Figure 7

Representative cyclic voltammograms and charge–discharge performances of the hematite electrode. (a) Representative cyclic voltammograms of the hematite nanoparticles (presented in Figure 1b) at a scan rate of 0.1 mV s⁻¹; (b) the charge–discharge performances at various current rates (1 C = 1,006 mA g⁻¹, corresponding to the full discharge in 1 h, a rate of n C corresponds to the full discharge in 1/n h) of the hematite nanoparticles; (c) the rate performance and (d) the cycling performance at a current of 1 C of an electrode fabricated with the hematite nanoparticles presented in Figure 1b; (e) the rate performance and (f) the cycling performance at a current of 1 C of an electrode fabricated with hierarchical mesoporous pod-like hematite nanoarchitectures presented in Figure 2e.