A MnO2 nanosheetisingle-wall carbon nanotube hybrid fiber for wearable solid-state supercapacitors
A MnO2 nanosheetisingle-wall carbon nanotube hybrid fiber for wearable solid-state supercapacitors
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DOI：
10.1016/j.carbon.2018.09.011
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发表时间：
2018-12-01
期刊：
影响因子：
10.9
通讯作者：
Cheng, Hui-Ming
中科院分区：
文献类型：
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作者：
Li, Guo-Xian;Hou, Peng-Xiang;Cheng, Hui-Ming
基于碳纳米管的纤维超级电容器因其卓越的机械和电气性能而被认为是可穿戴电子设备最有前途的电源之一。然而，如何获得活性材料负载量高的柔性高导电纤维以使超级电容器具有高能量和功率密度仍然是一个巨大的挑战。在这里，我们报告了一种由单壁碳纳米管和超薄MnO2纳米片组成的高导电混合纤维，通过可扩展的湿纺丝方法制备。混合纤维中活性MnO2的质量百分比高达75%，MnO2片材与单壁碳纳米管之间的紧密接触提供了高导电通路，而材料中丰富的孔隙实现了快速离子传输。结果，由混合纤维组装的柔性固态超级电容器表现出74.8 F cm(-3)的极高体积电容、10.4 mWh cm(-3)的能量密度和良好的循环稳定性。这种具有出色柔韧性的全固态纤维超级电容器也被编织成纺织品，展示了其照明可穿戴电子产品的能力。 (C) 2018 Elsevier Ltd. 保留所有权利。
Carbon nanotubes based fiber supercapacitor is considered as one of the most promising power sources for wearable electronic devices because of their remarkable mechanical and electrical properties. However, how to obtain flexible and highly conductive fibers with a high active material loading to give the supercapacitor high energy and power densities remains a great challenge. Here, we report a highly conductive hybrid fiber consisting of single-wall carbon nanotubes and ultrathin MnO2 nanosheets prepared by a scalable wet-spinning method. The mass percentage of active MnO2 in the hybrid fiber is as high as 75% and the intimate contact between the MnO2 sheets and the single-wall carbon nanotubes provides highly conductive pathways, while the abundant pores in the material enable fast ion transport. As a result, a flexible solid-state supercapacitor assembled from the hybrid fiber exhibits a very high volumetric capacitance of 74.8 F cm(-3), an energy density of 10.4 mWh cm(-3), and good cycling stability. This all-solid-state fiber supercapacitors with excellent flexibility are also woven into a textile demonstrating its ability of lighting wearable electronics. (C) 2018 Elsevier Ltd. All rights reserved.