School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China.
Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
Angew Chem Int Ed Engl. 2023 Mar 27;62(14):e202218745. doi: 10.1002/anie.202218745. Epub 2023 Feb 15.
Aqueous rechargeable batteries are prospective candidates for large-scale grid energy storage. However, traditional anode materials applied lack acid-alkali co-tolerance. Herein, we report a covalent organic framework containing pyrazine (C=N) and phenylimino (-NH-) groups (HPP-COF) as a long-cycle and high-rate anode for both acidic and alkaline batteries. The HPP-COF's robust covalent linkage and the hydrogen bond network between -NH- and water molecules collectively improve the acid-alkaline co-tolerance. More importantly, the hydrogen bond network promotes the rapid transport of H /OH by the Grotthuss mechanism. As a result, the HPP-COF delivers a superior capacity and cycle stability (66.6 mAh g @ 30 A g , over 40000 cycles in 1 M H SO electrolyte; 91.7 mAh g @ 100 A g , over 30000 cycles @ 30 A g in 1 M NaOH electrolyte). The work opens a new direction for the structural design and application of COF materials in acidic and alkaline batteries.
水系可充电电池是大规模电网储能的有前途的候选者。然而，应用的传统阳极材料缺乏酸碱共容性。在此，我们报告了一种含有吡嗪（C=N）和亚苯基亚氨基（-NH-）基团的共价有机骨架（HPP-COF），作为用于酸性和碱性电池的长循环和高倍率阳极。HPP-COF 的坚固共价键和 -NH-与水分子之间的氢键网络共同提高了酸碱共容性。更重要的是，氢键网络通过 Grotthuss 机制促进 H+/OH-的快速传输。因此，HPP-COF 提供了卓越的容量和循环稳定性（在 1 M H2SO4 电解液中以 30 A g-1 的电流密度可提供 66.6 mAh g-1 的容量，循环 40000 次以上；在 1 M NaOH 电解液中以 30 A g-1 的电流密度可提供 91.7 mAh g-1 的容量，循环 30000 次以上）。这项工作为 COF 材料在酸性和碱性电池中的结构设计和应用开辟了新的方向。
