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Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

Author

Listed:
  • Xianfen Wang

    (School of Engineering, The University of Tokyo)

  • Satoshi Kajiyama

    (School of Engineering, The University of Tokyo)

  • Hiroki Iinuma

    (School of Engineering, The University of Tokyo)

  • Eiji Hosono

    (National Institute of Advanced Industrial Science and Technology)

  • Shinji Oro

    (Graduate School of Engineering, Nagasaki University)

  • Isamu Moriguchi

    (Graduate School of Engineering, Nagasaki University)

  • Masashi Okubo

    (School of Engineering, The University of Tokyo
    Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University)

  • Atsuo Yamada

    (School of Engineering, The University of Tokyo
    Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University)

Abstract

High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)3 positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4 V and delivers 90 and 40 mAh g−1 at 1.0 and 5.0 A g−1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.

Suggested Citation

  • Xianfen Wang & Satoshi Kajiyama & Hiroki Iinuma & Eiji Hosono & Shinji Oro & Isamu Moriguchi & Masashi Okubo & Atsuo Yamada, 2015. "Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors," Nature Communications, Nature, vol. 6(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7544
    DOI: 10.1038/ncomms7544
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    Cited by:

    1. Tianze Zhang & Libo Chang & Xiaofeng Zhang & Hujie Wan & Na Liu & Liujiang Zhou & Xu Xiao, 2022. "Simultaneously tuning interlayer spacing and termination of MXenes by Lewis-basic halides," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. Zhengxin Zhu & Zaichun Liu & Yichen Yin & Yuan Yuan & Yahan Meng & Taoli Jiang & Qia Peng & Weiping Wang & Wei Chen, 2022. "Production of a hybrid capacitive storage device via hydrogen gas and carbon electrodes coupling," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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