Journal
SMALL METHODS
Volume 6, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202200429
Keywords
hollow structures; ion-exchange strategy; microwave absorption; MOFs; ZIF-67/CoNi-LDHs
Funding
- National Natural Science Foundation of China [52172295]
- Open Fund of Key Laboratory of Materials Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology [56XCA20013-05]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_0179]
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A facile and safe Ni2+-exchange strategy was proposed to synthesize graphite/CoNi alloy hollow porous composites with optimized impedance matching and electromagnetic attenuation. The composites exhibited excellent microwave absorbing performances.
Hollow metal-organic frameworks (MOFs) with careful phase engineering have been considered to be suitable candidates for high-performance microwave absorbents. However, there has been a lack of direct methods tailored to MOFs in this area. Here, a facile and safe Ni2+-exchange strategy is proposed to synthesize graphite/CoNi alloy hollow porous composites from Ni2+ concentration-dependent etching of Zeolite imidazole frame-67 (ZIF-67) MOF and subsequent thermal field regulation. Such a special combination of hollow structure and carefully selected hybrid phase are with optimized impedance matching and electromagnetic attenuation. Especially, the suitable carrier transport model and the rich polarization site enhance the dielectric loss, while more significant hysteresis loss and more natural resonance increase the magnetic loss. As a result, excellent microwave absorbing (MA) performances of both broadband absorption (7.63 G Hz) and high-efficiency loss (-63.79 dB) are obtained. Moreover, the applicability and practicability of the strategy are demonstrated. This work illustrates the unique advantages of ion-exchange strategy in structure design, component optimization, and electromagnetic regulation, providing a new reference for the 5G cause and MA field.
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