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Fig. 1
XRD patterns of NiO nanofibers sintered at different temperatures.
Fig. 2
SEM images of precursor nanofibers.
Fig. 3
SEM images of NiO nanofibers sintered at different temperatures: 400 °C (a, b), 500 °C (c, d) and 600 °C (e, f). EDS mappings of Ni (g) and O (h) of the sample calcined at 500 °C.
Fig. 4
Charge-discharge curves of samples at different temperatures (current density: 50 mA·g−1).
Fig. 5
Cycling performance of samples at different temperatures.
Fig. 6
C-V curves of samples calcined at 500 °C (scan rate: 0.05 mV·s−1).