Figure 3. Electrochemical Na⁺ storage performance of SnS electrodes.

(a) Galvanostatic charge/discharge profiles during the first 10 cycles of the nanohoneycomb electrode. (b) CV curves of the first three cycles of the SnS nanohoneycomb electrode at a scan rate of 0.2 mV s⁻¹. (c) Galvanostatic charge/discharge profiles of SnS electrodes after five cycles activation. (d) Long-term cycling performances of SnS electrodes and the pure graphene foam electrode at a current density of 100 mA g⁻¹. (e) Rate performances of SnS electrodes at various current densities from 30 to 30,000 mA g⁻¹. (f) Fast charging (charge at 30 A g⁻¹ in 1 min, discharge at 30 mA g⁻¹ and 1 A g⁻¹ with ∼13 h and 30 min, respectively) properties of the nanohoneycomb electrode.