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Electrospun MoO2@NC nanofibers with excellentLi+/Na+ storage for dual applications

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  • ReceivedJul 27, 2017
  • AcceptedSep 12, 2017
  • PublishedOct 26, 2017

Abstract

MoO2@N-doped C nanofibers (MoO2@NC NFs) were synthesized by electrospinning with polyacrylonitrile as carbon source. The in situ formed MoO2 nanocrystals are completely embedded in the carbon nanofibers, which can not only accelerate ion transition, but also act as a buffer to avoid the mechanical degradation of active material due to the volume changes during charge/discharge cycling. When used as the anode material for both Li/Na-ion batteries, the as-synthesized MoO2@NC NFs displayed excellent Li+/Na+ storage properties. As the anode for Li-ion battery, the MoO2@NC NFs display a high discharge capacity of 930 mA h g−1 at a current density of 200 mA g−1 for 100 cycles, and 720 mA h g−1 at a current density of 1 A g−1 for 600 cycles. Moreover, the discharge capacity of 350 mA h g−1 could be realized at a current density of 100 mA g−1 for 200 cycles for Na-ion battery.


Funded by

the National Natural Science Foundation of China(51302079)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (51302079).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Liang J and Ma J designed the project. Liang J performed the main experiments. Gao X and Chen C put forward valuable suggestions. Guo J is responsible for the characterization of materials. Gao X and Fan K helped with the experiments. Liang J and Ma J analyzed the data and wrote the manuscript.


Author information

Jiaojiao Liang is a PhD candidate in the School of Physics and Electronics, Hunan University. Her current research focuses on the synthesis of nanomaterials and their applications in lithium-ion and sodium-ion batteries.


Xian Gao is an undergraduate student at Hunan University. His current research is focused on the synthesis of nanomaterials and the preparation of devices.


Jianmin Ma is an associate professor in Hunan University, China. He received his BSc degree in chemistry from Shanxi Normal University in 2003 and PhD degree in materials physics and chemistry from Nankai University in 2011. During 2011–2015, he conducted the research in several oversea universities as a postdoctoral research associate. His research interest focuses on the synthesis of nanostructured materials, electrochemical storage devices, electrocatalysis, and gas sensors.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


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  • Figure 1

    (a) SEM image, (b) TEM image, (c and d) HRTEM images of the MoO2@NC NFs.

  • Figure 2

    (a) XRD patterns of MoO2@NC NFs, NC NFs; and (b) TGA curve of the MoO2@NC NFs.

  • Figure 3

    XPS spectra of the MoO2@NC NFs: (a) Mo 3d; (b) C 1s; (c) N 1s; (d) O 1s.

  • Figure 4

    Electrochemical performance for LIBs: (a) CV curves at 0.1 mV s−1; (b) galvanostatic charge/discharge voltage profiles at 200 mA g−1 of MoO2@NC NFs; (c) cycling performances of NC NFs and MoO2@NC NFs at 200 mA g−1; (d) rate capabilities of MoO2@NC NFs; and (e) cycling performances of MoO2@NC NFs at 1 A g−1.

  • Figure 5

    Electrochemical performance for SIBs: (a) CV curves at 0.1 mV s−1 and (b) galvanostatic charge-discharge voltage profiles of MoO2@NC NFs at 100 mA g−1; (c) cycling performances of NC NFs and MoO2@NC NFs at 100 mA g−1; (d) rate capabilities of MoO2@NC NFs.

  • Table 1   Comparison of lithium-storage performance of different MoO/carbon composites

    Materials

    Current density (mA g−1)

    Cycle number

    Discharge capacity (mA h g−1)

    Ref.

    MoO2/NC NFs

    200/1000

    200/600

    930/720

    This work

    MoO2-C hollow spheres

    200

    50

    763

    [8]

    N-doped carbon/MoO2

    100

    100

    1141.8

    [28]

    MoO2/N-doped CFs

    500

    500

    840

    [44]

    Porous MoO2@C

    100/1000

    50/850

    1442/443.8

    [43]

    Graphite oxide-MoO2 

    200/1000

    80/100

    754/584

    [26]

    MoO2/carbon hollow spheres

    500

    200

    580

    [45]

    Graphene oxide/MoO2

    1000

    100

    431

    [46]

    MoO2@C

    500

    140

    861

    [47]

    Carbon-coated MoO2

    80

    60

    1113.3

    [12]

    MoO2/N-doped graphene

    100

    60

    785

    [48]

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