2D Metal-Organic Frameworks Derived Nanocarbon Arrays for Substrate Enhancement in Flexible Supercapacitors
2D Metal-Organic Frameworks Derived Nanocarbon Arrays for Substrate Enhancement in Flexible Supercapacitors
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DOI：
10.1002/smll.201702641
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发表时间：
2018-10-25
期刊：
影响因子：
13.3
通讯作者：
Wang, John
中科院分区：
文献类型：
--
作者：
Liu, Ximeng;Guan, Cao;Wang, John
活性材料在碳布上的直接组装是实现柔性储能电极的一种很有前途的方法。然而，这种电极的总表面积和电导率通常是有限的。本文采用溶液+碳化法在碳布上成功制备了二维金属有机骨架衍生的纳米碳球阵列。在MOFC阵列的生长过程中，活性材料的生长位点大大增加，等效串联电阻降低，这有助于裸CC衬底的增强。在柔性CC/MOFC衬底上装饰MnO 2和Bi 2 O 3的片状物之后，与原始碳布上的活性材料相比，分级电极材料分别显示出面积电容的约50%和100%的突然改善。柔性超级电容器可以使用两个分层电极进一步组装，其在2.55mW cm（-2）的功率密度下显示出124.8 μ Wh cm（-2）的能量密度。
Direct assembling of active materials on carbon cloth (CC) is a promising way to achieve flexible electrodes for energy storage. However, the overall surface area and electrical conductivity of such electrodes are usually limited. Herein, 2D metal-organic framework derived nanocarbon nanowall (MOFC) arrays are successfully developed on carbon cloth by a facile solution + carbonization process. Upon growth of the MOFC arrays, the sites for growth of the active materials are greatly increased, and the equivalent series resistance is decreased, which contribute to the enhancement of the bare CC substrate. After decorating ultrathin flakes of MnO2 and Bi2O3 on the flexible CC/MOFC substrate, the hierarchical electrode materials show an abrupt improvement of areal capacitances by around 50% and 100%, respectively, compared to those of the active materials on pristine carbon cloth. A flexible supercapacitor can be further assembled using two hierarchical electrodes, which demonstrates an energy density of 124.8 mu Wh cm(-2) at the power density of 2.55 mW cm(-2).