Sodium ion capacitors (SICs) have attracted extensive attention due to their combination of high-power electric-double-layer capacitors (EDLCs) and high-energy sodium ion batteries (SIBs). However, development of high-performance SIHCs has been plagued by the lack of superior Na⁺-storage anode materials to couple with the activated carbon (AC) cathode. In this work, we have prepared a sulfur-enriched self-supported TiO₂/C nanofiber membrane using a simple and scalable electrospinning technique. In such S-TiO₂/C structure, sulfur atoms (13%) are covalently linked with TiO₂ nanodots (5–10 nm), which are homogeneously embedded in highly conductive N-doped carbon nanofibers. Chemically bonded sulfur can not only provide additional faradaic pseudocapacitance but also show robust structural stability. In terms of sodium storage performance, the as-made S-TiO₂/C electrode exhibits high reversible capacity (410 mAh g^‒1 at 0.1 A g^‒1), high rate capability (173 mAh g^‒1 at 15 A g^‒1), and ultralong cycle life (no capacity degradation after 10000 cycles). When coupling with the AC cathode, the SIC full cell is capable of delivering high energy and power densities as well as long cycle life.

钠离子电容器（SIC）由于结合了高功率双电层电容器（EDLC）和高能钠离子电池（SIB）而受到广泛关注。然而，高性能 SIHC 的开发一直受到缺乏与活性炭 (AC) 阴极耦合的优质 Na ^{+ 存储}阳极材料的困扰。在这项工作中，我们使用简单且可扩展的静电纺丝技术制备了富硫自支撑 TiO ₂ /C 纳米纤维膜。在这种 S-TiO ₂ /C 结构中，硫原子 (13%) 与 TiO ₂共价连接纳米点（5-10 nm），它们均匀地嵌入高导电性的 N 掺杂碳纳米纤维中。化学键合的硫不仅可以提供额外的法拉第赝电容，而且还表现出强大的结构稳定性。在储钠性能方面，制成的 S-TiO ₂ /C 电极具有高可逆容量（410 mAh g ^‒1 at 0.1 A g ^‒1）、高倍率容量（173 mAh g ^‒1 at 15 A g ^{‒ 1} )、超长循环寿命（10000次循环后容量无衰减）。当与交流阴极耦合时，碳化硅全电池能够提供高能量和功率密度以及长循环寿命。