Figure 3.

Electrochemical performance of the prepared samples. (a) CV curves at 100 mV s⁻¹ in 6 M KOH and (b) CV curve for 4NG at different scan rates (inset shows the current densities are linearly grown with increasing scan rate), (c) Galvanostatic charge discharge curves at 1 A g⁻¹ in 6 M KOH and (d) for 4NG at different scan rates(inset shows the effect of increasing the current density on the specific capacitance).