JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 13
·5371-5386
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IF 3.5
Cai Haopeng,Lin Zhenqin,Gao Lihua,Feng Chaochao,Tang Rui
Abstract The derivatives of metal–organic frameworks have been proven to be ideal candidates for microwave absorption due to their ability to form diverse microstructures of metals/heteroatom doped-carbon composites. In this study, we synthesized three types of zinc oxide (ZnO)@ZIF-8 with varying ZIF-8 shell thicknesses using ZnO colloidal spheres as sacrificial templates. Subsequently, we investigated the microwave absorption properties of a series of non-magnetic ZnO/N-doped carbon nanospheres pyrolyzed by ZnO@ZIF-8 at different temperatures. Remarkably, the non-magnetic samples (30 wt% filler loading) with a hollow structure pyrolyzed at 800 °C exhibited a broad effective absorption band exceeding 6 GHz. The excellent microwave absorbing performance of the samples pyrolyzed at 800 °C can be attributed to the reduction of the ZnO core to Zn 0 , anchoring it in the graphitized N-carbon layer, and the formation of an inner hollow cavity that enhances impedance matching. Therefore, this research not only provides an array of excellent dielectric-type microwave absorbing materials but also presents a novel strategy for developing lightweight and high-performance non-magnetic carbon-based microwave absorbing materials. Graphical abstract
研究领域:
材料科学
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电磁材料
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微波工程
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2026
·
IF 4.9
Qi Wang,Weibo Zhou,Xin Wang,Wenbo Sun,Yuhui Ao,Ming Li
The increasing electromagnetic radiation from electronic devices has created an urgent demand for structural composites that simultaneously exhibit high mechanical performance and effective electromagnetic interference (EMI) shielding capability. Herein, a multiscale interfacial modification strategy for carbon fiber (CF) composites is proposed to achieve synergistic enhancement of load transfer efficiency and EMI shielding performance. Zn-based metal–organic framework (Zn-MOF) is first in situ grown on the CF surface via a polydopamine (PDA) interlayer, followed by a two-step calcination process to generate a tightly bonded ZnO/C hybrid coating. Subsequently, a conductive PEDOT:PSS (PP) layer is deposited to construct a hierarchical conductive network. Owing to the optimized multiscale interfacial architecture, the resulting CF-PDA-ZnO-PP composites exhibit significant improvements in mechanical properties, with the interlaminar shear strength, flexural strength, and flexural modulus increased by 44%, 41%, and 87%, respectively, compared with untreated CF composites. Meanwhile, the composite achieves a total shielding effectiveness (SE T ) of 44 dB, indicating excellent EMI shielding capability. This work provides a feasible and scalable approach for the design of next-generation structural composites with high load-bearing capacity and EMI shielding functionality, showing strong potential for applications in aerospace, transportation, and high-end electronic equipment. Highlights PDA assisted uniform growth of Zn-MOF-derived ZnO@C on CF. Simultaneously enhancing interfacial strength and EMI properties. Optimal flexural modulus increased by 87% than pristine CFRP. Optimal EMI SE increased by 101% than pristine CFRP.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21569-21577
·
IF 7.443
Zhaoqiang Li,Longwei Yin
A sandwich-like structure with reduced graphene oxide (RGO) wrapped MOF-derived ZnCo2O4–ZnO–C polyhedrons on nickel foam as an anode for high performance lithium ion batteries (LIBs) is for the first time reported via simply growing MOFs on Ni foam, and wrapping graphene oxide nanosheets on MOFs, and then annealing under a N2 atmosphere. It should be noted that the MOF-derived porous products are composed of carbon-coated spinel ZnCo2O4–ZnO nanoparticle polyhedrons. When tested as anodes for LIBs, the unique RGO/ZnCo2O4–ZnO–C/Ni sandwich-structured LIB anodes exhibit superior coulombic efficiency, excellent cycling stability and rate capability. The in situ formed carbon layers outside the ZnCo2O4–ZnO act as not only a conductive substrate but also a buffer layer for volume changes. The open pores in ZnCo2O4–ZnO–C polyhedrons provide sufficient electrolyte as well as serve as cushion space to further alleviate volume changes. The RGO nanosheets act as a flexible protector to firmly fix polyhedrons on the Ni foam, as well as a conductive substrate to wire up all the polyhedrons. The interconnected carbon layers and two high conductive substrates (RGO and Ni foam) together form an unhindered highway for charge transfer during discharge/charge processes, promising good electrochemical performance.
研究领域:
材料科学
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电化学
·
纳米材料
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能源存储
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功能材料
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固态化学
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电极工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Huaqing Chen,Yuyan Wang,Shujia Zhang,Yuting He,Linrui Hou,Changzhou Yuan
Rechargeable Zn-ion batteries (ZIBs) have attracted much attention due to their high energy density, high safety, and low cost. Nevertheless, the practical implementation of ZIBs has been dreadfully hindered by the lack of stable high-capacity cathode candidate and serious dendritic growth in Zn anode. Superior device-level performance can only be achieved by simultaneously addressing the fatal shortcomings of both electrodes. Herein, we explore a two-pronged approach to achieving high-capacity, long-life stable ZIBs via synergistic design in both anodes and cathodes. Specifically, hierarchical accordion-like ZnV 2 O 4 @C (A-ZVO@C) framework derived from multi-layered V 2 CT x is fabricated and endowed with high electronic/ionic conductivities and structural/chemical stability, exhibiting striking high-rate capacities/stability when utilized as a cathode. Meanwhile, a dendrite-free Zn with an artificial protective layer of zincophilic ZnO/C hollow spheres affords outstanding Zn plating-stripping stability with a prolonged lifespan, which reduces local current density, homogenizes Zn 2+ ion diffusion/deposition, and suppresses volume changes during long-term plating/stripping. As a result, the assembled full ZIBs deliver a high-rate capacity of 232.2 mAh g −1 at 8 A g −1 , and superb stability with capacity degradation of 7.8 % over 3000 consecutive cycles at 15.0 A g −1 . More meaningfully, the contribution here provides an essential guidance for rationally designing next-generation ZIBs.
研究领域:
能量存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）