Electron-Injection-Engineering Induced Phase Transition toward Stabilized 1T-MoS with Extraordinary Sodium Storage Performance.

Phase transition engineering, with the ability to alter the electronic structure and physicochemical properties of materials, has been widely used to achieve the thermodynamically unstable metallic phase MoS (1T-MoS), although the complex operating conditions and low yield of previous strategies make the large-scale fabrication of 1T-MoS a big challenge. Herein, we report a facile electron injection strategy for phase transition engineering and fabricate a composite of conductive TiO chemically bonded to 1T-MoS nanoflowers (TiO-1T-MoS NFs) on a large scale. The underlying mechanism analysis reveals that electron-injection-engineering triggers a reorganization of the Mo 4d orbitals and results in a 100% phase transition of MoS from 2H to 1T. In the TiO-1T-MoS NFs composite, the 1T-MoS demonstrates a higher electronic conductivity, a lower Na diffusion barrier, and a more restricted S release than 2H-MoS. In addition, conductive TiO bonding successfully resolves the stability challenge of the 1T phase. These merits endow TiO-1T-MoS NFs electrodes with an excellent rate capability (650/288 mAh g at 50/20 000 mA g, respectively) and an outstanding cyclability (501 mAh g at 1000 mA g after 700 cycles) in sodium ion batteries. Such an improvement signifies that this facile and scalable phase-transition engineering combined with a deep mechanism analysis offers an important reference for designing advanced materials for various applications.