A tunable structure lignin-derived carbon-based magnetic composite for efficient electromagnetic wave absorption

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2024-04, Vol.302, p.117229, Article 117229
• Main Authors: Hu, Lei, Pan, Hong, Xu, Lihui, Wang, Yihong, Fu, Xueqiang, Wang, Meng, Cai, Yangfang
• Format: Article
• Language: English
• Subjects: Bimetallic; Coordination; Electromagnetic wave absorber; Lignin-based carbon; Tunable structure
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2024.117229

•Composite was prepared by coordinate combination to improve the agglomeration phenomenon.•The impedance matching of composites was optimized by constructing mesoporous structures and regularized surface structures.•The absorption mechanism of the composite was explained by analyzing electromagnetic parameters and microscopic morphology.•The reflection loss and effective absorption bandwidth of the composites are −48.5 dB and 4.52 GHz, respectively. Biomass carbon has been widely studied as an electromagnetic wave-absorbing material in recent years due to its wide range of material sources, natural porous structure, and other advantages. Herein, a series of magnetic lignin-based carbon composites have been prepared as electromagnetic wave absorbers using carboxylation lignin as an organic ligand and Fe, Co as a metal ion. The bimetallic to coordinate combination with carboxylation lignin improved the agglomeration phenomenon, optimized mesoporous structure, and the pore distribution of the material compared to monometallic. This lignin-based FeCo@C had an abundant interfacial, mesoporous structure, dielectric, and magnetic loss capability. When the ratio of Fe and Co was 1:1, the reflection loss value of −48.5 dB at 12.3 GHz, and the effective absorption bandwidth achieved 4.52 GHz with a thickness of 2.5 mm. In short, this work provided a new direction for the preparation of renewable and high-performance lignin-based electromagnetic wave absorber materials.