J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (1): 100-108.DOI: 10.1016/j.jmst.2018.09.019
• Orginal Article • Previous Articles Next Articles
Haifeng Xuab*(), Guang Zhuab, Baoming Haoa
Received:
2018-03-18
Revised:
2018-04-21
Accepted:
2018-06-12
Online:
2019-01-04
Published:
2019-01-15
Contact:
Xu Haifeng
Haifeng Xu, Guang Zhu, Baoming Hao. Metal-organic frameworks derived flower-like Co3O4/nitrogen doped graphite carbon hybrid for high-performance sodium-ion batteries[J]. J. Mater. Sci. Technol., 2019, 35(1): 100-108.
Fig. 2. Schematic illustration of fabrication process of flower-like Co3O4/NC hybrid: (a) cobalt-based MOFs were synthesized through a facile solvothermal method; (b) Co3O4/NC hybrid was obtained after calcination.
Fig. 5. XPS spectra of Co3O4/NC and Co3O4 (a), high-resolution XPS spectra of Co3O4/NC for Co 2p (b), O 1s (c) and N 1s (d) (Sat.: photoelectron satellite line).
Fig. 6. CV curves measured at 0.2?mV?s-1 in a voltage range of 0.005-3.0?V (a, c) and discharge/charge profiles at 0.1?A?g-1 (b, d) for Co3O4/NC (a, b) and Co3O4 (c, d).
Fig. 7. Sodium storage performances of as-synthesized Co3O4/NC and Co3O4: (a) cycling performance at 0.1?A?g-1; (b) rate performance; (c) Nyquist plots of Co3O4/NC and Co3O4 after 100 cycles at 0.1?A?g-1 and related equivalent circuit model; (d) fitted straight lines of Z’ vs. ω-1/2 at low frequency of Co3O4/NC and Co3O4; (e) long-term cycling performance of Co3O4/NC at a current density of 0.5?A?g-1 (Rct: charge transfer resistance; Ri: resistance of sodium battery; Rf: resistance of electrode material and the electrolyte; Zw: Warburg impedance; Zre: real part; Zim: imaginary part; ω: phase angle).
Fig. 8. (a) CV curves of Co3O4/NC for SIBs at scan rates varying from 0.2 to 1.0?mV?s-1, (b) logi vs. logv plots, (c) v1/2 vs. i/v1/2 plot and (d) contribution ratio of capacitive and diffusion-controlled capacities at various scan rates (v: scan rate; b: linearly dependent coefficient).
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