Combining suitable microstructure and dielectric-magnetic synergy effect is conducive to achieve lightweight, broadband, and high-efficiency microwave absorbing materials within low filler loading. Herein, porous carbon polyhedrons coupled with bimetallic CoNi alloys were synthesized by using metal-organic frameworks (MOFs) as a template and subsequent pyrolysis treatment. Electromagnetic analysis indicated that the existence of metal Ni element could influence the wave attenuation capacity effectively, resulting in frequency selective wave absorption performance. Additionally, the pyrolysis temperature was also closely related to wave absorption intensity. The Co₂Ni₁/C/PVDF composites calcined at 800 °C possessed outstanding wave absorption performance at an ultra-low filler loading of 5 wt%. The minimum reflection loss value achieved -52 dB (10.8 GHz) under the matched thickness of 3 mm. Moreover, the broadest effective absorption bandwidth (RL< -10 dB) reached 6.2 dB (11.8–18 GHz) for Co/C-800/PVDF composites when the thickness turned into 2 mm. The remarkable wave attenuation ability was mainly ascribed to magnetic and dielectric loss, impedance matching as well as porous structure effect.

结合合适的微观结构和介磁协同效应，有利于在低填料负载下实现轻质、宽带、高效的吸波材料。在此，通过使用金属有机骨架（MOF）作为模板和随后的热解处理合成了与双金属 CoNi 合金偶联的多孔碳多面体。电磁分析表明，金属Ni元素的存在可以有效地影响波衰减能力，从而导致频率选择波吸收性能。此外，热解温度也与波吸收强度密切相关。钴₂镍₁在 800 °C 下煅烧的 /C/PVDF 复合材料在 5 wt% 的超低填料负载下具有出色的吸波性能。在匹配厚度为 3 mm 的情况下，最小反射损耗值达到 -52 dB (10.8 GHz)。此外，当厚度变为 2 mm 时，Co/C-800/PVDF 复合材料的最宽有效吸收带宽 (RL< -10 dB) 达到 6.2 dB (11.8-18 GHz)。显着的波衰减能力主要归因于磁损耗和介电损耗、阻抗匹配以及多孔结构效应。