Journal
CHEMICAL ENGINEERING JOURNAL
Volume 420, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127609
Keywords
Metal-organic framework; Second doped metal; Porous structure; Electromagnetic wave absorption; FeM(II)-MIL-88B
Categories
Funding
- National Natural Science Foundation of China [21902034]
- Startup R&D Funding from the OneHundred Young Talents Program of Guangdong University of Technology [220413714, 220413251]
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This study successfully designed controllable bimetallic Fe/M (M = Co, Ni, Mn) doped carbon microwave absorption materials based on MOFs precursor, achieving impedance matching between free space and the absorber. The optimized FeCo2@C exhibits strong EMW absorption performance and broad bandwidth with a low filler loading, showcasing the intensified role of rational doping the second metal source into the Fe-MOFs precursor to tune the microwave absorption performance.
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.
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