Electron-Injection-Engineering Induced Phase Transition toward Stabilized 1T-MoS₂ with Extraordinary Sodium Storage...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Phase transition engineering is crucial for modifying material properties, particularly for achieving the metastable 1T-MoS₂ phase.
• Previous methods for large-scale 1T-MoS₂ fabrication faced challenges with complex conditions and low yields.
• Achieving stable and high-yield 1T-MoS₂ is essential for advanced energy storage applications.

Purpose of the Study:

• To develop a facile and scalable strategy for fabricating 1T-MoS₂.
• To engineer a composite material (TiO-1T-MoS₂ NFs) with enhanced properties for sodium-ion batteries.
• To elucidate the mechanism behind the phase transition and the composite's performance.

Main Methods:

• Utilized an electron injection strategy for phase transition engineering of MoS₂.
• Fabricated a composite of conductive TiO chemically bonded to 1T-MoS₂ nanoflowers (TiO-1T-MoS₂ NFs) on a large scale.
• Analyzed the electronic structure changes and material properties using advanced characterization techniques.

Main Results:

• Achieved a 100% phase transition from 2H-MoS₂ to 1T-MoS₂ via electron injection, triggered by Mo 4d orbital reorganization.
• The TiO-1T-MoS₂ NFs composite exhibited higher electronic conductivity, reduced Na⁺ diffusion barrier, and suppressed sulfur release compared to 2H-MoS₂.
• Demonstrated excellent rate capability (650/288 mAh g^-1 at 50/20,000 mA g^-1) and cycling stability (501 mAh g^-1 at 1000 mA g^-1 after 700 cycles) in sodium-ion batteries.

Conclusions:

• The facile electron injection strategy enables scalable production of high-quality 1T-MoS₂.
• The conductive TiO bonding effectively stabilizes the 1T phase, overcoming previous limitations.
• This approach provides a valuable reference for designing advanced materials for energy storage and other applications.