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The effect of hydration number on the interfacial transport of sodium ions

Author

Listed:
  • Jinbo Peng

    (Peking University
    University of Regensburg)

  • Duanyun Cao

    (Peking University)

  • Zhili He

    (Peking University)

  • Jing Guo

    (Peking University)

  • Prokop Hapala

    (Czech Academy of Sciences)

  • Runze Ma

    (Peking University)

  • Bowei Cheng

    (Peking University)

  • Ji Chen

    (University College London)

  • Wen Jun Xie

    (Peking University)

  • Xin-Zheng Li

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Pavel Jelínek

    (Czech Academy of Sciences
    Palacky University)

  • Li-Mei Xu

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Yi Qin Gao

    (Peking University)

  • En-Ge Wang

    (Peking University
    Collaborative Innovation Center of Quantum Matter
    University of Chinese Academy of Sciences)

  • Ying Jiang

    (Peking University
    Collaborative Innovation Center of Quantum Matter
    University of Chinese Academy of Sciences)

Abstract

Ion hydration and transport at interfaces are relevant to a wide range of applied fields and natural processes1–5. Interfacial effects are particularly profound in confined geometries such as nanometre-sized channels6–8, where the mechanisms of ion transport in bulk solutions may not apply9,10. To correlate atomic structure with the transport properties of hydrated ions, both the interfacial inhomogeneity and the complex competing interactions among ions, water and surfaces require detailed molecular-level characterization. Here we constructed individual sodium ion (Na+) hydrates on a NaCl(001) surface by progressively attaching single water molecules (one to five) to the Na+ ion using a combined scanning tunnelling microscopy and noncontact atomic force microscopy system. We found that the Na+ ion hydrated with three water molecules diffuses orders of magnitude more quickly than other ion hydrates. Ab initio calculations revealed that such high ion mobility arises from the existence of a metastable state, in which the three water molecules around the Na+ ion can rotate collectively with a rather small energy barrier. This scenario would apply even at room temperature according to our classical molecular dynamics simulations. Our work suggests that anomalously high diffusion rates for specific hydration numbers of ions are generally determined by the degree of symmetry match between the hydrates and the surface lattice.

Suggested Citation

  • Jinbo Peng & Duanyun Cao & Zhili He & Jing Guo & Prokop Hapala & Runze Ma & Bowei Cheng & Ji Chen & Wen Jun Xie & Xin-Zheng Li & Pavel Jelínek & Li-Mei Xu & Yi Qin Gao & En-Ge Wang & Ying Jiang, 2018. "The effect of hydration number on the interfacial transport of sodium ions," Nature, Nature, vol. 557(7707), pages 701-705, May.
  • Handle: RePEc:nat:nature:v:557:y:2018:i:7707:d:10.1038_s41586-018-0122-2
    DOI: 10.1038/s41586-018-0122-2
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    Cited by:

    1. Rui Shi & Anthony J. Cooper & Hajime Tanaka, 2023. "Impact of hierarchical water dipole orderings on the dynamics of aqueous salt solutions," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Ye Tian & Botao Huang & Yizhi Song & Yirui Zhang & Dong Guan & Jiani Hong & Duanyun Cao & Enge Wang & Limei Xu & Yang Shao-Horn & Ying Jiang, 2024. "Effect of ion-specific water structures at metal surfaces on hydrogen production," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    3. Zhang, Yujiao & Niu, Shengli & Xia, Sunwen & Liu, Sitong & Liu, Jisen, 2023. "One-step conversion of acidified oil to biodiesel by novel bifunctional SrZr1-xFexO3 catalyst," Renewable Energy, Elsevier, vol. 217(C).
    4. Chunyi Zhang & Shuwen Yue & Athanassios Z. Panagiotopoulos & Michael L. Klein & Xifan Wu, 2022. "Dissolving salt is not equivalent to applying a pressure on water," Nature Communications, Nature, vol. 13(1), pages 1-6, December.

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