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Insights into memory effect mechanisms of layered double hydroxides with solid-state NMR spectroscopy

Author

Listed:
  • Li Jin

    (Nanjing University)

  • Xiaoyuan Zhou

    (Nanjing University)

  • Fang Wang

    (Nanjing University)

  • Xiang Ning

    (Nanjing University)

  • Yujie Wen

    (Nanjing University)

  • Benteng Song

    (Nanjing University)

  • Changju Yang

    (Nanjing University)

  • Di Wu

    (Nanjing University of Finance and Economics)

  • Xiaokang Ke

    (Nanjing University)

  • Luming Peng

    (Nanjing University
    Nanjing University
    Nanjing University)

Abstract

Layered double oxides (LDOs) can restore the parent layered double hydroxides (LDHs) structure under hydrous conditions, and this “memory effect” plays a critical role in the applications of LDHs, yet the detailed mechanism is still under debate. Here, we apply a strategy based on ex situ and in situ solid-state NMR spectroscopy to monitor the Mg/Al-LDO structure changes during recovery at the atomic scale. Despite the common belief that aqueous solution is required, we discover that the structure recovery can occur in a virtually solid-state process. Local structural information obtained with NMR spectroscopy shows that the recovery in aqueous solution follows dissolution-recrystallization mechanism, while the solid-state recovery is retro-topotactic, indicating a true “memory effect”. The amount of water is key in determining the interactions of water with oxides, thus the memory effect mechanism. The results also provide a more environmentally friendly and economically feasible LDHs preparation route.

Suggested Citation

  • Li Jin & Xiaoyuan Zhou & Fang Wang & Xiang Ning & Yujie Wen & Benteng Song & Changju Yang & Di Wu & Xiaokang Ke & Luming Peng, 2022. "Insights into memory effect mechanisms of layered double hydroxides with solid-state NMR spectroscopy," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33912-7
    DOI: 10.1038/s41467-022-33912-7
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    References listed on IDEAS

    as
    1. Evan Wenbo Zhao & Tao Liu & Erlendur Jónsson & Jeongjae Lee & Israel Temprano & Rajesh B. Jethwa & Anqi Wang & Holly Smith & Javier Carretero-González & Qilei Song & Clare P. Grey, 2020. "In situ NMR metrology reveals reaction mechanisms in redox flow batteries," Nature, Nature, vol. 579(7798), pages 224-228, March.
    2. Zhimi Hu & Xu Xiao & Huanyu Jin & Tianqi Li & Ming Chen & Zhun Liang & Zhengfeng Guo & Jia Li & Jun Wan & Liang Huang & Yanrong Zhang & Guang Feng & Jun Zhou, 2017. "Rapid mass production of two-dimensional metal oxides and hydroxides via the molten salts method," Nature Communications, Nature, vol. 8(1), pages 1-9, August.
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