Fig. 5. FE-SEM images of the nanofibers from the solution without PS nanobeads: (a) as-spun nanofibers and (b) nanofibers obtained after heat-treatment at 350 ℃.
Fig. 6. Electrochemical properties of the hierarchical ZnCo2O4 hollow nanofibers and ZnCo2O4 nanoparticles: (a,b) Differential capacity versus voltage (dQ/dV vs. V) curves at a current density of 0.2 A g-1, (c,d) Charge-discharge curves at a current density of 1.0 A g-1, (e) Cycling performances, (f) Coulombic efficiencies, and (g) Rate performances.
Fig. 1. (a-c) FE-SEM images and (d) XRD pattern of the as-spun nanofibers.
Fig. 2. (a-c) FE-SEM images and (d) XRD pattern of the hierarchical ZnCo2O4 hollow nanofibers obtained after heat-treatment at 350 ℃.
Fig. 3. (a) FE-SEM image and (b) XRD pattern of the ZnCo2O4 nanoparticles obtained after heat-treatment at 600 ℃.
Fig. 4. (a) Thermogravimetric analysis of as-stabilized nanofiber, (b) Thermogravimetric analysis of the hierarchical ZnCo2O4 hollow nanofibers, and (c) N2 adsorption and desorption isotherms of the hierarchical ZnCo2O4 hollow nanofibers and ZnCo2O4 nanoparticles.
Fig. 7. (a) Low magnification and (b) high-magnification FE-SEM images of the hierarchical ZnCo2O4 hollow nanofibers after 100th cycle at a current density of 1.0 A g-1.
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