Metal organic frameworks (MOFs) attract more research in electromagnetic wave absorption due to their special microstructure. However, the micro/nano pore structure is not conducive to electromagnetic wave (EMW) entering the materials. Herein, three-dimensional ZnOCo@C with submillimeter porous structure are prepared by one-step thermal expansion of MOFs. Co is introduced into the preparation of zinc-based MOFs for co-coordination, thus ZnOCo heterogeneous interface is constructed. Therefore, the synergistic effect of magnetic loss and dielectric loss enhances microwave absorption performance of ZnOCo@C. Through heterogeneous interface construction and structural regulation, ZnOCo@C exhibits an ultra-width effective absorption band of 6.12 GHz, and the minimum reflection loss reaches −46.77 dB at 8.9 GHz. The results show that the existence of submillimeter hole structure is conducive to the entry of GHz electromagnetic wave, and the synergistic effect with ZnOCo heterostructure enhances the electromagnetic wave loss of ZnOCo@C. In addition, radar cross simulation can be reduced to 24.36 dB m² and the RCS value is completely lower than −16.32 dB m² in the range of −70° to 70°. This work provides a novel idea for the structural design and composition adjustment of MOFs-based EMW absorbing materials.

金属有机框架（MOFs）由于其特殊的微观结构而吸引了更多关于电磁波吸收的研究。然而，微/纳米孔结构不利于电磁波（EMW）进入材料。在此，通过 MOF 的一步热膨胀制备具有亚毫米多孔结构的三维 ZnOCo@C。Co被引入到锌基MOFs的制备中进行配位，从而构建了ZnOCo异质界面。因此，磁损耗和介电损耗的协同效应增强了 ZnOCo@C 的微波吸收性能。通过异质界面构建和结构调控，ZnOCo@C表现出6.12 GHz的超宽有效吸收带，在8.9 GHz时最小反射损耗达到-46.77 dB。结果表明，亚毫米孔结构的存在有利于GHz电磁波的进入，与ZnOCo异质结构的协同作用增强了ZnOCo@C的电磁波损耗。此外，雷达交叉模拟可降低至 24.36 dB m²且RCS值在-70°至70°范围内完全低于-16.32 dB m ^{2 。}该工作为MOFs基电磁波吸收材料的结构设计和成分调整提供了新思路。