Figure 4. Electrochemical performances.

(a) Initial three cycles of CV curves for the self-standing MoS₂-CNFs electrode at a scan rate of 0.2 mV s⁻¹; (b) Galvanostatic discharge/charge profiles of the MoS₂-CNFs electrode at a current density of 100 mA g⁻¹ within the potential range 0.01–3.0 V vs. Na⁺/Na; (c) Cycling performance and corresponding coulombic efficiency of the MoS₂-CNFs electrode at 100 mA g⁻¹; (d) Rate capacity of the MoS₂-CNFs at different current densities in the potential range of 0.01–3.0 V.