fig4

Figure 4. (A) CV curves, (B) GCD profiles and (C) Nyquist plots in the frequency range from 100 kHz to 0.01 Hz of Ni₃N-Co₂N_0.67/NC, N₀C₃-TEOA, N₁C₂-TEOA, N₁C₁-TEOA, N₂C₁-TEOA, N₃C₀-TEOA. (D) CV curves at different scan rates and (E) GCD profiles at different current densities of Ni₃N-Co₂N_0.67/NC. (F) Specific capacitance of Ni₃N-Co₂N_0.67/NC calculated from GCD profiles at different current densities. (G) The cycle performance curve of Ni₃N-Co₂N_0.67/NC at 10 A g^-1. (H) b values simulated from anodic and cathodic peak current and scan rate of Ni₃N-Co₂N_0.67/NC. (I) Contribution ratio between capacitance and the diffusion-controlled process under various scan rates.