The decrement in the SBET value at 900 ˚C was reported to be due to the collapse of pores and enhanced orientation during the carbonization process. The XPS studies of HMC-700, HMC-800, and HMC-900 showed the presence of N/O/S content with 5.12/7. , respectively. The at% of heteroatoms contents in HMCs were decreased with increasing temperature. The performance of HMC supercapacitor electrodes were studied in 6 M KOH aqueous electrolyte, and at a current density of 0.5 A g -1 , HMC-800 electrode showed the highest specific capacitance of 445 F g -1 , while compared to HMC-700 (382 F g -1 ), and HMC-900 (362 F g -1 ), respectively. The Nyquist plots of HMC-700, HMC-800, and HMC-900 exhibited the equivalent series resistance values of 1.1, 0.02, and 0.90 Ω respectively.