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Bimetallic MOFs derived FeM(II)-alloy@C composites with high-performance electromagnetic wave absorption
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-11-06 , DOI: 10.1016/j.cej.2020.127609
Lei Li , Guilin Li , Wenjun Ouyang , Yaping Zhang , Fanzhen Zeng , Chenyu Liu , Zhan Lin

The realization of balance between relative permittivity and permeability is still a great challenge in the development of microwave absorption materials. Based on the controllable MOFs precursor, bimetallic Fe/M (M=Co, Ni, Mn) doped carbon derived from pyrolyzing bimetallic MOFs (FeM-MIL-88B) exhibits intriguing microwave absorption property. By tuning the second metal source and the ratio of Fe/M, in this work we realize impedance matching between free space and the absorber. Optimized FeCo2@C exhibits strong EMW absorption performance (-71.4 dB) and broad bandwidth (14.2 GHz) with a low filler loading of 25 wt%. The synergistic effect of the bimetal source on carbonization process and electric/magnetic properties prove that rationally doping the second metal source into the Fe-MOFs precursor to generate bimetallic magnetic nanoparticles/C material play an intensified role to tune the microwave absorption performance.



中文翻译:

具有高性能电磁波吸收能力的双金属MOF衍生的FeM(II)-Al @@ C复合材料

实现相对介电常数和磁导率之间的平衡仍然是开发微波吸收材料的巨大挑战。基于可控MOF的前驱体,热解双金属MOF(FeM-MIL-88B)衍生出的双金属Fe / M(M = Co,Ni,Mn)掺杂碳表现出令人着迷的微波吸收性能。通过调整第二金属源和Fe / M的比例,在这项工作中,我们实现了自由空间和吸收体之间的阻抗匹配。优化的FeCo 2@C具有很强的EMW吸收性能(-71.4 dB)和较宽的带宽(14.2 GHz),填充剂含量低至25 wt%。双金属源对碳化过程和电/磁性能的协同作用证明,将第二金属源合理地掺杂到Fe-MOFs前驱体中以生成双金属磁性纳米颗粒/ C材料对调节微波吸收性能起着增强的作用。

更新日期:2020-11-06
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