Uniformly Dispersed Freestanding Carbon Nanofiber/Graphene Electrodes Made by a Scalable Biological Method for High-Performance Flexible Supercapacitors
Uniformly Dispersed Freestanding Carbon Nanofiber/Graphene Electrodes Made by a Scalable Biological Method for High-Performance Flexible Supercapacitors
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DOI：
10.1002/adfm.201803075
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发表时间：
2018-11-28
影响因子：
19
通讯作者：
Xu, Yunhua
中科院分区：
文献类型：
--
作者：
Luo, Honglin;Xiong, Peixun;Xu, Yunhua
采用可扩展的膜-液界面培养法和炭化法制备独立的碳纳米纤维/石墨烯纳米片复合材料。碳纳米纤维（CNFs）和石墨烯纳米片（GNs）均匀分布在三维（3D）导电结构中。具有良好的柔韧性、良好的结构稳定性和较高的比表面积。作为超级电容器电极，3D纳米复合材料具有良好的电化学性能，在1 a g（-1）下具有215 F g（-1）的高电容，并且具有非凡的循环稳定性，在5000次循环后不发生电容退化，是超级电容器中性能最好的碳电极之一。在900 W kg（-1）的功率密度下，能量密度高达20 Wh kg(-1)，优于其他cnf电极材料。三维纳米复合电极优异的电化学性能归功于其独特的结构：三维导电网络、碳纳米纤维和石墨烯纳米片的均匀分散、坚固的力学性能和大的比表面积。制备方法简单、性能优良、力学性能稳定，使得三维纳米复合材料作为一种新型超级电容器电极具有广阔的应用前景。
A novel facile and scalable strategy is developed to prepare freestanding carbon nanofiber/graphene nanosheet composites using a scalable membrane-liquid interface culture method followed by carbonization. The carbon nanofibers (CNFs) and graphene nanosheets (GNs) are uniformly dispersed in a three-dimensional (3D) conductive architecture. Robust mechanical properties are demonstrated with fine flexibility, good structure stability, and high specific surface area. As supercapacitor electrodes, the 3D nanocomposite delivers good electrochemical performance with a high capacitance of 215 F g(-1) at 1 A g(-1) and extraordinary cycling stability with no capacitance degradation after 5000 cycles, which are among the best carbon electrodes in supercapacitors. The energy density is as high as 20 Wh kg(-1) at a power density of 900 W kg(-1), superior to other CNF-based electrode materials. The superb electrochemical performance of the 3D nanocomposite electrode is ascribed to the unique structure: 3D conductive network, uniform dispersion of carbon nanofibers and graphene nanosheets, robust mechanical property, and large specific surface area. The combination of facile fabrication method, good performance, and robust mechanical property makes the 3D nanocomposites very promising as a new type of superior supercapacitor electrodes.