Ultrahigh energy fiber-shaped supercapacitors based on porous hollow conductive polymer composite fiber electrodes
Ultrahigh energy fiber-shaped supercapacitors based on porous hollow conductive polymer composite fiber electrodes
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基于多孔中空导电聚合物复合纤维电极的超高能量纤维状超级电容器
DOI：
10.1039/c8ta03903h
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发表时间：
2018-07-14
影响因子：
11.9
通讯作者：
Chen, Xudong
中科院分区：
文献类型：
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作者：
Zhang, Yangfan;Zhang, Xiyue;Chen, Xudong
为了满足可穿戴电子产品日益增长的需求，迫切需要在保持机械可靠性的同时表现出高电化学性能的纤维状超级电容器（FSC）。然而，开发具有纳米多孔微结构的纤维电极仍然具有挑战性。在这里，我们提出了高能量，超稳定的FSC设备的基础上，一类新的多孔，中空，导电复合纤维（PHCF）的多层结构。PHCF的纳米多孔结构显著增加了比表面积（98.1 m2 g-1）和孔体积（0.43 cm 3 g-1），但对机械性能的影响可以忽略不计。PHCF中的这种互连纳米多孔结构保证了电沉积PANI的高质量负载和高效率利用，并且衍生的纤维电极（PHCF @PANI）提供了2723 mF cm-2的高面积电容和前所未有的超稳定循环性能，在26000次循环中没有任何电容损失。 此外，基于PHCF @PANI的对称FSC（S-FSC）器件在447 μW cm− 2的功率密度下实现了55.3 μW h cm − 2的显著能量密度，远优于最近报道的FSC的值上级。此外，S-FSC能够承受各种变形，如反复弯曲，扭曲和打结，具有几乎不变的能力。
Fiber-shaped supercapacitors (FSCs) that exhibit high electrochemical performance while maintaining mechanical reliability are urgently needed to meet the growing demand for wearable electronics. However, developing fiber electrodes with nanoporous microstructures remains challenging. Here, we proposed high-energy, ultra-stable FSC devices based on a new class of porous, hollow, and conductive composite fibers (PHCFs) with a multilayer structure. The nanoporous structures of the PHCFs substantially increased both the specific surface area (98.1 m2 g−1) and the pore volume (0.43 cm3 g−1), but had a negligible influence on the mechanical properties. Such an interconnected nanoporous structure in the PHCFs guaranteed high mass loading and high efficiency utilization of electrodeposited PANI, and the derived fiber electrodes (PHCFs@PANI) delivered a high areal capacitance of 2723 mF cm−2 and unprecedented ultrastable cycle performance without any capacitance loss over 26 000 cycles. Furthermore, a symmetric FSC (S-FSC) device based on PHCFs@PANI achieved a remarkable energy density of 55.3 μW h cm−2 at a power density of 447 μW cm−2, values far superior to those of most recently reported FSCs. Moreover, the S-FSC was able to withstand various deformations, such as repeated bending, twisting, and knotting, with a nearly invariant capacity.