C@TiO 2 /MoO 3 Composite Nanofibers with 1T‐Phase MoS 2 Nanograin Dopant and Stabilized Interfaces as Anodes for Li‐ and Na‐Ion Batteries

Integrating layered nanostructured MoS 2 with a structurally stable TiO 2 backbone to construct reciprocal MoS 2 /TiO 2 ‐based nanocomposites is an effective strategy. C@TiO 2 /MoO 3 composite nanofibers doped with 1T‐phase MoS 2 nanograins were fabricated by partially sulfurizing MoO x /TiO 2 precursors. By controlling a suitable preoxidation temperature before severe thermolysis of polyvinylpyrrolidone (PVP), the MoO x /TiO 2 precursors formed a polymer‐embedded array through coordination of the Mo source and pyrrolidyl groups of PVP. Sulfidation under water/solvent hydrothermal conditions led to partial formation of metallic 1T‐phase MoS 2 from the MoO x precursor with preoxidation at 200 °C. After carbonization, the TiO 2 /MoO 3 /MoS 2 nanograins were encapsulated in a carbon backbone in a vertical pattern, providing both chemical contact for confined electron transport and sufficient space to adapt to volume changes. The obtained carbon‐based platform not only has the advantages of an integral structure, but also exhibited ultrastable specific capacities of 540 and 251 mAh g −1 for Li‐ion batteries and Na‐ion batteries, respectively, after 100 cycles.