Durable ZrB₂-ZrC Composite Materials as Advanced Electrodes for High-Performance Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Boride and carbide materials are gaining traction for energy storage.
• Zirconium diboride (ZrB2) and zirconium carbide (ZrC) are promising candidates.

Purpose of the Study:

• Synthesize pure ZrB2, ZrC, and their composite powders.
• Evaluate their performance as electrodes in supercapacitors.

Main Methods:

• Mechanical activation-assisted synthesis route.
• Subsequent heating processes for powder preparation.
• Characterization of chemical and microstructural properties.
• Fabrication and testing of supercapacitor devices with symmetrical electrodes.

Main Results:

• Synthesized high-purity composite powders with submicron particle sizes (<400 nm) and high surface area (up to 9.41 m²/g).
• Supercapacitors achieved high energy densities (5.8–8.8 Wh/kg).
• ZrB2-15 wt% ZrC composite exhibited superior power density (155 W/kg) compared to pure ZrB2 (118 W/kg).
• Exceptional capacitance retention (99.4–99.9%) and cyclic stability over 5000 cycles were observed.

Conclusions:

• ZrB2-ZrC composites demonstrate excellent electrochemical performance for supercapacitors.
• The materials exhibit high energy and power densities with remarkable durability.
• These composites are strong candidates for high-performance energy storage devices.