Coaxial Fiber Supercapacitor Using All-Carbon Material Electrodes
Coaxial Fiber Supercapacitor Using All-Carbon Material Electrodes
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DOI：
10.1021/nn4016345
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发表时间：
2013-07-01
期刊：
影响因子：
17.1
通讯作者：
Lee, Young Hee
中科院分区：
文献类型：
--
作者：
Viet Thong Le;Kim, Heetae;Lee, Young Hee
本文报道了一种同轴纤维超级电容器，它是由包覆多壁碳纳米管的碳微纤维束作为芯电极，碳滤纸作为外电极组成。通过每个电极的半电池测试来确定电极体积的比率。在芯电极直径为230 μ m时，电容量达到6.3 mF cm（-1）（86.8 mF cm（-2）），在功率密度为13.7 μ W cm（-1）（189.4 μ W cm（-2））时，测得的能量密度为0.7 μ Wh cm（-1）（9.8 μ Wh cm（-2）），这比以前的报道高得多。在180度弯曲时循环伏安特性的变化可以忽略不计，具有优异的循环性能。同轴纤维超级电容器的高容量、高能量密度和高功率密度不仅归因于其芯电极的同轴结构和束的高有效表面积，而且归因于具有高导电性的全碳材料电极。我们的同轴光纤超级电容器可以促进纺织电子在不久的将来的发展。
We report a coaxial fiber supercapacitor, which consists of carbon microfiber bundles coated with multiwalled carbon nanotubes as a core electrode and carbon nanofiber paper as an outer electrode. The ratio of electrode volumes was determined by a half-cell test of each electrode. The capacitance reached 6.3 mF cm(-1) (86.8 mF cm(-2)) at a core electrode diameter of 230 mu m and the measured energy density was 0.7 mu Wh cm(-1) (9.8 mu Wh cm(-2)) at a power density of 13.7 mu W cm(-1) (189.4 mu W cm(-2)), which were much higher than the previous reports. The change in the cyclic voltammetry characteristics was negligible at 180 degrees bending, with excellent cycling performance. The high capacitance, high energy density, and power density of the coaxial fiber supercapacitor are attributed to not only high effective surface area due to its coaxial structure and bundle of the core electrode, but also all-carbon materials electrodes which have high conductivity. Our coaxial fiber supercapacitor can promote the development of textile electronics in near future.