Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance

Li, Fushan, Li, Qiuyu, Kimura, Hideo, Xie, Xiubo, Zhang, Xiaoyu, Wu, Nannan, Sun, Xueqin, Xu, Bin, Algadi, Hassan, Pashameah, Rami Adel, Alanazi, Abdullah K., Alzahrani, Eman, Li, Haodong, Du, Wei, Guo, Zhanhu and Hou, Chuanxin (2022) Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance. Journal of Materials Science and Technology. ISSN 1005-0302

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Official URL: https://doi.org/10.1016/j.jmst.2022.12.003

Abstract

The microscopic morphology of electromagnetic wave absorbers influences the multiple reflections of electromagnetic waves and impedance matching, determining the absorption properties. Herein, the urchin-shaped bimetallic nickel-cobalt oxide/carbon (NiCo2O4/C) composites are prepared via a hydrothermal route, whose absorption properties are investigated by different morphologies regulated by changing calcination temperature. A minimum reflection loss (RLmin) of -75.26 dB is achieved at a matching thickness of 1.5 mm, and the effective absorption bandwidth (EAB) of 8.96 GHz is achieved at 2 mm. Multi-advantages of the synthesized NiCo2O4/C composites contribute to satisfactory absorption properties. First, the interweaving of the needle-like structures increases the opportunities for scattering and multiple reflections of incident electromagnetic waves, and builds up a conductive network to facilitate the enhancement of conductive losses. Second, the carbon component in the NiCo2O4/C composites enhances the interfacial polarization and reduces the density of the absorber. Besides, generous oxygen vacancy defects are introduced into the NiCo2O4/C composites, which induces defect polarization and dipole polarization. In summary, the ternary coordination of components, defects and morphology led to outstanding electromagnetic wave absorption, which lightened the path for improving the electromagnetic wave absorption property and enriching the family of NiCo2O4 absorbers with excellent performance.

Item Type: Article
Additional Information: Funding information: This work was financially supported by the National Natural Science Foundation of China (No. 52207249), the Natural Science Foundation of Shandong Province (No. ZR2022ME089), the research program of Top Talent Project of Yantai University (No. 1115/2220001), the Yantai Basic Research Project (No. 2022JCYJ04) and the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing (No. AMGM2021F11). The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by Grant Code: 22UQU4320141DSR72.
Uncontrolled Keywords: NiCo2O4/C, Oxygen vacancies, Interfacial polarization, Electromagnetic wave absorber
Subjects: H300 Mechanical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 03 Jan 2023 12:05
Last Modified: 03 Jan 2023 12:15
URI: https://nrl.northumbria.ac.uk/id/eprint/51022

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