Fig. 4. Electrochemical performance of the electrode. GCD profiles of the (a) Pure Bi and (b) Bi/CF at 0.1 A g⁻¹. (c) Rate performance. (d) EIS diagram (the inset shows corresponding equivalent circuit). (e) CV profiles at the scan rate of 0.1 mV s⁻¹. (f) Long-term cycles of Bi/CF at current density of 1.0 A g⁻¹.