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

• DOI: 10.1007/s40820-025-01652-0
• Publication Date: 2025-01-31T14:14:04Z
• Authors: Xuewen Han; Cheng Hao; Yukang Peng; Han Yu; Tao Zhang; Haonan Zhang; Kaiwen Chen; Heyu Chen; Zhenxing Wang; Ning Yan; Junwen Pu
• Keywords: Cellulose fiber

Abstract In an era where technological advancement and sustainability converge, developing renewable materials with multifunctional integration is increasingly in demand. This study filled a crucial gap by integrating energy storage, multi-band electromagnetic interference (EMI) shielding, structural design into bio-based materials. Specifically, conductive polymer layers were formed within the 2,2,6,6-tetramethylpiperidine-1-oxide (TEMPO)-oxidized cellulose fiber skeleton, mild TEMPO-mediated oxidation system was applied to endow it abundant macropores that could be utilized as active sites (specific surface area of 105.6 m 2 g −1 ). Benefiting from special hierarchical porous structure material, constructed fiber-derived composites can realize high areal-specific capacitance 12.44 F cm −2 at 5 mA areal density 3.99 mWh (2005 mW ) excellent stability maintaining 90.23% after 10,000 cycles 50 . Meanwhile, showed electrical conductivity 877.19 S EMI efficiency (> 99.99%) multiple wavelength bands. The composite material’s values exceed 100 dB across L, S, C, X bands, effectively shielding waves daily life. proposed strategy paves way for utilizing applications like storage contributing more sustainable future.