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<p>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, and 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, where a mild TEMPO-mediated oxidation system was applied to endow it with abundant macropores that could be utilized as active sites (specific surface area of 105.6 m<sup>2</sup>&#xa0;g<sup>−1</sup>). Benefiting from the special hierarchical porous structure of the material, the constructed cellulose fiber-derived composites can realize high areal-specific capacitance of 12.44 F cm<sup>−2</sup> at 5&#xa0;mA&#xa0;cm<sup>−2</sup> and areal energy density of 3.99 mWh cm<sup>−2</sup> (2005 mW cm<sup>−2</sup>) with an excellent stability of maintaining 90.23% after 10,000 cycles at 50&#xa0;mA&#xa0;cm<sup>−2</sup>. Meanwhile, the composites showed a high electrical conductivity of 877.19 S m<sup>−1</sup> and excellent EMI efficiency (&gt; 99.99%) in multiple wavelength bands. The composite material’s EMI values exceed 100&#xa0;dB across the L, S, C, and X bands, effectively shielding electromagnetic waves in daily life. The proposed strategy paves the way for utilizing bio-based materials in applications like energy storage and EMI shielding, contributing to a more sustainable future.</p>

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

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月31日

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  • Xuewen Han,
  • Cheng Hao,
  • Yukang Peng,
  • Han Yu,
  • Tao Zhang,
  • Haonan Zhang,
  • Kaiwen Chen,
  • Heyu Chen,
  • Zhenxing Wang,
  • Ning Yan,
  • Junwen Pu

摘要

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, and 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, where a mild TEMPO-mediated oxidation system was applied to endow it with abundant macropores that could be utilized as active sites (specific surface area of 105.6 m2 g−1). Benefiting from the special hierarchical porous structure of the material, the constructed cellulose fiber-derived composites can realize high areal-specific capacitance of 12.44 F cm−2 at 5 mA cm−2 and areal energy density of 3.99 mWh cm−2 (2005 mW cm−2) with an excellent stability of maintaining 90.23% after 10,000 cycles at 50 mA cm−2. Meanwhile, the composites showed a high electrical conductivity of 877.19 S m−1 and excellent EMI efficiency (> 99.99%) in multiple wavelength bands. The composite material’s EMI values exceed 100 dB across the L, S, C, and X bands, effectively shielding electromagnetic waves in daily life. The proposed strategy paves the way for utilizing bio-based materials in applications like energy storage and EMI shielding, contributing to a more sustainable future.