Bamboo-Based Mesoporous Activated Carbon for High-Power-Density Electric Double-Layer Capacitors

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Electric double-layer capacitors (EDLCs) are crucial for energy storage but are limited by activated carbon electrode materials with insufficient output characteristics.
• Commercial activated carbon, derived from coconut shells, possesses a microporous structure unsuitable for optimal EDLC performance.

Purpose of the Study:

• To develop a high-performance, mesoporous activated carbon electrode material for EDLCs.
• To utilize an environmentally friendly and readily available resource, bamboo, for activated carbon production.

Main Methods:

• Mesoporous activated carbon (PB-AC) was synthesized from bamboo using phosphoric acid and steam activation.
• The structural and textural properties of PB-AC were analyzed, focusing on specific surface area and mesopore volume.
• PB-AC was tested as an electrode material in EDLCs.

Main Results:

• PB-AC exhibited a high specific surface area (960-2700 m²/g) and a significant mesopore volume ratio (7.5-44.5%).
• The phosphoric acid treatment was key to achieving the desired high surface area and mesoporous structure.
• The PB-AC electrode demonstrated a specific capacitance of 86.7 F/g, a 35% improvement over commercial YP-50F.

Conclusions:

• Bamboo is a viable and sustainable precursor for producing high-performance activated carbon for EDLC electrodes.
• The developed PB-AC material significantly enhances the energy storage capabilities of EDLCs.