Distorted 2H/1T MoS2 nanostructures with improved field emission and sodium-ion battery performance
Ujjwala Chothe1, Priyanka Sumbe2, Mahendra A More2
1Dr. Vishwanath Karad MIT World Peace University (MIT-WPU) Kothrud Pune 411038 Maharashtra India k.ujjwala@yahoo.com bbkale1@gmail.com.
Nanoscale Advances
|May 14, 2025
Summary
This study presents a simple solid-state synthesis for molybdenum disulfide (MoS₂) phases. The metallic 1T-MoS₂ shows enhanced electrical conductivity for field electron emission and superior performance as an anode in sodium-ion batteries (SIBs).
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Molybdenum disulfide (MoS₂) exists in semiconducting (2H) and metallic (1T) phases, with distinct properties influencing applications.
- Developing scalable synthesis methods for specific MoS₂ phases is crucial for advanced electronic and energy storage devices.
- The intrinsic properties of MoS₂ phases, particularly the 1T phase, offer potential for improved conductivity and electrochemical activity.
Purpose of the Study:
- To develop a facile and scalable solid-state synthesis for both 2H and 1T phases of MoS₂.
- To investigate the structural and phase transition properties of MoS₂ synthesized via this method.
- To evaluate the performance of the synthesized MoS₂ phases in field electron emission and as anodes for sodium-ion batteries (SIBs).
Main Methods:
- Solid-state synthesis method utilizing thiourea concentration to control MoS₂ phase formation.
- X-ray Diffraction (XRD) and Raman spectroscopy for structural and phase characterization.
- Field electron emission (FEE) measurements at a base pressure of 1 × 10⁻⁸ mbar.
- Electrochemical testing of MoS₂ as an anode material for SIBs using glyme electrolytes.
Main Results:
- Successful synthesis of 2H and 1T phases of MoS₂ with distorted octahedral coordination.
- 1T-MoS₂ exhibited enhanced electrical conductivity due to ultrathin monolayer formation.
- 1T-MoS₂ achieved a higher emission current density (820 μA cm⁻²) in FEE compared to 2H-MoS₂ (542 μA cm⁻²).
- 1T-MoS₂ delivered a reversible capacity of 870 mA h g⁻¹ for SIBs, with 81% capacity retention after 300 cycles at 200 mA g⁻¹.
- Synergistic effects with glyme electrolytes enhanced SIB electrochemical performance.
Conclusions:
- The solid-state method provides a scalable route to synthesize MoS₂ phases with tunable properties.
- The active 1T-MoS₂ basal plane is key to its superior performance in both field electron emission and SIB applications.
- Unmodified MoS₂ demonstrates significant potential for revolutionizing electronic devices and energy storage technologies.
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