Yang Jingjing, Mao Zhaofei, Zheng Ruiping, Liu Hao, Shi Lei
School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.
Institution of Smart Wearable Elect-textile, Tiangong University, Tianjin 300387, China.
Materials (Basel). 2020 Aug 26;13(17):3778. doi: 10.3390/ma13173778.
Yarn-shaped supercapacitors with great flexibility are highly anticipated for smart wearable devices. Herein, a device for continuously producing oriented nanofiber yarn based on solution blowing was invented, which was important for the nanofiber yarn electrode to realize mass production. Further, the yarn-shaped supercapacitor was assembled by the yarn electrode with the polypyrrole (PPy) grown on aligned carbon fiber bundles@Polyacrylonitrile nanofibers (CFs@PAN NFs). Electrical conductivity and mechanical properties of the yarn electrode can be improved by the carbon fiber bundles. The specific surface area of the yarn electrode can be enlarged by PPy. The yarn-shaped supercapacitors assembled by the PVA/LiCl/HPO gel electrolyte showed high areal specific capacitance of 353 mF cm at a current density of 0.1 A g, and the energy density was 48 μWh cm when the power density was 247 μW cm. The supercapacitors also exhibited terrific cycle stability (82% after 20,000 cycles). We also proved that this yarn-shaped supercapacitor could easily power up the light emitting diode. This yarn-shaped supercapacitor was meaningful for the development of the smart wearable devices, especially when combined with clothing or fabrics.
具有出色柔韧性的纱线状超级电容器在智能可穿戴设备中备受期待。在此，发明了一种基于溶液吹纺连续生产取向纳米纤维纱线的装置，这对于纳米纤维纱线电极实现大规模生产至关重要。此外，纱线状超级电容器由在排列的碳纤维束@聚丙烯腈纳米纤维（CFs@PAN NFs）上生长有聚吡咯（PPy）的纱线电极组装而成。碳纤维束可提高纱线电极的电导率和机械性能。PPy可增大纱线电极的比表面积。由PVA/LiCl/HPO凝胶电解质组装的纱线状超级电容器在电流密度为0.1 A g时表现出353 mF cm的高面积比电容，当功率密度为247 μW cm时能量密度为48 μWh cm。该超级电容器还表现出出色的循环稳定性（20000次循环后为82%）。我们还证明了这种纱线状超级电容器能够轻松为发光二极管供电。这种纱线状超级电容器对于智能可穿戴设备的发展具有重要意义，特别是当与衣物或织物结合时。
