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Unveiling the neglected role of oxygen doping in nitrogen-doped carbon for enhanced capacitive deionization performance

Author

Listed:
  • Jiabao Li

    (Yangzhou University)

  • Ruoxing Wang

    (Yangzhou University)

  • Lanlan Han

    (Yangzhou University)

  • Tianyi Wang

    (Yangzhou University)

  • Yusuke Asakura

    (Nagoya University)

  • Chengyin Wang

    (Yangzhou University)

  • Guoxiu Wang

    (University of Technology)

  • Xingtao Xu

    (Zhejiang Ocean University)

  • Yusuke Yamauchi

    (Nagoya University
    The University of Queensland
    The University of Queensland)

Abstract

Nitrogen-doped carbons (NCs) have demonstrated notable advantages for application in capacitive deionization (CDI). However, the potential roles of different nitrogen configurations in the CDI process, especially how the neglected oxygen doping synergistically works, remain unclear. In this work, we systematically addressed these critical issues and revealed the significant role of trace oxygen doping in enhancing the desalination performance of NC electrodes. By introducing oxygen into nitrogen-doped carbon nanosheets (ONC-S), using guanine as the precursor, we obtained abundant pyridinic and pyrrolic nitrogen configurations. This design aims to synergistically enhance the charge distribution, wettability, and ion diffusion of the target electrodes. Compared with commercial activated carbon and other state-of-the-art materials, our ONC-S electrode demonstrates superior specific capacitance, excellent cycling stability, and enhanced desalination efficiency. These findings highlight the synergistic effects of trace oxygen doping and the nitrogen configuration, offering valuable insights into the mechanisms driving the improved CDI performance.

Suggested Citation

  • Jiabao Li & Ruoxing Wang & Lanlan Han & Tianyi Wang & Yusuke Asakura & Chengyin Wang & Guoxiu Wang & Xingtao Xu & Yusuke Yamauchi, 2025. "Unveiling the neglected role of oxygen doping in nitrogen-doped carbon for enhanced capacitive deionization performance," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56694-0
    DOI: 10.1038/s41467-025-56694-0
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    References listed on IDEAS

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    1. Mingxing Liang & Yifan Ren & Jun Cui & Xiaochen Zhang & Siyang Xing & Jingjing Lei & Mengyao He & Haijiao Xie & Libo Deng & Fei Yu & Jie Ma, 2024. "Order-in-disordered ultrathin carbon nanostructure with nitrogen-rich defects bridged by pseudographitic domains for high-performance ion capture," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
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