Optimizing the supercapacitive performance of MoS₂ by multivalent tungsten ion doping

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Molybdenum disulfide (MoS₂) is a promising material for energy storage.
• Enhancing the electrochemical performance of MoS₂ is crucial for supercapacitor applications.

Purpose of the Study:

• To investigate the impact of tungsten (W) doping on MoS₂ structure and supercapacitor performance.
• To explore W-doped MoS₂ nanoflowers as electrode materials for symmetric supercapacitors.

Main Methods:

• Synthesis of MoS₂ nanoflowers with varying W content (0-1%) via hydrothermal method.
• Characterization using XRD, Raman, PL, EPR, SEM, and BET analysis.
• Electrochemical performance evaluation in symmetric supercapacitor devices.

Main Results:

• Tungsten incorporation induced lattice distortions and sulfur vacancies in MoS₂.
• The MoS₂:W0.7 electrode exhibited the highest specific capacitance (848 F g^-1 at 10 mV s^-1).
• Achieved high energy density (117.8 Wh kg^-1) and power density (2121 W kg^-1) with 97% capacitance retention.

Conclusions:

• W doping enhances charge transport and introduces additional electroactive sites in MoS₂.
• W-doped MoS₂ demonstrates improved conductivity and energy storage capability.
• This study presents a simple and effective method to boost MoS₂ performance for supercapacitors.