Journal of Materiomics

Journal of Materiomics

Volume 8, Issue 4, July 2022, Pages 852-862
Journal of Materiomics

Research paper
Anionic MOF derived Bimetallic NixCoy@Nano-porous carbon composites toward strong and efficient electromagnetic wave absorption

https://doi.org/10.1016/j.jmat.2022.01.002Get rights and content
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open access

Highlights

  • Anionic NixCoy-MOF precursors featuring N-rich ligands and hierarchical porous structures for microwave absorber.

  • The derived NixCoy@NPC shows strong microwave attenuation from synergistic effects of magnetic loss and dielectric loss.

  • The impedance matching can be effectively improved by tuning the Co/Ni amount in the precursors.

  • Ni@NPC exhibits strong and broad electromagnetic wave absorption.

Abstract

Metal-organic frameworks (MOFs) derived metallic nanoparticles embedded nano-porous carbon (NPC) composites have shown to be promising microwave absorbing materials. Although MOF precursors with diverse compositions and morphologies have been extensively investigated, anionic MOFs are rarely explored for this utility. In addition to the metal sites and ligands on the MOF framework, the guest counter-cations in the void provide supplementary parameters to tune the capability of microwave absorption. Herein, we applied an anionic NixCoy-MOF featuring N-rich ligands and hierarchical porous structures as a precursor for microwave absorption. The obtained dielectric-magnetic NixCoy@NPC composites with rich N dopants and multiple hetero-interfaces promote the microwave attenuation capability through enhanced dipole/interfacial relaxation. The synergistic effects of magnetic loss and conduction loss induced by metallic nanoparticles (NPs) and porous graphitic layers further facilitate the microwave dissipation. More significantly, impedance matching can be effectively improved by tuning the Co/Ni amount in the precursors to realize the modulation of electromagnetic parameters. Consequently, Ni@NPC exhibits the optimal electromagnetic wave (EMW) absorption with minimum reflection loss of −66 dB at only 2 mm and broad effective absorption band covering 4.56 GHz at a thin thickness of 2.07 mm, making this material promising absorber for EMW elimination.

Keywords

Anionic MOFs
MOF-Derived carbon composites
N-rich ligands
Dielectric loss
Magnetic loss
Electromagnetic wave absorption

Cited by (0)

Fan Zhang received her Bachelor's Degree from the Qufu Normal University in 2015 and she is currently a postgraduate student at Donghua University. Her research interests focus on MOF-derived carbon-based materials for electromagnetic wave absorption.

Dr. Qi Zheng is currently an associate professor in the College of Materials Science and Engineering at Donghua University (China). She received her Bachelor (2009) and Master degree (2012) at Shanghai University. She obtained PhD degree (2016) from University of Glasgow under the supervision of Professor Leroy Cronin and then worked as a Research Associate in the same group. Her research interests focus on design and synthesis of MOF-derived high-performance microwave absorbers and metal-oxo-clusters based energy materials.

Peer review under responsibility of The Chinese Ceramic Society.