SCIENCE CHINA Materials, Volume 63 , Issue 7 : 1171-1181(2020) https://doi.org/10.1007/s40843-020-1278-9

Nb2O5 nanotubes on carbon cloth for high performance sodium-ion capacitors

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  • ReceivedJan 17, 2020
  • AcceptedFeb 24, 2020
  • PublishedApr 7, 2020


Funded by

the National Natural Science Foundation of China(51672308,51972025,61888102)


This work was supported by the National Natural Science Foundation of China (51672308, 51972025 and 61888102).

Interest statement

The authors declare no conflict of interest.

Contributions statement

The paper was written through contributions of all authors. All authors have given approval to the final version of the paper.

Author information

Rui Jia received her BE degree in 2015 from Huaqiao University and ME degree in 2018 from Qingdao University. She is a PhD candidate at the College of Mathematics and Physics, University of Science and Technology Beijing, China. Her research interests mainly focus on sodium-ion batteries and hybrid supercapacitors.

Guozhen Shen received his BSc degree (1999) in chemistry from Anhui Normal University and PhD degree (2003) in chemistry from the University of Science and technology of China. He joined the Institute of Semiconductors, Chinese Academy of Sciences as a Professor in 2013. His current research focuses on the flexible electronics and printable electronics, including transistors, photodetectors, sensors and flexible energy storage and conversion devices.

Di Chen received her BSc degree (1999) in chemistry from Anhui Normal University and PhD degree (2005) in chemistry from the University of Science and technology of China. She joined the University of Science and Technology Beijing as a Professor in 2014. Her current research focuses on the energy storage materials and devices.


Supplementary information

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


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  • Figure 1

    Schematic illustration of the growth of Nb2O5-based products on carbon cloth.

  • Figure 2

    SEM, TEM and HRTEM images of the Nb2O5-based products at different pH values: (a–d) pH 4.8–5.2, (e–h) pH 4.5–4.7 and (i–l) pH 4.0–4.4.

  • Figure 3

    (a) XPS spectrum survey of the Nb2O5 nanotubes. (b, c) High resolution XPS spectra of Nb 3d and O 1s of Nb2O5 nanotubes. (d–g) SEM image and the corresponding element mappings of Nb2O5@CC nanotubes.

  • Figure 4

    (a) XRD patterns, (b) SAXS and (c) pore size distributions of the Nb-based products with various nanostructures.

  • Figure 5

    Electrochemical performances of the Nb-based products in Na-ion half cells: (a) CV curves of the Nb2O5@CC products with different nanostructures at the scan rate of 1 mV s−1. (b) CV curves of the Nb2O5@CC nanotubes for the first three cycles at the scan rate of 1 mV s−1. (c, d) CV curves and specific peak current of the Nb2O5@CC nanotubes at different scan rates from 1 to 5 mV s−1. (e) CV curve of the Nb2O5@CC nanotubes with the shaded area of surface capacitive contribution at 5 mV s−1. (f) GCD profiles of the Nb2O5@CC nanotubes at 1 A g−1. (g) Rate capability of the Nb2O5@CC nanotubes at various current densities. (h) Long-term cycling stability of the Nb2O5@CC nanotubes at 1 A g−1.

  • Figure 6

    Electrochemical performance of the SICs using Nb2O5@CC nanotubes as anode and AC as cathode: (a) GCD curves of the SICs at different current densities from 0.03 to 0.3 A g−1. (b) Specific capacitance as a function of various current densities. (c) The rate performance tested by progressively changing the current densities. (d) The high-frequency region of the Nyquist impedance plot. The inset shows the Nyquist impedance plot of the SICs. (e) The long cycling stability of the SICs. The inset displays a photograph of an LED lighted by a coin SIC device. (f) Energy and power densities of the fabricated SICs.

  • Figure 7

    The properties of flexible SIC devices based on the tubular Nb2O5@CC//AC electrodes. (a) Schematic diagram of the device. (b) Photographs of the flexible device powering LED under different bending angles. (c) Cycling properties of the bendable SICs at different bending conditions. (d) Long-term cycling performance of the device without bending.


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