Facile Synthesis and Optimization of CrOOH/rGO-Based Electrode Material for a Highly Efficient Supercapacitor Device

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitors are crucial for energy storage, driving research into novel electrode materials.
• Precise control over material composition is vital for industrial-scale supercapacitor manufacturing.

Purpose of the Study:

• To synthesize chromium oxyhydroxide (CrOOH) nanoparticles and explore their composites with reduced graphene oxide (rGO) for supercapacitor applications.
• To optimize the CrOOH:rGO ratio for enhanced electrochemical performance in coin cell supercapacitors.

Main Methods:

• Reduced graphene oxide (rGO) synthesized via modified Hummer's method and ascorbic acid reduction.
• Ultrasmall CrOOH nanoparticles (3-10 nm) prepared through hydrothermal treatment.
• Six CrOOH/rGO composites fabricated with varying compositions for electrode fabrication.

Main Results:

• The 70% CrOOH/30% rGO composite demonstrated the highest specific capacitance (199.8 mF cm⁻²).
• Excellent cyclic stability was observed for the optimized composite over 10,000 charge/discharge cycles.
• The supercapacitor device achieved high energy (8.26 Wh kg⁻¹) and power density (3756.9 W kg⁻¹).

Conclusions:

• A facile synthesis route for CrOOH nanoparticles was established.
• The optimized CrOOH/rGO composite shows significant promise as a high-performance electrode material for supercapacitors.
• The study highlights the commercial viability of these advanced energy-storage materials.