Willow Bark for Sustainable Energy Storage Systems

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Willow bark is an abundant, underutilized forestry byproduct.
• Developing sustainable electrode materials is crucial for advanced energy storage devices.
• Supercapacitors offer high power density but require efficient electrode materials.

Purpose of the Study:

• To upcycle willow bark into high-performance electrode materials for supercapacitors.
• To investigate the effect of KOH activation protocols on material properties.
• To evaluate the electrochemical performance of derived materials in organic electrolytes.

Main Methods:

• A two-step procedure involving pre-treatment and carbonization of willow bark.
• Utilizing various potassium hydroxide (KOH) activation protocols.
• Fabrication and testing of symmetrical supercapacitors with organic electrolytes.

Main Results:

• Hierarchically porous carbon materials with high specific surface area (>2500 m² g⁻¹) and pore volume (up to 1.48 cm³ g⁻¹).
• Supercapacitors achieved capacitances up to 147 F g⁻¹ in organic electrolytes.
• Demonstrated excellent cycling stability over 10,000 cycles with 75% capacity retention at high scan rates.

Conclusions:

• Willow bark can be effectively converted into sustainable, high-performance electrode materials.
• The developed materials show significant potential for use in advanced symmetrical supercapacitors.
• This upcycling approach offers an eco-friendly route to valuable energy storage components.