Ultra-Wide Interlayered W_xMo_2xS_y Alloy Electrode Patterning through High-Precision Controllable Photonic-Synthesis

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Ultra-thin 2D materials offer promising channels for ion transport in micro-supercapacitors (MSCs).
• Developing efficient synthesis methods for 2D materials with tailored properties is crucial for enhancing energy storage performance.

Purpose of the Study:

• To develop a high-precision photonic-synthesis strategy for creating ultra-thin 2D alloyed WxMo2xSy films.
• To investigate the effects of alloying, sulfur vacancies, and interlayer expansion on the electrochemical performance of WxMo2xSy for MSCs.

Main Methods:

• Utilized a controllable photonic-synthesis strategy on a 1-inch wafer scale.
• Engineered WxMo2xSy films with sulfur vacancies and expanded interlayer spacing (13.2 Å) via picosecond/femtosecond scale nucleation and growth control.
• Fabricated and tested symmetric MSCs using the synthesized WxMo2xSy films.

Main Results:

• Achieved Mo-W alloying, significant interlayer expansion, and sulfur loss in WxMo2xSy films.
• Reduced diffusion barriers, enhancing charge transfer and ion diffusion kinetics.
• Demonstrated ultrahigh specific capacitance (242.57 mF cm⁻² and 242567.83 F cm⁻³) and energy density (21.56 Wh cm⁻³).

Conclusions:

• The photonic-synthesis strategy enables precise control over 2D material properties for energy applications.
• The resulting WxMo2xSy films are highly effective electrodes for high-performance MSCs.
• This universal synthesis approach can be applied to various materials for flexible microenergy device fabrication.