Preparation of CoFe@N-doped C/rGO composites derived from CoFe Prussian blue analogues for efficient microwave absorption

At present, in order to solve the problem of microwave radiation and interference, it is urgent to study high performance microwave absorption (MA) materials with strong absorption ability, light weight, thin thickness and broad bandwidth. In this work, CoFe@nitrogen-doped carbon/rGO (CoFe@NC/rGO) com-posites derived from CoFe Prussian blue analogues were successfully prepared by in situ growth and annealing. And the effects of GO content on the MA performances of the composites were studied system-atically. Results reveal that MA properties of CoFe@NC/rGO composites are enhanced by introduction of GO, this is mainly because the addition of GO can provide large specific surface area for microwave reflec-tion, enhance interfacial polarization and compensate the insufficient dielectric loss. Moreover, impe-dance matching, conduction loss and attenuation ability are also improved obviously. CoFe@NC/rGO composites show outstanding MA capability, and the minimum reflection loss is up to-53.0 dB at a thickness of 2.4 mm, the largest effective absorption bandwidth can achieve 4.48 GHz at a thin thickness of 1.7 mm. In consideration of the superior MA performances, the CoFe@NC/rGO composites will be ideal candidates for high-efficient MA applications. (c) 2021 Published by Elsevier Inc.

Automated summary

This study successfully prepared CoFe@NC/rGO composites with excellent microwave absorption (MA) performance. The introduction of GO significantly improved the microwave absorption properties, including increasing specific surface area, enhancing interfacial polarization, and compensating for insufficient dielectric loss.