Two novel interpenetrated 2-fold Mn-based metal-organic frameworks (MOFs) (SC-7 and SC-8), assembled from the rigid ligand H3TATB (4,4',4''-s-triazine-2,4,6-triyl-tribenzoic acid) and Mn ions with the assistance of the flexible N-donor linker BIB (bis((1H-imidazol-1-yl)methyl)benzene) or TIPA (tris(4-imidazolylphenyl)amine), have been successfully prepared. The as-obtained MOFs show two distinct topological structures with the symbols 44·62 and (52·6)(53·6·73·82·9) due to discrepancies between the flexibilities of the bi-imidazole and tri-imidazole linkers. The electrodes based on the as-prepared bulk Mn-MOFs behave as alkaline batteries in electrochemical cells and deliver high capacities (279 and 172 mA h g-1 at 1 A g-1 for SC-7 and SC-8, respectively). Theoretical mechanism analyses indicate that the surface-controlled (k1v) process can be transformed into a diffusion-dominated (k2v1/2) process when the charging time exceeds 30 seconds in the MOF-based systems. Our research provides a new strategy to construct an increasing number of stable redox sites in MOFs for application to battery-capacitor hybrid devices.

中文翻译：

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两种互穿互穿的Mn基金属有机骨架（MOF）作为电池型电极材料进行电荷存储。

由刚性配体H3TATB（4,4'，4''-s-triazine-2,4，借助柔性N供体接头BIB（双（（（1H-咪唑-1-基）甲基）苯）苯或TIPA（三（4-咪唑基苯基）胺）合成6-三基三苯甲酸）和Mn离子已经准备好了。由于双咪唑和三咪唑接头之间的柔性差异，如此获得的MOF表现出两个不同的拓扑结构，分别用符号44·62和（52·6）（53·6·73·82·9）表示。基于所制备的块状Mn-MOF的电极在电化学电池中可充当碱性电池，并提供高容量（SC-7和SC-8分别在1 A g-1时为279和172 mA h g-1）。理论机理分析表明，在基于MOF的系统中，充电时间超过30秒时，表面控制（k1v）过程可以转换为扩散主导（k2v1 / 2）过程。我们的研究提供了一种新的策略，可以在MOF中构建越来越多的稳定氧化还原位点，以应用于电池-电容器混合设备。