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

Li Jin, Xiaoyuan Zhou, Fang Wang, Xiang Ning, Yujie Wen, Benteng Song, Changju Yang, Di Wu, Xiaokang Ke and Luming Peng ()
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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

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-33912-7

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