Zhou Caixia, Gao Taotao, Wang Yujue, Liu Qilin, Huang Zhihan, Liu Xiaoxia, Qing Miaoqing, Xiao Dan
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610207, P. R. China.
College of Chemical Engineering, Sichuan University, Chengdu, 610064, P. R. China.
Small. 2019 Jan;15(1):e1803469. doi: 10.1002/smll.201803469. Epub 2018 Nov 27.
Fiber supercapacitors (FSCs) are promising energy storage devices in portable and wearable smart electronics. Currently, a major challenge for FSCs is simultaneously achieving high volumetric energy and power densities. Herein, the microscale fiber electrode is designed by using carbon fibers as substrates and capillary channels as microreactors to space-confined hydrothermal assembling. As P-doped graphene oxide/carbon fiber (PGO/CF) and NiCo O -based graphene oxide/carbon fiber (NCGO/CF) electrodes are successfully prepared, their unique hybrid structures exhibit a satisfactory electrochemical performance. An all-solid-state PGO/CF//NCGO/CF flexible asymmetric fiber supercapacitor (AFSC) based on the PGO/CF as the negative electrode, NCGO/CF hybrid electrode as the positive electrode, and poly(vinyl alcohol)/potassium hydroxide as the electrolyte is successfully assembled. The AFSC device delivers a higher volumetric energy density of 36.77 mW h cm at a power density of 142.5 mW cm . In addition, a double reference electrode system is adopted to analyze and reduce the IR drop, as well as effectively matching negative and positive electrodes, which is conducive for the optimization and improvement of energy density. For the AFSC device, its better flexibility and electrochemical properties create a promising potential for high-performance micro-supercapacitors. Furthermore, the introduction of the double reference electrode system provides an interesting method for the study on the electrochemical performances of two-electrode systems.
纤维超级电容器（FSCs）是便携式和可穿戴智能电子产品中很有前景的储能设备。目前，FSCs面临的一个主要挑战是同时实现高体积能量密度和功率密度。在此，通过使用碳纤维作为基底和毛细管通道作为微反应器进行空间受限水热组装来设计微尺度纤维电极。成功制备了磷掺杂氧化石墨烯/碳纤维（PGO/CF）和基于NiCoO的氧化石墨烯/碳纤维（NCGO/CF）电极，它们独特的混合结构展现出令人满意的电化学性能。基于PGO/CF作为负极、NCGO/CF混合电极作为正极以及聚乙烯醇/氢氧化钾作为电解质，成功组装了全固态PGO/CF//NCGO/CF柔性非对称纤维超级电容器（AFSC）。该AFSC器件在功率密度为142.5 mW/cm时，具有36.77 mW h/cm的更高体积能量密度。此外，采用双参比电极系统来分析和降低IR降，以及有效匹配正负极，这有利于能量密度的优化和提高。对于AFSC器件，其更好的柔韧性和电化学性能为高性能微型超级电容器创造了广阔的应用前景。此外，双参比电极系统的引入为研究双电极系统的电化学性能提供了一种有趣的方法。
