Journal ArticleDOI
Multidimension-Controllable Synthesis of MOF-Derived Co@N-Doped Carbon Composite with Magnetic-Dielectric Synergy toward Strong Microwave Absorption
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TLDR
Carbonized Co@NC composites possess the following advantages: i) controllable dimension and morphology to balance the electromagnetic properties with evenly charged density distribution; ii) magnetic-carbon composites offer plenty of interfacial polarization and strong magnetic coupling network; iii) a MOF-derived dielectric carbon skeleton provides electronic transportation paths and enhances conductive dissipationAbstract:
Metal-organic framework (MOF) is highly desirable as a functional material owing to its low density, tunable pore size, and diversity of coordination formation, but limited by the poor dielectric properties. Herein, by controlling the solvent and mole ratio of cobalt/linker, multidimension-controllable MOF-derived nitrogen-doped carbon materials exhibit tunable morphology from sheet-, flower-, cube-, dodecahedron- to octahedron-like. Tunable electromagnetic parameters of Co@N-doped carbon composites (Co@NC) can be obtained and the initial MOF precursor determines the distribution of carbon framework and magnetic cobalt nanoparticles. Carbonized Co@NC composites possess the following advantages: i) controllable dimension and morphology to balance the electromagnetic properties with evenly charged density distribution; ii) magnetic-carbon composites offer plenty of interfacial polarization and strong magnetic coupling network; iii) a MOF-derived dielectric carbon skeleton provides electronic transportation paths and enhances conductive dissipation. Surface-mediated magnetic coupling reflects the stray magnetic flux field, which is corroborated by the off-axis electron holography and micro-magnetic simulation. Optimized octadecahedral Co@NC sample exhibits the best microwave absorption (MA) of -53.0 dB at the thickness of 1.8 mm and broad effective frequency from 11.4 to 17.6 GHz (Ku-band). These results pave the way to fabricate high-performance MA materials with balanced electromagnetic distribution and controlled morphology.read more
Citations
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Journal ArticleDOI
Multifunctional Magnetic Ti3C2Tx MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance.
Luyang Liang,Qianming Li,Xu Yan,Yuezhan Feng,Yaming Wang,Hao-Bin Zhang,Xingping Zhou,Chuntai Liu,Changyu Shen,Xiaolin Xie +9 more
TL;DR: In this paper, the authors proposed a multicomponent strategy for advanced electromagnetic wave absorbing (EMA) materials with strong absorption and a broad effective spectrum absorbing (SSA) capability.
Journal ArticleDOI
Diverse Metal–Organic Framework Architectures for Electromagnetic Absorbers and Shielding
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A review on carbon/magnetic metal composites for microwave absorption
TL;DR: In this article, the authors introduce the mechanisms of microwave absorption and summarize the recent advances in carbon/magnetic metal composites, and discuss the preparation methods and microwave absorption properties of different components, morphologies and microstructures.
Journal ArticleDOI
MOF-Derived Ni1-xCox@Carbon with Tunable Nano-Microstructure as Lightweight and Highly Efficient Electromagnetic Wave Absorber.
TL;DR: Magnetic-dielectric synergy effect among the Ni1−xCox@Carbon microspheres was confirmed by the off-axis electron holography technology, and MOF-derived porous Ni1-xC Cox@Carbons composites with tuning nano-micro structure were successfully synthesized.
Journal ArticleDOI
Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption
TL;DR: In this paper , the advances in low-dimensional core-shell EM wave absorption materials are outlined and a selection of the most remarkable examples is discussed, and the derived key information regarding dimensional design, structural engineering, performance, and structure-function relationship are comprehensively summarized.
References
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Journal ArticleDOI
In Situ Coupling of Strung Co4N and Intertwined N–C Fibers toward Free-Standing Bifunctional Cathode for Robust, Efficient, and Flexible Zn–Air Batteries
TL;DR: The obtained free-standing and highly flexible bifunctional oxygen electrode exhibits excellent electrocatalytic activity and stability for both OER and ORR in terms of low overpotential, a positive half-wave potential for OER, and a stable current density retention for at least 20 h.
Journal ArticleDOI
Cross-Stacking Aligned Carbon-Nanotube Films to Tune Microwave Absorption Frequencies and Increase Absorption Intensities
TL;DR: The incorporation of a second phase such as a metal and a conducting polymer greatly enhances the microwave-absorption capability and a remarkable reflection loss is achieved.
Journal ArticleDOI
General Oriented Formation of Carbon Nanotubes from Metal–Organic Frameworks
Jiashen Meng,Chaojiang Niu,Linhan Xu,Jiantao Li,Xiong Liu,Xuanpeng Wang,Yuzhu Wu,Xiaoming Xu,Wenyi Chen,Qi Li,Zi-Zhong Zhu,Dongyuan Zhao,Liqiang Mai,Liqiang Mai +13 more
TL;DR: A facile, general and high-yield strategy for the oriented formation of CNTs from metal-organic frameworks (MOFs) through a low-temperature pyrolysis process, which is successfully extended to obtain various oriented CNT-assembled architectures by modulating the corresponding MOFs, which further homogeneously incorporate heteroatoms into the C NTs.
Journal ArticleDOI
Ti3C2 MXenes with Modified Surface for High-Performance Electromagnetic Absorption and Shielding in the X-Band
Meikang Han,Xiaowei Yin,Heng Wu,Zexin Hou,Changqing Song,Xinliang Li,Litong Zhang,Laifei Cheng +7 more
TL;DR: Considering the promising performance of Ti3C2 MXenes with the modified surface, this work is expected to open the door for the expanded applications of MXenes family in EM absorbing and shielding fields.
Journal ArticleDOI
Bimetal-Organic Framework Derived CoFe2O4/C Porous Hybrid Nanorod Arrays as High-Performance Electrocatalysts for Oxygen Evolution Reaction
TL;DR: Porous CoFe2 O4 /C NRAs supported on nickel foam@NC are directly fabricated by the carbonization of bimetal-organic framework NRAs grown on NF@poly-aniline(PANI), and they exhibit high electrocatalytic activity, low overpotential, and high stability for the oxygen evolution reaction in alkaline media.