Inverted Design for High-Performance Supercapacitor Via Co(OH)2-Derived Highly Oriented MOF Electrodes
Inverted Design for High-Performance Supercapacitor Via Co(OH)2-Derived Highly Oriented MOF Electrodes
复制标题
通过 Co(OH)2 衍生的高度取向 MOF 电极实现高性能超级电容器的倒置设计
DOI：
10.1002/aenm.201702294
复制
发表时间：
2018-03-05
影响因子：
27.8
通讯作者：
Zheng, Weitao
中科院分区：
文献类型：
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作者：
Deng, Ting;Lu, Yue;Zheng, Weitao
由于高比表面积和潜在的氧化还原位点，金属有机框架（MOF）被认为是超级电容器的有前途的候选者。然而，它们的改组方向和低电导率性质导致性能严重下降。设计一种可操作且有效的方法来解决这些问题对于 MOF 在超级电容器中的应用具有最重要的意义。 MOFs 将自身作为模板或前体来制备目标产品是常见的方式。但反过来想，用目标产品制备MOF可能是解决MOF在超级电容器性能瓶颈的方法。在此，提出了一种使用Co(OH)(2)作为模板和前驱体来制造垂直取向MOF电极的新策略。与粉末状MOF相比，该电极显示出1044 Fg(-1)的双倍高比电容和优异的倍率性能。还制备了非对称超级电容器，在功率密度为1500 W·kg(-1)时，最大能量密度为28.5 W·h·kg(-1)，最大能量密度为24000 W·kg(-1)，剩余能量密度为13.3 W·h·kg(-1)。因此，所提出的策略为释放MOF的固有优势铺平了道路，并启发了具有最佳性能的先进MOF合成。
Metal organic frameworks (MOFs) are considered as promising candidates for supercapacitors because of high specific area and potential redox sites. However, their shuffled orientations and low conductivity nature lead to severely-degraded performance. Designing an accessibly-manipulated and efficient method to address those issues is of outmost significance for MOF application in supercapacitors. It is the common way that MOFs scarify themselves as templates or precursors to prepare target products. But to reversely think it, using target products to prepare MOF could be the way to unlock the bottleneck of MOFs' performance in supercapacitors. Herein, a novel strategy using Co(OH)(2) as both the template and precursor to fabricate vertically-oriented MOF electrode is proposed. The electrode shows a double high specific capacitance of 1044 Fg(-1) and excellent rate capability compared to MOF in powder form. An asymmetric supercapacitor was also fabricated, which delivers a maximum energy density of 28.5 W h kg(-1) at a power density of 1500 W kg(-1), and the maximum of 24000 W kg(-1) can be obtained with a remaining energy density of 13.3 W h kg(-1). Therefore, the proposed strategy paves the way to unlock the inherent advantages of MOFs and also inspires for advanced MOF synthesis with optimum performance.