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TiO2 crystalline structure and electrochemical performance in two-ply yarn CNT/TiO2 asymmetric supercapacitors

  • Energy materials
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Abstract

Solid-state flexible energy storage devices play a crucial role in the development of wearable electronic textiles. In this study, we fabricated flexible asymmetric two-ply yarn supercapacitors from carbon nanotube yarns and surface-oxidized titanium filament. The crystalline structure of the TiO2 surface layer can be adjusted to amorphous, anatase and rutile states by altering the annealing temperature. The titanium filament with a rutile TiO2 surface layer produced at high annealing temperature showed far superior electrochemical performance over the filaments with amorphous and anatase TiO2 surface layers. The as-prepared asymmetric two-ply yarn supercapacitors in aqueous gel electrolyte can achieve a durable operating voltage up to 1.4 V, with a maximum energy density of 11.7 Wh kg−1 and a maximum power density of 2060 W kg−1. The asymmetric two-ply yarn supercapacitors exhibited excellent flexibility and cycling stability over 1200 cycles at straight, twisted and bent states.

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Acknowledgement

We gratefully acknowledge the financial support of Hubei Province Natural Science Fund for Distinguished Young Scientists (2014CFA037) and the National Natural Science Foundation of China (21403305).

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Authors and Affiliations

  1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Materials Science, South-Central University for Nationalities, 430074, Wuhan, People’s Republic of China

    Ting Li, Yunlong Wu, Qiufan Wang, Daohong Zhang & Aiqing Zhang

  2. CSIRO Manufacturing, P.O. Box 21, Belmont, VIC, 3216, Australia

    Menghe Miao

Authors
  1. Ting Li
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  2. Yunlong Wu
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  3. Qiufan Wang
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  4. Daohong Zhang
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  5. Aiqing Zhang
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  6. Menghe Miao
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Correspondence to Daohong Zhang or Menghe Miao.

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Li, T., Wu, Y., Wang, Q. et al. TiO2 crystalline structure and electrochemical performance in two-ply yarn CNT/TiO2 asymmetric supercapacitors. J Mater Sci 52, 7733–7743 (2017). https://doi.org/10.1007/s10853-017-1033-6

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  • DOI: https://doi.org/10.1007/s10853-017-1033-6

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