Hu Jing, Tang Xiaomin, Dai Qing, Liu Zhiqiang, Zhang Huamin, Zheng Anmin, Yuan Zhizhang, Li Xianfeng
Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Nat Commun. 2021 Jun 7;12(1):3409. doi: 10.1038/s41467-021-23721-9.
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, 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.
具有快速和选择性离子传输功能的膜在储能装置中具有很高的需求。层状双氢氧化物（LDHs）具有均匀的层间通道和大量共价键合在二维（2D）主体层内的羟基，使其成为高性能膜的绝佳候选材料。然而，关于LDHs用于离子分离的相关研究相当罕见，尤其是对LDHs中离子传输行为的深入研究。在此，我们报道了一种基于LDHs的复合膜，具有快速和选择性离子传输功能，用于液流电池应用。揭示了氢氧根离子通过LDHs的载体（标准扩散）和Grotthuss（质子跳跃）机制进行传输。基于LDHs的膜使碱性锌基液流电池能够在200 mA cm下运行，在400次循环中能量效率达到82.36%。这项研究深入了解了LDHs中的离子传输，并进一步激发了它们在其他能源相关装置中的应用。
