Figure 4

Electrochemical performance of the VT2 film.

CV curves for (a) the VT2 film, the VT2 powder and the nickel foam at a scan rate of 100 mV s^–1 and (b) the VT2 film at the scan rates of 10, 20, 100, 200, 500 and 1000 mV s⁻¹. (c) Galvanoastatic charge-discharge curves of the VT2 film at current densities of 3, 4, 5, 8, 10, 15 and 20 A g⁻¹. (d) Cycling performance at a current density of 10 A g⁻¹ over 1000 cycles. The inset shows the specific capacitance as a function of scan rate ranging from 10 to 1000 mV s⁻¹.