Novel Cellulosic Fiber Composites with Integrated Multi-Band Electromagnetic Interference Shielding and Energy...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Growing demand for sustainable, multifunctional materials.
• Need for advanced solutions in energy storage and electromagnetic interference (EMI) shielding.
• Limited development of bio-based materials for these integrated applications.

Purpose of the Study:

• To create bio-based materials with integrated energy storage and multi-band EMI shielding capabilities.
• To utilize a TEMPO-oxidized cellulose fiber skeleton for structural and functional enhancement.
• To explore the potential of these composites in sustainable technological applications.

Main Methods:

• Fabrication of cellulose fiber composites using TEMPO-mediated oxidation.
• Incorporation of conductive polymer layers within the cellulose fiber skeleton.
• Characterization of material properties including specific surface area, capacitance, energy density, electrical conductivity, and EMI shielding effectiveness.

Main Results:

• Achieved a hierarchical porous structure with a specific surface area of 105.6 m² g⁻¹.
• Demonstrated high areal-specific capacitance (12.44 F cm⁻²) and areal energy density (3.99 mWh cm⁻²).
• Exhibited excellent electrochemical stability (90.23% retention after 10,000 cycles) and high electrical conductivity (877.19 S m⁻¹).
• Attained over 99.99% EMI shielding efficiency across L, S, C, and X bands ( >100 dB).

Conclusions:

• The developed cellulose fiber-derived composites successfully integrate energy storage and multi-band EMI shielding.
• The hierarchical porous structure and conductive polymer integration are key to the material's performance.
• This bio-based approach offers a sustainable pathway for advanced material applications in energy and electronics.