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Maximizing ion accessibility in MXene-knotted carbon nanotube composite electrodes for high-rate electrochemical energy storage

Author

Listed:
  • Xiang Gao

    (Huazhong University of Science and Technology (HUST))

  • Xuan Du

    (Huazhong University of Science and Technology (HUST))

  • Tyler S. Mathis

    (Drexel University)

  • Mengmeng Zhang

    (Huazhong University of Science and Technology (HUST))

  • Xuehang Wang

    (Drexel University)

  • Jianglan Shui

    (Beihang University)

  • Yury Gogotsi

    (Drexel University)

  • Ming Xu

    (Huazhong University of Science and Technology (HUST))

Abstract

Improving the accessibility of ions in the electrodes of electrochemical energy storage devices is vital for charge storage and rate performance. In particular, the kinetics of ion transport in organic electrolytes is slow, especially at low operating temperatures. Herein, we report a new type of MXene-carbon nanotube (CNT) composite electrode that maximizes ion accessibility resulting in exceptional rate performance at low temperatures. The improved ion transport at low temperatures is made possible by breaking the conventional horizontal alignment of the two-dimensional layers of the MXene Ti3C2 by using specially designed knotted CNTs. The large, knot-like structures in the knotted CNTs prevent the usual restacking of the Ti3C2 flakes and create fast ion transport pathways. The MXene-knotted CNT composite electrodes achieve high capacitance (up to 130 F g−1 (276 F cm−3)) in organic electrolytes with high capacitance retention over a wide scan rate range of 10 mV s−1 to 10 V s−1. This study is also the first report utilizing MXene-based supercapacitors at low temperatures (down to −60 °C).

Suggested Citation

  • Xiang Gao & Xuan Du & Tyler S. Mathis & Mengmeng Zhang & Xuehang Wang & Jianglan Shui & Yury Gogotsi & Ming Xu, 2020. "Maximizing ion accessibility in MXene-knotted carbon nanotube composite electrodes for high-rate electrochemical energy storage," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19992-3
    DOI: 10.1038/s41467-020-19992-3
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    Cited by:

    1. Ke Li & Juan Zhao & Ainur Zhussupbekova & Christopher E. Shuck & Lucia Hughes & Yueyao Dong & Sebastian Barwich & Sebastien Vaesen & Igor V. Shvets & Matthias Möbius & Wolfgang Schmitt & Yury Gogotsi , 2022. "4D printing of MXene hydrogels for high-efficiency pseudocapacitive energy storage," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Dixit, Fuhar & Zimmermann, Karl & Alamoudi, Majed & Abkar, Leili & Barbeau, Benoit & Mohseni, Madjid & Kandasubramanian, Balasubramanian & Smith, Kevin, 2022. "Application of MXenes for air purification, gas separation and storage: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 164(C).
    3. Tao Wang & Runtong Pan & Murillo L. Martins & Jinlei Cui & Zhennan Huang & Bishnu P. Thapaliya & Chi-Linh Do-Thanh & Musen Zhou & Juntian Fan & Zhenzhen Yang & Miaofang Chi & Takeshi Kobayashi & Jianz, 2023. "Machine-learning-assisted material discovery of oxygen-rich highly porous carbon active materials for aqueous supercapacitors," Nature Communications, Nature, vol. 14(1), pages 1-13, December.

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