2026-10-12T21:30:38Z https://www.scidb.cn/oai

10.57760/sciencedb.j00125.00209 2026-07-09T09:55:31Z

2026-07-09 Hierarchically Porous Hemp-Derived Carbon Supported CoFe Alloy Nanoparticles for High-Efficiency Electromagnetic Wave Absorption doi:10.57760/sciencedb.j00125.00209 en The escalating electromagnetic pollution necessitates high-performance, sustainable electromagnetic wave (EMW) absorbers. Herein, a lightweight and efficient CoFe alloy/biomass carbon composite (CoFe@hemp-C) is synthesized via a scalable grinding-assisted impregnation and one-step pyrolysis process, utilizing agricultural hemp stalk residue as the carbon precursor. This strategy enables the in-situ formation of uniformly dispersed CoFe nanoparticles within a hierarchically porous carbon matrix derived from the natural hemp structure. Benefiting from the conductive carbon network, abundant heterogeneous interfaces, and multilevel porous architecture, the composite exhibits enhanced conduction loss, interfacial polarization, dipolar polarization, and multiple scattering effects. The incorporation of CoFe alloy nanoparticles further increases the density of heterogeneous interfaces and polarization centers, thereby promoting dielectric attenuation. As a result, the optimized CoFe@hemp-C achieves a minimum reflection loss of −53.5 dB and an effective absorption bandwidth of 4.9 GHz at a thickness of 2.5 mm. This work provides an effective strategy for converting agricultural waste into high-value electromagnetic functional materials and offers new opportunities for the sustainable development of biomass-derived EMW absorbers. Electromagnetic wave absorption; Biomass-derived carbon; CoFe alloy; Impedance matching; Loss mechanisms. Niu Ben Liyu Chang Li Li Benyi Wei Weiyu Tang Wanxia Shi Zhichun Zhao Ming Li Jun Li Lin Liu Lina zhang xin ci RESTRICTED dataset Science Data Bank