Asymmetric supercapacitors based on SnNiCoS ternary metal sulfide electrodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Metal sulfides are widely studied for supercapacitor electrodes, but performance optimization is ongoing.
• Ternary metal sulfides offer potential for enhanced electrochemical properties due to synergistic effects.

Purpose of the Study:

• To synthesize and evaluate the ternary metal sulfide SnNiCoS as an electrode material for asymmetric supercapacitors.
• To compare the performance of SnNiCoS with single (CoS) and binary (NiCoS) metal sulfides.

Main Methods:

• Synthesis of nanospherical SnNiCoS, CoS, and NiCoS.
• Fabrication of asymmetric supercapacitors using the synthesized sulfides and active carbon.
• Electrochemical characterization including specific capacitance, energy density, power density, and cycling stability.

Main Results:

• Nanospherical SnNiCoS exhibited the best performance among the tested materials.
• Specific capacitance of 18.6 F cm⁻² at 5 mA·cm⁻² was achieved.
• High energy density of 937.2 μWh cm⁻² at a power density of 4000 μW·cm⁻² was recorded.
• Capacity retention of 82.9% after 8000 cycles was observed.

Conclusions:

• Ternary metal sulfides like SnNiCoS provide enhanced redox activity through synergistic effects of multiple transition metals.
• SnNiCoS is a promising electrode material for developing high-performance asymmetric supercapacitors.
• The developed material shows potential for advanced energy storage applications.