doped graphene was prepared by the activation of exfoliated graphene with H3PO4. The P-doped exfoliated graphene was fabricated as a symmetric supercapacitor and delivered the specific capacitance of 367 F g -1 and 431 F g -1 at 5 mV s -1 and 10 mA cm -2 in 1M H2SO4 aqueous solution as shown, respectively. The permissible operating voltage range for the exfoliated P-doped graphene determined from CV profile is about 1.7 V and shown in Fig. . The same also delivered an high energy density of 59 Wh kg -1 . The enhanced performance is accounted to the fact the conducting network of the graphene is more pronounced to the greater extent not only by the reduction but also by the P-doping using activation with H3PO4. Wen et al. studied the electrochemical capacitance of P-doped graphene and its wide operating window in aqueous electrolytes for the first time . The Phosphorus doped graphene was synthesized by the activation of GO with H3PO4.