prepared by thermal annealing with different ranges of temperatures from 600 to 900 °C under nitrogen atmosphere for 90 minutes with urea as the dopant and the reduced graphene oxide obtained by two different reducing agents such as sodium borohydride and hydrazine hydrate . The N-doped graphene obtained from RGO derived by sodium borohydride at 600 °C has achieved the specific capacitance of 249 F g -1 at 1 A g -1 in EMIMBF4 by two-electrode system which is highest among the other samples. Also, it revealed the specific capacitance of 126 F g -1 at 10 mV s -1 in 6 M KOH aqueous solution. It has the highest N-doping content of 8.5 wt% and the SBET of 600 m 2 g -1 . Therefore, it has been understood that the if the temperatures increases then the content of nitrogen as well as the surface area decreases which might be attributed to the fact that the nitrogen containing functional groups are severely reduced at higher temperature. As a result, the specific capacitance also decreases. Zheng et al.