Enhanced electromagnetic wave absorption performance of LaFeO3 in-situ grown on Co/C with optimized impedance matching

In this study, the novel Co/C/LaFeO 3 composites were synthesized by in-situ growth of LaFeO 3 on Co/C derived from ZIF-67. The electromagnetic wave (EMW) absorption performance of the Co/C/LaFeO 3 composites was investigated with varying proportions of Co/C and LaFeO 3 . When the weight ration of Co/C to LaFeO 3 was 2:1, the Co/C/LaFeO 3 composites exhibited a remarkable minimum reflection loss (RL min ) of −57.8 dB and demonstrated an effectively absorbing broadband (EAB, RL min  ≤ -10 dB) of 5.12 GHz at 1.7 mm. Benefiting from the combined impact of Co nanoparticles, carbon layer, and LaFeO 3 , diverse interfaces and conductive networks were formed, and optimized impedance matching was obtained. In addition, the incorporation of LaFeO 3 significantly enriched the electromagnetic loss mechanisms, ultimately enhancing the comprehensive EMW absorption efficiency of the Co/C/LaFeO 3 composites. This research serves as an essential guide for designing and synthesizing MOF-derived carbon composites with significant EMW absorption capacities.