Figure 5: Mass loading and cycling stability.

(a) Comparison of the volumetric capacitance of the CM-NF electrodes at different mass loading tested in a 6 M KOH solution at a current density of 0.1 A g−1 and (b) stability evaluation of the CM-NF electrodes in a 6 M KOH solution at a charge current of 5 A g−1 for 20,000 cycles; (c) Electrochemical impedance spectra (inset: magnified 0–4 Ω region) under the influence of an ac voltage of 5 mV.