fig3
Figure 3. (A) CV curves, (B) CV curves of HC-1 at different rates; (C) linear fitting curves of the CV curves; (D) the initial galvanostatic charge-discharge profiles of the three samples at a current density of 37.2 mA g-1; (E) Nyquist Impedance plots, (F) Rate performance and (G) cycling stability (current density = 0.186 A g-1). CV: Cyclic voltammetry; HC: hard carbon.
