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High-efficiency thermal-electromagnetic synergistic resistance enabled by hierarchical phase change materials
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DOI：10.1016/j.jechem.2026.07.078.png)
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Abstract
En 中文
The relentless drive toward miniaturization and high-power-density in modern electronic systems has given rise to two intertwined challenges: localized thermal shock and multifrequency electromagnetic interference. These coexisting issues critically undermine device operational stability, thermal reliability, and long-term durability. Herein, we propose a hierarchical heterostructure engineering approach to prepare composite phase change materials (PCMs) that concurrently enables high-efficiency thermal-electromagnetic synergistic resistance. A hierarchical interconnected 3D conductive network is constructed through in situ growth of vertically oriented MoS2 nanosheets on MOF-on-MOF-derived Co-embedded graphitic carbon nanocage (Co-GC/NC), creating abundant adsorption sites for paraffin wax (PW) infiltration and efficient channels for electromagnetic dissipation. The obtained PW-MoS2@Co-GC/NC integrates a high phase change enthalpy of 129.62 J g−1, and exceptional cyclic stability, with negligible enthalpy degradation after long-term thermal cycling, enabling stable transient thermal buffering to suppress rapid temperature fluctuations in electronic modules. In electromagnetic resistance, vertically aligned MoS2 and Co-GC/NC nanocage synergistically optimize impedance matching at the air-material interface, while activating a collaborative dissipation mechanism dominated by interfacial polarization, supplemented by conductive loss, dipole relaxation, and multiple scattering. This unique mechanism endows PW-MoS2@Co-GC/NC with ultrahigh microwave absorption: a minimum reflection loss of −70.07 dB and an effective absorption bandwidth of 5.26 GHz. Device-level experiments and electromagnetic simulations further validate its practical potential for simultaneous thermal management and EMI suppression. This hierarchical solution provides insights for designing next-generation composite PCMs for intelligent thermal management and electromagnetic protection.
Keywords:
Phase change materials
Metal-organic frameworks
Molybdenum disulfide
Hierarchical heterostructure
Thermalmanagement
Microwaveabsorption
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