Fig. 6From: Facile Synthesis of Nitrogen-Doped Microporous Carbon Spheres for High Performance Symmetric SupercapacitorsThe electrochemical characteristics of the assembled SSDs based on the NMCSs-600 materials using PVA/KOH as the gel electrolyte in two electrode system. a CV curves of the SSD in different voltage windows from 1 to 1.6 V at the scan rate of 20 mV s− 1. b CV curves of the SSD at various scan rates within a voltage window of 1.6 V. c GCD curves at different current densities. d The gravimetric capacitance of the SSD as a function of current density, the inset image shows a commercial red LED powered by two SSDs in series. e Nyquist plot of the SSD, the inset gives the magnify plot for high frequency range. f Ragone plots of the SSD and the other carbon spheres based symmetric supercapacitorsBack to article page