Journal
CARBON
Volume 156, Issue -, Pages 378-388Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.09.063
Keywords
Cubic hollow ZIF-67; Self-templated; PDA; Co/N/C composites; MnO2 nanosheets; Microwave absorption
Funding
- National Natural Science Foundation of China [51673040, 21978048]
- Natural Science Foundation of Jiangsu Province [BK20171357, BK20180366]
- Opening Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [GD201802-5]
- Fundamental Research Funds for Central Universities [2242019k30042]
- Scientific Innovation Research Foundation of College Graduate in Jiangsu Province [KYCX19_0103]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [1107047002]
- Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China [BA2018045]
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Green and facile strategies for fabricating hollow microwave absorption materials without harmful solvent etching have attracted extensive attention but still remain a challenge. Herein, the cubic hollow Co/N/C@MnO2 composites were prepared through metal-organic frameworks (MOFs) self-templated eco-friendly method with polydopamine (PDA) as carbon source and hierarchical MnO2 nanosheets were incorporated for improving impedance mismatch caused by excessive permittivity in Co/N/C. Such a uniform distribution of Co particles in the N-doped porous carbon matrix, in association with the hollow structure and hierarchical MnO2 nanosheets, endow the composites with enhanced electromagnetic (EM) wave absorption. Notably, Co/N/C@MnO2 sample with a filler loading of 15 wt% shows extraordinary EM wave absorbing performance with the minimum reflection loss (RL) of -58.9 dB and wide absorption bandwidth of 5.5 GHz. Several minimum RL values at a thickness in the range of 1.5-5 mm, are below than -50 dB, outperforming many similar materials reported previously. Besides, the possible microwave absorption mechanism was elaborated in detail. Our work provides an environmentally friendly and facile route for fabricating MOFs self-templated hollow carbon-based microwave absorbers. (C) 2019 Elsevier Ltd. All rights reserved.
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