Issue 36, 2023

Co/CeO2/C composites derived from bimetallic metal–organic frameworks for efficient microwave absorption

Abstract

CeO2, an n-type semiconductor material, has been widely used in microwave absorption (MA) due to its unique structural features such as oxygen vacancies and interstitial atoms. In this paper, Co/CeO2/C composites were prepared by a hydrothermal method followed by a pyrolysis process. The effect of different pyrolysis temperatures (650–950 °C) on the MA property of the composites was investigated. When the pyrolysis temperature was 850 °C, the Co/CeO2/C-850 composite exhibited outstanding MA behavior in the frequency range of 2–18 GHz, displaying a minimum reflection loss (RLmin) of −45.22 dB and an effective absorption bandwidth (EAB) of 4.61 GHz at a thin thickness of 1.75 mm. The MA performance of the Co/CeO2/C composites is mainly attributed to the dielectric loss due to interfacial polarization originating from different interfaces and dipole polarization caused by the oxygen vacancies in CeO2. In addition, the introduction of Co nanoparticles not only provides the magnetic loss but also modulates impendence matching for the current magnetoelectric coupling system.

Graphical abstract: Co/CeO2/C composites derived from bimetallic metal–organic frameworks for efficient microwave absorption

Article information

Article type
Paper
Submitted
29 Jun 2023
Accepted
09 Aug 2023
First published
10 Aug 2023

Dalton Trans., 2023,52, 12632-12645

Co/CeO2/C composites derived from bimetallic metal–organic frameworks for efficient microwave absorption

Z. Yao, S. Xu, X. Zhang, J. Zhu, P. Liao, J. Yuan, C. Rong, X. Liu, Z. Xiong, S. Kang and F. Kuang, Dalton Trans., 2023, 52, 12632 DOI: 10.1039/D3DT02036C

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