Layered double hydroxide membrane with high hydroxide conductivity and ion selectivity for energy storage device

Jing Hu, Xiaomin Tang, Qing Dai, Zhiqiang Liu, Huamin Zhang, Anmin Zheng (), Zhizhang Yuan () and Xianfeng Li ()
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Jing Hu: Chinese Academy of Sciences
Xiaomin Tang: University of Chinese Academy of Sciences
Qing Dai: Chinese Academy of Sciences
Zhiqiang Liu: Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences
Huamin Zhang: Chinese Academy of Sciences
Anmin Zheng: Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences
Zhizhang Yuan: Chinese Academy of Sciences
Xianfeng Li: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Membranes with fast and selective ions transport are highly demanded for energy storage devices. Layered double hydroxides (LDHs), bearing uniform interlayer galleries and abundant hydroxyl groups covalently bonded within two-dimensional (2D) host layers, make them superb candidates for high-performance membranes. However, related research on LDHs for ions separation is quite rare, especially the deep-going study on ions transport behavior in LDHs. Here, we report a LDHs-based composite membrane with fast and selective ions transport for flow battery application. The hydroxide ions transport through LDHs via vehicular (standard diffusion) & Grotthuss (proton hopping) mechanisms is uncovered. The LDHs-based membrane enables an alkaline zinc-based flow battery to operate at 200 mA cm−2, along with an energy efficiency of 82.36% for 400 cycles. This study offers an in-depth understanding of ions transport in LDHs and further inspires their applications in other energy-related devices.

Date: 2021
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DOI: 10.1038/s41467-021-23721-9

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