Three-Dimensional Porous Carbon Nanotubes/Reduced Graphene Oxide Fiber from Rapid Phase Separation for a High-Rate All-Solid-State Supercapacitor
Three-Dimensional Porous Carbon Nanotubes/Reduced Graphene Oxide Fiber from Rapid Phase Separation for a High-Rate All-Solid-State Supercapacitor
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DOI：
10.1021/acsami.8b19359
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发表时间：
2019-03-06
影响因子：
9.5
通讯作者：
Zhu, Meifang
中科院分区：
文献类型：
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作者：
Ma, Wujun;Li, Min;Zhu, Meifang
基于石墨烯纤维的超级电容器(SC)作为最具潜力的便携式/可穿戴式储能设备正在兴起。然而，它们的速率性能并不令人满意，这极大地阻碍了它们的广泛实际应用。本文采用非溶剂诱导快速相分离-联氨还原法制备了三维多孔碳纳米管/氧化石墨烯纤维。由于其三维多孔结构、大的比表面积和高的电导率，所制备的SC具有高的体积电容54.9F cm(-3)和高的能量密度和功率密度(分别为4.9mW h cm(-3)和15.5W cm(-3))。值得注意的是，SC在50V S(-1)的高扫描速率下工作良好，并显示出快速的频率响应，其短时间常数为78ms。此外，纤维状SC在机械弯曲和随后的矫直过程中也表现出非常稳定的电化学性能，这表明它在柔性电子器件中具有巨大的应用潜力。
Graphene fiber-based supercapacitors (SCs) are rising as having the greatest potential for portable/wearable energy storage devices. However, their rate performance is not well pleasing, which greatly impedes their broad practical applications. Herein, three-dimensional porous carbon nanotube/reduced graphene oxide fibers were prepared by a nonsolvent-induced rapid phase separation method followed by hydrazine vapor reduction. Benefitting from their three-dimensional porous structure, large specific surface area, and high conductivity, the fabricated SC exhibits a high volume capacitance of 54.9 F cm(-3) and high energy and power densities (4.9 m W h cm(-3) and 15.5 W cm(-3), respectively). Remarkably, the SC works well at a high scan rate of 50 V s(-1) and shows a fast frequency response with a short time constant of 78 ms. Furthermore, the fiber-shaped SC also exhibits very stable electrochemical performances when it is subjected to mechanical bending and succeeding straightening process, indicating its great potential application in flexible electronic devices.