The supercapacitive performance was investigated using three-electrode system in 1 M H2SO4 solution. The SC-800, SC-900, and SC-1000 electrodes showed the specific capacitance of 135, 143, and 193 Fg -1 , respectively at 0.5 Ag -1 . The Nyquist plot of SC-1000 had the lowest interfacial charge transfer resistance (Rct) of 1.52 Ω than that of SC-900 , and SC-800 , indicating the suitability of SC-1000 as the best material over other electrodes for promoting charge transfer rapidly. Further, a symmetric supercapacitor device was constructed using SC-1000, and delivered the specific capacitance value of 155 F g -1 at 1 A g -1 with a capacitance retention of 93% after 10000 continuous cycles, and the corresponding Nyquist of 1867.4 m 2 g -1 with a pore volume of 0.99 cm 3 g -1 , and 3.6 at % of nitrogen-doped content, with rich micro-, meso-, and interconnected macropores. The electrochemical performance of NHPC was examined by three different activation temperature such as 700, 800, and 900 ˚C.