Architected Corncob-like LaFeO₃/Co/C Heterostructures from ZIF-67 for Thin-Thickness and Broadband Microwave Absorption

Developing high-performance microwave absorbers with strong absorption, broad bandwidth, and small thickness remains challenging. Herein, we report a novel strategy for constructing hierarchical LaFeO₃/Co/C composites by in-situ growing ZIF-67 on biomimetic corncob-like LaFeO₃ (LFO) followed by pyrolysis. The hollow architecture of LFO, featuring vertically aligned nanosheet arrays, provides abundant nucleation sites and facilitates multiple reflections and scattering of incident microwave. The synergistic effect between the dielectric LFO and magnetic Co/C significantly improved the impedance matching and attenuation. The optimized composite exhibited exceptional minimum reflection loss (RL min ) of -54.9   dB at 1.5   mm and a broad effective absorption bandwidth of 5.44   GHz at 1.7   mm (almost covering the entire Ku-band). The performance is attributed to the enhanced impedance matching, synergistic dielectric-magnetic loss, and intensive interfacial polarization. This work provides a valuable insight for designing high-efficiency EMW absorbers through morphological and compositional regulation.