Abstract Carbon fiber-based flexible supercapacitors have attracted wide attention due to their excellent properties. In this paper, a novel high performance flexible supercapacitor is reported. The carbon fibers surface-grown with helical carbon nanotubes (CF-HCNTs) are prepared using chemical vapor deposition and then combined with PANI by in-situ polymerization to form a 3D porous structure. The carbon fibers surface-grown with helical carbon nanotubes and polyaniline (CF-HCNTs-PANI) flexible supercapacitor electrodes exhibit a high capacitance of 660 F/g at a current density of 1 A/g with good cycling stability (90.4% capacitance retention after 1000 charge/discharge cycles) and low interfacial charge-transfer resistance of 0.5 Ω. These excellent electrochemical performances are attributed to faradic pseudocapacity, large surface area, 3D porous structure of the CF-HCNTs-PANI electrodes and unique multi-scale fibrous materials. Furthermore, the all-solid-state CF-HCNTs-PANI flexible supercapacitor shows a good specific capacitance of 439 F/g at a current density of 0.05 A/g and has excellent deformation stability. Its electrochemical performance does not cause obvious effect after bending and twisting (95.4% capacitance retention after 500 bending/recovery cycles and near no change after twisting). The CF-HCNTs-PANI electrode with the unique nanostructure will play an important role in the preparation of flexible supercapacitors.

中文翻译：

---

用螺旋碳纳米管和聚苯胺表面生长的碳纤维，用于高性能电极材料和柔性超级电容器

摘要 碳纤维基柔性超级电容器因其优异的性能而受到广泛关注。本文报道了一种新型高性能柔性超级电容器。使用化学气相沉积制备表面生长螺旋碳纳米管 (CF-HCNT) 的碳纤维，然后通过原位聚合与 PANI 结合形成 3D 多孔结构。用螺旋碳纳米管和聚苯胺 (CF-HCNTs-PANI) 柔性超级电容器电极表面生长的碳纤维在 1 A/g 的电流密度下表现出 660 F/g 的高电容，具有良好的循环稳定性（90.4% 的电容保持率1000 次充电/放电循环）和 0.5 Ω 的低界面电荷转移电阻。这些优异的电化学性能归功于法拉第赝容量、大表面积、CF-HCNTs-PANI 电极和独特的多尺度纤维材料的 3D 多孔结构。此外，全固态 CF-HCNTs-PANI 柔性超级电容器在 0.05 A/g 的电流密度下显示出 439 F/g 的良好比电容，并具有优异的变形稳定性。其电化学性能在弯曲和扭曲后不会产生明显影响（500次弯曲/恢复循环后电容保持率为95.4%，扭曲后几乎没有变化）。具有独特纳米结构的CF-HCNTs-PANI电极将在柔性超级电容器的制备中发挥重要作用。05 A/g，具有优异的变形稳定性。其电化学性能在弯曲和扭曲后不会产生明显影响（500次弯曲/恢复循环后电容保持率为95.4%，扭曲后几乎没有变化）。具有独特纳米结构的CF-HCNTs-PANI电极将在柔性超级电容器的制备中发挥重要作用。05 A/g，具有优异的变形稳定性。其电化学性能在弯曲和扭曲后不会产生明显影响（500次弯曲/恢复循环后电容保持率为95.4%，扭曲后几乎没有变化）。具有独特纳米结构的CF-HCNTs-PANI电极将在柔性超级电容器的制备中发挥重要作用。