A discharge capacity of 231 mAh g -1 was obtained for B-doped graphene at 1 A g -1 which is higher compared to RGO (139 mAh g -1 ) and the enhanced performance compared to pristine graphene could be attributed to various factors such as high surface area, high electrical conductivity. The arc-discharge method is important technique to generate reactive heteroatom radicals for the doping of heteroatom over graphene. The Arc discharge technique was first introduced by . and e, it is more evident that the graphite is having flakelike structure but it is disappeared in the milled graphite. precursor and optimized the synthesis by fine tuning the weight ratios of urea and GO and hydrothermal reaction temperature . For instance, if the reaction temperature raised from 160 to 180 °C then the nitrogen content and the percentage of various nitrogen such as pyridinic, pyrrolic and quaternary nitrogens also enhanced. Further if the hydrothermal temperature was reached upto 190 °C then the content of nitrogen and that of quaternary nitrogen were minimised. The N-doped graphene was prepared using hydrothermal with hexamethylene tetramine as the dopant in another report and inferred from XPS analyses that the content of both pyridinic and quaternary nitrogen enhances but pyrrolic nitrogen reduces with increase of duration in hydrothermal reaction . It has been suggested that on prolonged duration in hydrothermal processing, quaternary nitrogen is generated as a result of interaction between olefinic carbon with adjacent nitrogen atoms. Additionally, the winkled sheet-like morphology is obtained under hydrothermal processing and shown in Fig. . the N-doped graphene by hydrothermal method using ammonium bicarbonate as the dopant and investigated for supercapacitor applications . The synthesis of N-doped graphene was performed under three different hydrothermal reaction durations and inferred that the content of overall nitrogen and graphitic nitrogen enhances with rise in reaction duration. the N-doped graphene by hydrothermal method using hydroxylamine as the reductant for supercapacitor application . They proposed from the XPS investigations that the content of quaternary nitrogen decreases while the content of both pyridinic and pyrrolic nitrogen enhances with increase of hydrothermal duration. Hence it has been clearly understood that not only the reaction duration but also the nature of precursor played a significant impact on the existence of different types of doped In