Hierarchically porous carbon black/graphene hybrid fibers for high performance flexible supercapacitors
Hierarchically porous carbon black/graphene hybrid fibers for high performance flexible supercapacitors
复制标题
用于高性能柔性超级电容器的分级多孔炭黑/石墨烯混合纤维
DOI：
10.1039/c6ra08799j
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发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhu, Meifang
中科院分区：
文献类型：
--
作者：
Ma, Wujun;Chen, Shaohua;Zhu, Meifang
为了满足轻量化、柔性化、甚至可穿戴式电子产品的快速发展，开发与之相匹配的高效储能设备是至关重要的。石墨烯纤维具有优异的力学和电学性能，因此基于石墨烯纤维的超级电容器被认为是最有前途的候选材料之一。然而，基于整齐的石墨烯纤维的SCs普遍存在电容低和倍率性能差的问题，这在很大程度上限制了其潜在的广泛应用。在这里，我们报道了一种简单、低成本和可扩展的湿法纺丝方法来制备多孔炭黑/还原石墨烯氧化物(CB/rGO)杂化纤维。杂化纤维具有很高的比表面积(254.6 m~2·g·−~1)和层次化的多孔纳米结构。用该混杂纤维组装的柔性固态SC具有高容量(97.5F cm−3)、优良的循环稳定性(2 0 0 0年循环容量保持率为95.9%)、优异的能量密度(2.8 mW h cm−3)和超高功率密度(12 0 0 mW cm−3)。它的物理形状和电化学性能在长时间的周期性机械变形下也保持得很好，这在可穿戴电子设备中特别有希望。
To meet the rapid development of lightweight, flexible, and even wearable electronics, it is critically important to develop matchable, highly efficient energy-storage devices for their energy supply. Graphene fiber-based supercapacitors (SCs) are considered as one of the promising candidates because of the superior mechanical and electrical properties of graphene fibers. However, SCs based on neat graphene fibers generally suffer a low capacitance and poor rate performance, which largely restrict their potentially wide applications. Here, we report a simple, low cost and scalable wet-spinning method to fabricate porous carbon black/reduced graphene oxide (CB/rGO) hybrid fibers. The hybrid fibers possess very high surface area (254.6 m2 g−1) and a hierarchically porous nanostructure. A flexible solid-state SC was assembled using the hybrid fiber, which exhibited high capacitance (97.5 F cm−3), excellent cycling stability (95.9% capacitance retention over 2000 cycles), superior energy density (2.8 mW h cm−3) and ultrahigh power density (1200 mW cm−3). Its physical shape and electrochemical performance is also very well maintained under long-time periodic mechanical deformation that is particularly promising for wearable electronic devices.