Rational Construction of Hierarchically Porous Fe-Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption.
Rational Construction of Hierarchically Porous Fe-Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption.
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DOI：
10.1007/s40820-019-0307-8
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发表时间：
2019-09-13
影响因子：
26.6
通讯作者：
Zhao Y
中科院分区：
文献类型：
--
作者：
Wang S;Xu Y;Fu R;Zhu H;Jiao Q;Feng T;Feng C;Shi D;Li H;Zhao Y
成功制备了多级多孔Fe-Co/N掺杂碳/rGO（Fe-Co/NC/rGO）复合材料。复合材料中大孔、中孔和微孔共存。分级多孔Fe-Co/NC/rGO显示出9.29 GHz的有效带宽。本文的在线版本（10.1007/s40820-019-0307-8）包含补充材料，可供授权用户使用。研制轻质、宽频带的微波吸收材料是解决严重电磁辐射污染的一个重大挑战。在此，设计并合成了一种新型的具有分级多孔结构的Fe-Co/N掺杂碳/还原氧化石墨烯（Fe-Co/NC/rGO）复合材料。Fe-Co/NC复合材料均匀分布在多孔rGO片上。多组分的Fe-Co/NC/rGO复合材料（Fe/Co/NC/rGO）具有磁损耗、介电损耗、电阻损耗、界面极化和良好的阻抗匹配。Fe-Co/NC/rGO的分级多孔结构增强了微波的多次反射和散射。与Co/NC和Fe-Co/NC相比，Fe-Co/NC/rGO多级多孔复合材料由于合理的组成和孔结构设计，具有更好的微波吸收性能。其最小反射损耗（RLmin）在11.28 GHz处达到− 43.26 dB，厚度为2.5 mm，有效吸收频率（RL ≤ − 10 dB）在相同厚度下达到9.12 GHz（8.88-18 GHz）。此外，9.29 GHz的最宽有效带宽出现在2.63 mm的厚度处。本工作提供了一种轻质宽带吸波材料，同时也为设计具有多组分、多级多孔结构的高性能吸波材料提供了一种新的思路。本文的在线版本（10.1007/s40820-019-0307-8）包含补充材料，可供授权用户使用。
Hierarchically porous Fe–Co/N-doped carbon/rGO (Fe–Co/NC/rGO) composites were successfully prepared. Macropores, mesopores, and micropores coexisted in the composites. Hierarchically porous Fe–Co/NC/rGO showed effective bandwidth of 9.29 GHz. The online version of this article (10.1007/s40820-019-0307-8) contains supplementary material, which is available to authorized users. Developing lightweight and broadband microwave absorbers for dealing with serious electromagnetic radiation pollution is a great challenge. Here, a novel Fe–Co/N-doped carbon/reduced graphene oxide (Fe–Co/NC/rGO) composite with hierarchically porous structure was designed and synthetized by in situ growth of Fe-doped Co-based metal organic frameworks (Co-MOF) on the sheets of porous cocoon-like rGO followed by calcination. The Fe–Co/NC composites are homogeneously distributed on the sheets of porous rGO. The Fe–Co/NC/rGO composite with multiple components (Fe/Co/NC/rGO) causes magnetic loss, dielectric loss, resistance loss, interfacial polarization, and good impedance matching. The hierarchically porous structure of the Fe–Co/NC/rGO enhances the multiple reflections and scattering of microwaves. Compared with the Co/NC and Fe–Co/NC, the hierarchically porous Fe–Co/NC/rGO composite exhibits much better microwave absorption performances due to the rational composition and porous structural design. Its minimum reflection loss (RLmin) reaches − 43.26 dB at 11.28 GHz with a thickness of 2.5 mm, and the effective absorption frequency (RL ≤ − 10 dB) is up to 9.12 GHz (8.88–18 GHz) with the same thickness of 2.5 mm. Moreover, the widest effective bandwidth of 9.29 GHz occurs at a thickness of 2.63 mm. This work provides a lightweight and broadband microwave absorbing material while offering a new idea to design excellent microwave absorbers with multicomponent and hierarchically porous structures. The online version of this article (10.1007/s40820-019-0307-8) contains supplementary material, which is available to authorized users.
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