Morphology Regulation of CoMn‐MOF Derived Composites Anchored on Carbon Foam for Enhanced Microwave Absorption and Thermal Insulation Performance

ABSTRACT Magnetic porous carbon foams, with low density, strong attenuation, and improved impedance matching, have been introduced as effective microwave absorbers to combat electromagnetic interference. In this study, morphology regulation of CoMn‐MOF derived composites anchored on carbon foam were prepared by in situ growth and high‐temperature pyrolysis. The pyrolysis temperature significantly influences the structural and chemical properties of the magnetic carbon foams. At a matching thickness of 1.45 mm, the material yielded a wide absorption bandwidth of 4.46 GHz, along with a minimum reflection loss of −51.54 dB at 1.55 mm. The excellent microwave absorption properties were contributed to the conductive loss, dipole polarization, interfacial polarization, natural resonance, exchange resonance, and impedance matching. The prepared magnetic porous carbon foams also integrate thermal insulation property. This work established a promising design strategy for advanced microwave absorbers that combine low density with high absorption efficiency, broadband absorption capabilities, and thermal insulation properties.