fig4

Figure 4. Electrochemical characteristics on C-0, C-1, C-2, and C-3 electrodes in a three-electrode system: (A) CV curves at a scan rate of 100 mV·s^-1; (B) GCD curves at a current density of 1 mA·cm^-2; (C) Specific capacitance at different scan rates; (D) Linear fitting curves for diffusion coefficient; (E) Nyquist plots and equivalent circuit fitting; Electrochemical characteristics of C-3 electrode: (F) Coulombic efficiency and cycling performance; (G) CV curves at various scan rates; (H) GCD curves at different current densities; (I) Capacitive and diffusion-controlled contributions to charge storage at 10 mV·s^-1 from CV curves; (J) Histogram showing the percentage contribution at different scan rates. CV: Cyclic voltammetry; GCD: galvanostatic charge-discharge.