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 H₂SO₄ 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.