Yang Hui, Li Ang, Zhou Chunli, Liu Xuewei, Chen Xiaohong, Liu Haiyan, Liu Tao, Song Huaihe
State Key Laboratory of Chemical Resources Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China.
Tangshan Key Laboratory of Optoelectronic Conversion Materials, School of Physical Science and Technology, Tangshan Normal University, Tangshan 063000, China.
Nanomaterials (Basel). 2022 Nov 7;12(21):3926. doi: 10.3390/nano12213926.
Metal-organic frameworks (MOFs) have attracted extensive attention as precursors for the preparation of carbon-based materials due to their highly controllable composition, structure, and pore size distribution. However, there are few reports of MOFs using p-phenylenediamine (pPD) as the organic ligand. In this work, we report the preparation of a bimetallic MOF (CoCu-pPD) with pPD as the organic ligand, and its derived hollow carbon spheres (BMHCS). CoCu-pPD exhibits a hollow spherical structure assembled by nanosheets. BMHCS inherits the unique hollow spherical structure of CoCu-pPD, which also shows a large specific surface area and heteroatom doping. When using as the anode of sodium-ion batteries (SIBs), BMHCS exhibits excellent cycling stability (the capacity of 306 mA h g after 300 cycles at a current density of 1 A g and the capacity retention rate of 90%) and rate capability (the sodium storage capacity of 240 mA h g at 5 A g). This work not only provides a strategy for the preparation of pPD-based bimetallic-MOFs, but also enhances the thermal stability of the pPD-based MOFs. In addition, this work also offers a new case for the morphology control of assembled carbon materials and has achieved excellent performance in the field of SIBs.
金属有机框架材料（MOFs）因其组成、结构和孔径分布具有高度可控性，作为制备碳基材料的前驱体而受到广泛关注。然而，以对苯二胺（pPD）作为有机配体的MOFs报道较少。在本工作中，我们报道了以pPD作为有机配体的双金属MOF（CoCu-pPD）及其衍生的中空碳球（BMHCS）的制备。CoCu-pPD呈现出由纳米片组装而成的中空球形结构。BMHCS继承了CoCu-pPD独特的中空球形结构，还具有较大的比表面积和杂原子掺杂。当用作钠离子电池（SIBs）的负极时，BMHCS表现出优异的循环稳定性（在1 A g的电流密度下循环300次后容量为306 mA h g，容量保持率为90%）和倍率性能（在5 A g时储钠容量为240 mA h g）。本工作不仅为制备基于pPD的双金属MOFs提供了一种策略，还提高了基于pPD的MOFs的热稳定性。此外，本工作还为组装碳材料的形貌控制提供了一个新的实例，并在SIBs领域取得了优异的性能。
