Abstract
Bio-char decorated with inorganic magnetic component has shown great potential as a microwave absorbent because of the synergistic effect of two components. This composite holds promising prospects for applications in both military and civilian sectors. However, the composition and structure design of magnetic material/bio-char composites is still a challenge. Herein, the Co3Fe7/watermelon pulp biomass carbon (WPC) composite was designed. CoFe2O4 was converted into Co3Fe7 when co-calcined with pre-treated watermelon pulp (PWP). The EAB of Co3Fe7/WPC reaches 6.00 GHz at the thickness of 2 mm. The results show that this exceptional absorption performance of Co3Fe7/WPC is owed to its optimal impedance matching, multiple polarization and superior conductive loss. This work provides reference value for the preparation strategy of sustainable high-efficiency electromagnetic wave absorbing materials.
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