Abstract Graphene fiber-based electrodes for supercapacitors are promising candidates for wearable energy storage. Their main limitation, although, is the low electrochemical performance caused by the restacking of graphene sheets and their hydrophobicity to electrolytes. Incorporation of nanofillers into graphene is an efficient way to overcome the challenges, however, often leading to a severe deterioration in their mechanical property and/or conductivity, thus significantly influences the practical applications and rate performance of the device. Herein, an approach of fabricating hybrid fibers from graphene oxide (GO) and cellulose nanocrystal (CNC) via non-liquid-crystal spinning and followed by chemical reduction is presented to collectively work around the problems. The resultant hybrid GO/CNC fibers demonstrated a high capacitive performance, enhanced mechanical property, and improved hydrophilicity simultaneously. Furthermore, the conductivity kept at a high value. Sample with a GO/CNC weight ratio of 100/20 possessed a high capacitance of 208.2 F cm−3, a strength of 199.8 MPa, a contact angle of 63.3°, and conductivity of 64.7 S cm−1. Moreover, the supercapacitor assembled from this fiber exhibited a high energy density and power density (5.1 mW h cm−3 and 496.4 mW cm−3), excellent flexibility and bending stability, which has a great potential for use as a flexible power storage.

中文翻译：

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具有高电容性能和导电性的坚固、亲水的石墨烯/纤维素纳米晶纤维基电极

摘要 用于超级电容器的石墨烯纤维电极是可穿戴储能的有前途的候选者。然而，它们的主要限制是由石墨烯片的重新堆叠及其对电解质的疏水性引起的低电化学性能。将纳米填料掺入石墨烯是克服这些挑战的有效方法，但通常会导致其机械性能和/或导电性严重恶化，从而显着影响器件的实际应用和倍率性能。在此，提出了一种通过非液晶纺丝和化学还原由氧化石墨烯 (GO) 和纤维素纳米晶 (CNC) 制造混合纤维的方法，以共同解决这些问题。所得混合 GO/CNC 纤维同时表现出高电容性能、增强的机械性能和改善的亲水性。此外，电导率保持在高值。GO/CNC 重量比为 100/20 的样品具有 208.2 F cm-3 的高电容、199.8 MPa 的强度、63.3° 的接触角和 64.7 S cm-1 的电导率。此外，由这种纤维组装而成的超级电容器具有高能量密度和功率密度（5.1 mW h cm-3 和 496.4 mW cm-3）、优异的柔韧性和弯曲稳定性，具有作为柔性储能的巨大潜力。强度为 199.8 MPa，接触角为 63.3°，电导率为 64.7 S cm-1。此外，由这种纤维组装而成的超级电容器具有高能量密度和功率密度（5.1 mW h cm-3 和 496.4 mW cm-3）、优异的柔韧性和弯曲稳定性，具有作为柔性储能的巨大潜力。强度为 199.8 MPa，接触角为 63.3°，电导率为 64.7 S cm-1。此外，由这种纤维组装而成的超级电容器具有高能量密度和功率密度（5.1 mW h cm-3 和 496.4 mW cm-3）、优异的柔韧性和弯曲稳定性，具有作为柔性储能的巨大潜力。