Figure 7

(a) CV curves of RGO and RGO-7–10 at a scan rate of 100 mV s⁻¹. (b and c) GCD curves of RGO and RGO-7–10 at current densities of 5 and 50 A g⁻¹, respectively. (d) The specific capacitance as a function of current density for RGO and RGO-7–10. (e) Nyquist plots of RGO and RGO-7–10. Inset shows the close-up view of the high-frequency regime. (f) Cycling stability of RGO and RGO-7–10 at different current densities of 10 A g⁻¹, 20 A g⁻¹, 30 A g⁻¹ and 40 A g⁻¹, respectively. The running cycle at each current density is the same as 5 000 cycles.