Heterogeneous MoS₂ Nanosheets on Porous TiO₂ Nanofibers toward Fast and Reversible Sodium-Ion Storage

2D layered molybdenum disulfide (MoS₂) has garnered considerable attention as an attractive electrode material in sodium-ion batteries (SIBs), but sluggish mass transfer kinetic and capacity fading make it suffer from inferior cycle capability. Herein, hierarchical MoS₂ nanosheets decorated porous TiO₂ nanofibers (MoS₂ NSs@TiO₂ NFs) with rich oxygen vacancies are engineered by microemulsion electrospinning method and subsequent hydrothermal/heat treatment. The MoS₂ NSs@TiO₂ NFs improves ion/electron transport kinetic and long-term cycling performance through distinctive porous structure and heterogeneous component. Consequently, the electrode exhibits excellent long-term Na storage capacity (298.4 mAh g⁻¹ at 5 A g⁻¹ over 1100 cycles and 235.6 mAh g⁻¹ at 10 A g⁻¹ over 7200 cycles). Employing Na₃V₂(PO₄)₃ as cathode, the full cell maintains a desirable capacity of 269.6 mAh g⁻¹ over 700 cycles at 1.0 A g⁻¹. The stepwise intercalation-conversion and insertion/extraction endows outstanding Na⁺ storage performance, which yields valuable insight into the advancement of fast-charging and long-cycle life SIBs anode materials.