Graphene fiber-based supercapacitors hold great promise as flexible energy-storage devices. However, simultaneously achieving high ion-transport ability in electrode and electrolyte layer, which is crucial for realizing the high electrochemical performance, still remains challenging. Here, a facile and effective strategy to solve the problem was proposed by developing a twisting-structured graphene/carbon nanotube (CNT) fiber supercapacitor via one-step wet-spinning process with customized multi-channel spinneret. The remarkable structure features of the resulting fiber supercapacitor with wrinkled and thin electrolyte layer, and well-developed porosity of fiber electrode favored the rapid infiltration and transport of electrolyte ions inside the electrode, as well as between electrode and electrolyte, thus boosting high specific capacitance of 187.6 mF cm⁻² and energy density of 30.2 µWh cm⁻², and featuring long cycling life (93% capacitance retention after 10,000 cycles) and excellent flexibility. Moreover, the specific capacitance and energy density could be further improved to 267.2 mF cm⁻² and 66.8 µWh cm⁻², respectively, when MnO₂ was incorporated into the fiber.

石墨烯纤维基超级电容器作为灵活的储能设备具有广阔的前景。然而，在电极和电解质层中同时实现高离子传输能力，这对于实现高电化学性能至关重要，仍然具有挑战性。在此，通过定制多通道喷丝头的一步湿纺工艺开发了一种加捻结构的石墨烯/碳纳米管（CNT）纤维超级电容器，提出了一种解决该问题的简便有效的策略。所得的具有皱褶和薄电解质层的纤维超级电容器的显着结构特征以及纤维电极的良好孔隙率有利于电解质离子在电极内部以及电极与电解质之间的快速渗透和传输，^-2和30.2 µWh cm ^-2的能量密度，并具有长循环寿命（10,000次循环后93％的电容保持率）和出色的柔韧性。此外，比电容和能量密度可进一步提高到267.2 mF及其厘米^-2和66.8μWh厘米^-2，分别当的MnO ₂被编入纤维。