Preparation of capacitor's electrode from sunflower seed shell

Area of Science:

• Materials Science
• Electrochemistry
• Carbon Materials

Background:

• Nanoporous carbons are crucial for energy storage devices like electrochemical double-layer capacitors (EDLCs).
• Developing cost-effective and high-performance electrode materials from biomass is an active area of research.
• Sunflower seed shell (SSS) is an abundant agricultural waste with potential for carbon material synthesis.

Purpose of the Study:

• To synthesize nanoporous carbons from sunflower seed shells (SSS) using two distinct methods.
• To evaluate these carbons as electrode materials for EDLCs.
• To investigate the influence of synthesis parameters on pore structure and electrochemical performance.

Main Methods:

• Two preparation strategies: carbonization-activation and impregnation-activation.
• Characterization of surface area and pore structure using N2 adsorption.
• Electrochemical performance evaluation in EDLCs, including capacitance and rate capability.

Main Results:

• Pore structure is significantly influenced by activation temperature and KOH dosage.
• Impregnation-activation yielded carbons with superior capacitive behavior and capacitance retention.
• The synthesized carbons outperformed ordered mesoporous carbons and commercial activated carbon.

Conclusions:

• SSS is a viable precursor for high-performance EDLC electrode materials.
• The impregnation-activation method is more effective for creating advantageous pore structures.
• The developed nanoporous carbons offer a promising, sustainable alternative for energy storage applications.