Celery-derived porous carbon materials for superior performance supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Supercapacitors are crucial for next-generation energy storage due to their high energy output, long cycle life, and use of sustainable materials.
• Developing efficient and eco-friendly materials for supercapacitors is an ongoing research challenge.

Purpose of the Study:

• To synthesize hierarchically porous carbon materials from celery biomass for high-performance supercapacitors.
• To evaluate the electrochemical properties of these materials in high-voltage, high-energy, and high-power applications.

Main Methods:

• Facile, low-cost pyrolysis and activation of celery biomass.
• Characterization of porous carbon materials, including surface area and heteroatom content.
• Electrochemical testing of supercapacitors in aqueous electrolytes.

Main Results:

• Synthesized carbon materials exhibit a high surface area (1612 m² g⁻¹) with nitrogen and phosphorus heteroatoms.
• Achieved a specific capacitance of 1002.80 F g⁻¹ at 1 A g⁻¹ and 95.6% capacitance retention after 10,000 cycles.
• Assembled symmetric cells demonstrated a high energy density of 32.7 Wh kg⁻¹ at 1200 W kg⁻¹ with minimal degradation.

Conclusions:

• Celery-derived porous carbon materials offer outstanding electrochemical performance for supercapacitors.
• This study highlights a sustainable and cost-effective method for producing advanced energy storage materials.
• The developed materials are promising for high-performance, green supercapacitor applications.