Wh kg -1 at 0.1 A g -1 , and corresponding Nyquist plot showed Rs value of 9.5 Ω. While compared to aqueous electrolyte, higher Rs value has been observed in organic electrolyte, which indicates the poor compatibility between active materials and organic electrolyte, thereby prevented the electrolyte from adequate accessibility of the external surface and inner volume of carbon materials. Moreover, the power density, and the energy density of the HMC-800 electrode were determined as 2243 W kg -1 , and 29 Wh kg -1 , respectively, at a current drain time of 45 s. The obtained results of the work clearly indicated the efficiency of doped carbon materials towards reaching high capacitance in aqueous solution, however the contribution of the chosen organic electrolyte needs to be improved. Marta Sevilla et al. reported the surface coating of carbon nanotubes with a layer of N-doped carbon through an environmentally friendly hydrothermal carbonization process, using glucosamine as the precursor for nitrogen . It is reported that, the N content of the N-doped carbon/CNT (N-CNT) composite could be tuned between 1.8-2.5