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<p>Metal organic frameworks (MOFs) have been widely studied as materials for electromagnetic wave absorption (EMWA) owing to their high porosity and large surface area. However, it remains challenging to prepare MOF-derived composites with superior EMWA performance by a facile method. This work reports a simple method for producing carbon-rich, porous CoFe/C composites. It is achieved by annealing CoFe-MOF precursors with a 1:1 molar ratio at temperatures from 600 to 900&#xa0;°C under a nitrogen atmosphere. The annealing temperature allows the microstructure of samples to be regulated with precision. Specifically, annealing at 800&#xa0;°C promotes the formation of a hierarchical porous carbon skeleton with moderate CoFe nanoparticle agglomeration, which facilitates conductive network construction and interfacial polarization. The resulting composite achieves a minimum reflection loss of −60.31&#xa0;dB at a thickness of 2.78&#xa0;mm, as well as an effective absorption bandwidth of 4.72&#xa0;GHz at a thickness of 2.42&#xa0;mm with low filler loading of 10 wt%. This work provides a facile and scalable strategy for the design of MOF-derived bimetallic alloy/carbon composites while demonstrating a rational design strategy for high-performance EMWA materials.</p>

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Facile synthesis of MOF-derived CoFe/C composites for efficient electromagnetic wave absorption

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Xiyue Zhang,
  • Anze Shui,
  • Keru Song,
  • Quanyue Wen,
  • Hulei Yu

摘要

Metal organic frameworks (MOFs) have been widely studied as materials for electromagnetic wave absorption (EMWA) owing to their high porosity and large surface area. However, it remains challenging to prepare MOF-derived composites with superior EMWA performance by a facile method. This work reports a simple method for producing carbon-rich, porous CoFe/C composites. It is achieved by annealing CoFe-MOF precursors with a 1:1 molar ratio at temperatures from 600 to 900 °C under a nitrogen atmosphere. The annealing temperature allows the microstructure of samples to be regulated with precision. Specifically, annealing at 800 °C promotes the formation of a hierarchical porous carbon skeleton with moderate CoFe nanoparticle agglomeration, which facilitates conductive network construction and interfacial polarization. The resulting composite achieves a minimum reflection loss of −60.31 dB at a thickness of 2.78 mm, as well as an effective absorption bandwidth of 4.72 GHz at a thickness of 2.42 mm with low filler loading of 10 wt%. This work provides a facile and scalable strategy for the design of MOF-derived bimetallic alloy/carbon composites while demonstrating a rational design strategy for high-performance EMWA materials.