Flow‐Regime‐Controlled Fabrication of CNT‐Bridged Vertically Aligned rGO/MXene Fibers for High‐Performance Fiber Supercapacitors

Abstract The directional construction of electrode frameworks aligned with the transport pathways of ions/electron is critical for electrochemical processes. However, conventional fabrication strategies suffer from bottlenecks such as complex processes, and difficulty in scaling up production. In this work, a flow‐driven wet‐spinning strategy is developed to fabricate carbon nanotube (CNT)‐bridged vertically aligned reduced graphene oxide (rGO)/MXene fibers (CNT‐VA‐GMFs). Enabled by precisely regulating of flow regimes, the vertical aligned rGO/MXene nanosheets and CNT‐bridged structure collaboratively establish open porous channels for rapid ion transport, continuous conductive networks for efficient electron transfer, and abundant accessible active sites for enhanced charge storage. Consequently, the CNT‐VA‐GMF electrode exhibits improved ion transport, exceptional specific capacitance (740 F g −1 ), and outstanding long‐term cycling stability (98% retention after 30 000 cycles) in H 2 SO 4 electrolyte. The assembled flexible asymmetric supercapacitor achieves a remarkable energy density of 224 Wh kg −1 (at 1200 W kg −1 ) while maintaining robust mechanical flexibility.