Heterogeneous MoS ₂ Nanosheets on Porous TiO ₂ Nanofibers toward Fast and Reversible Sodium‐Ion Storage

Abstract 2D layered molybdenum disulfide (MoS ₂ ) 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 MoS ₂ nanosheets decorated porous TiO ₂ nanofibers (MoS ₂ NSs@TiO ₂ NFs) with rich oxygen vacancies are engineered by microemulsion electrospinning method and subsequent hydrothermal/heat treatment. The MoS ₂ NSs@TiO ₂ 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 Na ₃ V ₂ (PO ₄ ) 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.