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Minimizing the electrosorption of water from humid ionic liquids on electrodes

Author

Listed:
  • Sheng Bi

    (Huazhong University of Science and Technology (HUST))

  • Runxi Wang

    (Huazhong University of Science and Technology (HUST))

  • Shuai Liu

    (Xiamen University)

  • Jiawei Yan

    (Xiamen University)

  • Bingwei Mao

    (Xiamen University)

  • Alexei A. Kornyshev

    (Imperial College London)

  • Guang Feng

    (Huazhong University of Science and Technology (HUST))

Abstract

In supercapacitors based on ionic liquid electrolytes, small amounts of absorbed water could potentially reduce the electrochemical window of electrolytes and cause performance degradation. The same would take place if ionic liquids are used as solvents for electrocatalysis involving the dissolved molecular species. In this work, we carry out molecular dynamics simulations, with gold and carbon electrodes in typical ionic liquids, hydrophobic and hydrophilic, to study electrosorption of water. We investigate the effects of hydrophobicity/hydrophilicity of ionic liquids and electrodes on interfacial distribution of ions and electrosorbed water. Results reveal that using hydrophilic ionic liquids would help to keep water molecules away from the negatively charged electrodes, even at large electrode polarizations. This conclusion is supported by electrochemical cyclic voltammetry measurements on gold and carbon electrodes in contact with humid ionic liquids. Thereby, our findings suggest potential mechanisms for protection of electrodes from water electrosorption.

Suggested Citation

  • Sheng Bi & Runxi Wang & Shuai Liu & Jiawei Yan & Bingwei Mao & Alexei A. Kornyshev & Guang Feng, 2018. "Minimizing the electrosorption of water from humid ionic liquids on electrodes," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07674-0
    DOI: 10.1038/s41467-018-07674-0
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    Cited by:

    1. Xiao-Ting Yin & En-Ming You & Ru-Yu Zhou & Li-Hong Zhu & Wei-Wei Wang & Kai-Xuan Li & De-Yin Wu & Yu Gu & Jian-Feng Li & Bing-Wei Mao & Jia-Wei Yan, 2024. "Unraveling the energy storage mechanism in graphene-based nonaqueous electrochemical capacitors by gap-enhanced Raman spectroscopy," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    2. Chao-Yu Li & Ming Chen & Shuai Liu & Xinyao Lu & Jinhui Meng & Jiawei Yan & Héctor D. Abruña & Guang Feng & Tianquan Lian, 2022. "Unconventional interfacial water structure of highly concentrated aqueous electrolytes at negative electrode polarizations," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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