Liu Yongyao, Li Zhonglin, Han Yuejiang, Ji Zhenyu, Li Hengbo, Liu Yuanzheng, Wei Yifan, Chen Cheng, He Xiang, Wu Mingyan
Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China.
ChemSusChem. 2023 Apr 6;16(7):e202202305. doi: 10.1002/cssc.202202305. Epub 2023 Feb 23.
Recently, metal-organic frameworks (MOFs) as the cathode materials for aqueous zinc-ion batteries (ZIBs) received growing attention. Herein, a novel MOF, Ni-Ndi-trz (Ndi-trz=2,7-di(4H-1,2,4-triazol-4-yl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone) was synthesized through a solvothermal method. Its rational design using a naphthalene diimide (Ndi) core allowed the formation of a four-fold interpenetrated pcu (primitive cubic) topology. The as-synthesized Ni-Ndi-trz is highly stable over a wide pH range (0-12) for 30 days, which is critical to ensure the decent cyclability of zinc-ion batteries (ZIBs). When used as the cathode material of ZIBs, it shows a high initial specific capacity of 90.7 mAh g and excellent cycling stability. Remarkably, three-electrode system tests, ex situ FTIR, UV/Vis and XPS spectra revealed that the Ndi core of Ni-Ndi-trz undergoes a reversible interconversion between the keto and enol forms when interacting with Zn ions. This work may shed light on the feasibility of designing novel MOFs and exploring their mechanisms for zinc ion batteries.
最近，金属有机框架（MOFs）作为水系锌离子电池（ZIBs）的阴极材料受到了越来越多的关注。在此，通过溶剂热法合成了一种新型MOF，即Ni-Ndi-trz（Ndi-trz = 2,7-二（4H-1,2,4-三唑-4-基）苯并[lmn][3,8]菲咯啉-1,3,6,8（2H,7H）-四酮）。使用萘二亚胺（Ndi）核进行合理设计，使其形成了四重互穿的pcu（原始立方）拓扑结构。所合成的Ni-Ndi-trz在较宽的pH范围（0-12）内30天高度稳定，这对于确保锌离子电池（ZIBs）良好的循环稳定性至关重要。当用作ZIBs的阴极材料时，它表现出90.7 mAh g的高初始比容量和出色的循环稳定性。值得注意的是，三电极系统测试、非原位FTIR、UV/Vis和XPS光谱表明，Ni-Ndi-trz的Ndi核在与Zn离子相互作用时会在酮式和烯醇式之间发生可逆的相互转化。这项工作可能为设计新型MOFs及其在锌离子电池中的作用机制的可行性提供启示。
