Asymmetric polyhedron structured NiSe₂@MoSe₂ device for use as a supercapacitor

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Supercapacitors are crucial energy storage devices requiring advanced electrode materials.
• Developing materials with high surface area and accessible redox sites is key for enhanced performance.
• Nickel and Molybdenum selenides offer potential due to their unique electrochemical properties.

Purpose of the Study:

• To synthesize and characterize polyhedron-structured NiSe₂@MoSe₂ (NMS) composite.
• To evaluate the electrochemical performance of NMS as a supercapacitor electrode.
• To investigate the synergistic effects of Ni and Mo ions on electrochemical activity.

Main Methods:

• Hydrothermal synthesis method for producing NMS composite.
• Structural and morphological characterization using techniques like Laser Raman spectroscopy.
• Electrochemical testing in a 1 M KOH electrolyte for supercapacitor performance evaluation.

Main Results:

• NMS composite exhibited a maximum specific capacitance of 1000 F g⁻¹ at 1 A g⁻¹.
• Achieved 77.67% capacity retention over 5000 cycles at 10 A g⁻¹.
• An asymmetric supercapacitor using NMS demonstrated 305 F g⁻¹ at 1 A g⁻¹ with 87.35% retention over 5000 cycles.

Conclusions:

• The polyhedron-structured NMS composite is a highly effective electrode material for supercapacitors.
• The combined Ni and Mo ions contribute to enhanced redox chemistry and electrochemical activity.
• NMS shows significant potential for high-performance energy storage applications.