In-situ grown NiCo bimetal anchored on porous straw-derived biochar composites with boosted microwave absorption properties

• Published in: International journal of minerals, metallurgy and materials Vol. 30; no. 3; pp. 515 - 524
• Main Authors: Zhou, Yuanyuan, Bai, Zhongyi, Yang, Xiangyang, Liu, Wei, Fan, Bingbing, Yan, Zhikai, Guo, Xiaoqin
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01-03-2023; Springer Nature B.V; Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Material Science and Engineering,Zhengzhou University ofAeronautics,Zhengzhou 450046,China%School of Chemical&Environmental Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China%School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,China
• Subjects: Absorption; Aeronautics; Bimetals; Biomass; Carbon; Ceramics; Characterization and Evaluation of Materials; Charcoal; Chemistry and Materials Science; Composite materials; Composites; Corrosion and Coatings; Dielectric properties; Fourier transforms; Glass; High temperature; Hydrothermal reactions; Intermetallic compounds; Materials Science; Metallic Materials; Metals; Microwave absorption; Natural Materials; Oxidation; Parameter modification; Recarburizing; Spectrum analysis; Surfaces and Interfaces; Thin Films; Tribology; Weight reduction; impedance matching; interfacial polarization; magnetic loss; straw-derived biochar; microwave absorption; bimetallic NiCo
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-022-2496-2

With the gradually increasing protection awareness about electromagnetic pollution, the demand for absorbing materials with renewability and environmental friendliness has attracted widespread attention. In this work, composites consisting of straw-derived biochar combined with NiCo alloy were successfully fabricated through high-temperature carbonization and subsequent hydrothermal reaction. The electromagnetic parameters of the porous biocarbon/NiCo composites can be effectively modified by altering their NiCo content, and their improved absorbing performance can be attributed to the synergy effect of magnetic-dielectric characteristics. An exceptional reflection loss of −27.0 dB at 2.2 mm thickness and an effective absorption bandwidth of 4.4 GHz (11.7–16.1 GHz) were achieved. These results revealed that the porous biocarbon/NiCo composites could be used as a new generation absorbing material because of their low density, light weight, excellent conductivity, and strong absorption.