W h Kg -1 at a specific power 125 W Kg -1 . Moreover, the influence of electrolyte type was investigated by fabricating the same symmetrical supercapacitor with YPC-4 electrode in 1 M Na2SO4 electrolyte, and observed the lower specific capacitance values than that of KOH electrolyte due to the size effect of electrolyte ions. However, the 1 M Na2SO4 electrode presented a high specific energy of 34.6 W h Kg -1 at the specific power density of 200. The SBET of NPAC-600, NPAC-700, and NPAC-800 were determined as 400, 1364±18, and 1063 m 2 g -1 , respectively. NPAC-700 showed the maximum SBET, which was decreased with increasing temperature to 800 ˚C, due to the partial collapse and shrinkage in pores at high temperature. The XPS analysis showed the presence of N, and O heteroatoms in NPACs samples, in which the content of N were decreased with increasing temperature. NPAC-600, NPAC-700, and NPAC-800 showed the contents of N/ O with 11.7/15.8%, 7.5/8.6, and 1.6/23.7%, respectively. The supercapacitor performance of NPACs were studied in both threeelectrode, and two-electrode systems using 1.0 M H2SO4 electrolyte solution, which confirmed that the NPAC-700 electrode showed the highest specific capacitance of 251±7 F g -1 , versus NPAC-600 (233±7 F g -1 ), and NPAC-800 (193±4 F g -1 ) at 1 A g -1 . The NPAC-700 electrode showed the capacity retention of 91% after 10000 cycles at a higher current density of 10 A g - 1 . In two electrode system using 1.0 M H2SO4, the NPAC-700 showed the maximum specific capacitance of 200±2 F g -1 at 0.5 A g -1 , and produced the energy density of 6.95 W h Kg -1 at 0.5 A g -1 , and a high-power density of 9972 W Kg -1 at 20 A g -1 . Further, a pouch type