Pecan Shell-Derived Activated Carbon for High-Electrochemical Performance Supercapacitor Electrode.

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Electric double-layer capacitors (EDLCs) using carbon nanomaterials offer high power and stability but suffer from low capacitance and inefficient activation.
• Existing methods for producing activated carbon are often complex and environmentally taxing, limiting supercapacitor applications.

Purpose of the Study:

• To develop a cost-effective and environmentally friendly method for producing high-performance activated carbon (AC).
• To synthesize novel AC from pecan shells (PS) using a single-step self-activation process.
• To evaluate the performance of supercapacitors fabricated with the synthesized AC.

Main Methods:

• A single-step self-activation process combining carbonization and activation was employed.
• Pecan shells were used as a precursor for activated carbon synthesis.
• Supercapacitors were fabricated using the synthesized pecan shell-derived activated carbon (PSAC) for electrochemical testing.

Main Results:

• The synthesized PSAC exhibited a high specific pore volume (0.744 cm³/g) and BET surface area (1554 m²/g).
• PSAC-based supercapacitors achieved a specific capacitance of 269 F/g at 2 A/g.
• The supercapacitors demonstrated excellent cycling stability (>15,000 cycles) and high energy/power densities (37.4 Wh/kg and 2.1 kW/kg).

Conclusions:

• The novel self-activation method provides an efficient route to produce high-performance activated carbon from pecan shells.
• The resulting PSAC is suitable for developing environmentally friendly and scalable supercapacitors.
• This approach addresses limitations of traditional AC production and enhances supercapacitor performance.