1T MoS2 nanograins doped C@TiO2/MoO3 composite nanofibers with stabilized interfaces as anodes for Li- and Na-ion batteries.

Integrating layered nanostructured MoS2 with superior structural stable TiO2 backbone to construct reciprocal MoS2-TiO2 based nanocomposites has been proved to be an effective strategy. Herein, 1T phase MoS2 nanograins doped C@TiO2/MoO3 composite nanofibers were achieved by partially sulfurizing MoOx/TiO2 precursors. Controlling the suitable preoxidation temperature before severe thermolysis of PVP, the TiO2/MoOx precursors appeared as array embedded into polymer induced by chemical coordination of Mo source and pyrrolidyl group of PVP. In particular, the sulfidation in water-solvent hydrothermal condition could be partly accessible to metallic 1T phase MoS2 from MoOx precursor with preoxidation at 200℃. After carbonization, the TiO2/MoO3/MoS2 nanograins were encapsulated into carbon backbone in vertical pattern, providing both the chemical contact of confined electron transport and sufficient space to adapt volume variation. The obtained carbon-based platform not only combined the advantages of the integral structure, but also exhibited the ultra-stable specific capacities of 540 and 251 mAh/g for Li-ion batteries and Na-ion batteries after 100 cycles.