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Achievement of excellent microwave absorption on the Co/C-based composite from coal hydrogasification residue by Fei Gao; Liping Liang; Lutao Mao; Yake Wang; Baoshun Zhu; Rong Zhang; Guomin Li is a Materials Science article available to read on EtoBox.

What is Achievement of excellent microwave absorption on the Co/C-based composite from coal hydrogasification residue about?

Coal hydrogasification semi-coke (CHSC for short) is a coal-based solid waste with high content of carbon and well-developed porous structures. With CHSC as the carbonaceous matrix, Co/carbon-based composite microwave absorption (MA) materials were prepared by a liquid-phase impregnation and then an in-situ carbothermal reduction. And the MA performance of these composites were further optimized by altering the Co content. At the proper carbothermal temperature of 700 °C and concentration of Co(NO3)2 solution of 0.69 M, the composite CoSC700–20 demonstrated the optimal MA performance with the lowest reflection loss value of −40.2 dB and the maximum absorption bandwidth up to 5.0 GHz at a coating thickness of 2 mm. Both the graphitized carbon and porous structure inherited form CHSC serve important roles in this exceptional MA performance, as they are essential to the formation of uniformly dispersed conductive network and the estabilishments of multiple reflections and scattering of microwaves. The high dispersion of Co particles on CHSC surface not only enhances the polarization losses but also facilitates impedance matching. This study will provide inspirations for either the low

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Author

Fei Gao; Liping Liang; Lutao Mao; Yake Wang; Baoshun Zhu; Rong Zhang; Guomin Li

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Materials Science (Physical Sciences)