Novel preparation of FeCo alloy/graphene foam composites for efficient microwave absorption

Liu, Zhen; Wang, Bo; Wei, Shicheng; Huang, Wei; Wang, Yujiang; Liang, Yi; Wang, Xinyang

doi:10.1016/j.carbon.2023.118452

Carbon

2023

DOI: 10.1016/j.carbon.2023.118452

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Novel preparation of FeCo alloy/graphene foam composites for efficient microwave absorption

Zhen Liu,

Bo Wang,

Shicheng Wei

et al.

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2024

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Cited by 19 publications

References 47 publications

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Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe₃O₄ multidimensional composites

Pang,

Zhou,

Gao

et al. 2024

Polymer Composites

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Excellent electromagnetic wave loss and impedance matching are typical characteristics of superior‐performance electromagnetic wave (EMW) absorption materials. Changing the component ratios and multidimensional combinations of various absorbing materials is one of the best methods to improve absorption performance. This work used a convenient physical mixing approach to combine three wave‐absorbing materials with various dimensions to successfully prepare Graphene/carbon nanotubes/Fe3O4 (G/C/Fe3O4)/paraffin composites. One‐dimensional (1D) tube carbon nanotubes (CNTs) pierced two‐dimensional (2D) sheet graphene to form a strong three‐dimensional (3D) conductive network, enhancing interfacial polarization without introducing zero‐dimensional (0D) magnetic Nano‐Fe3O4. Nevertheless, because of their significant dielectric characteristics, the graphene/carbon nanotube (G/C) paraffin composites displayed low impedance matching and electromagnetic wave absorption properties. At a mass ratio of 1:1, the G/C/paraffin composites achieved an ideal reflection loss (RL) of −11.99 db and an impedance matching value of 0.59. Adding Fe3O4 improved the impedance matching and electromagnetic wave loss performance and promoted the formation of a non‐homogeneous interface, improving interfacial polarization and reflection. The G/C/Fe3O4/paraffin composite, with a mass ratio of 1:1:6 and a filler ratio of 20%, achieved an optimum reflection loss of −37.2 dB and an effective absorption bandwidth of 4.16 GHz. This work optimized and improved the performance of EMW materials practically and rapidly, providing a research method for the widespread application of superior‐performance electromagnetic wave absorption materials.Highlights The EMW absorption materials with various architectures. 1D CNTs pierced 2D sheet graphene to form a strong 3D conductive network. Adding Fe3O4 promoted the formation of a non‐homogeneous interface. Electromagnetic synergies and different structural combinations It achieved excellent impedance matching and electromagnetic loss performance.

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Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe₃O₄ multidimensional composites

Pang,

Zhou,

Gao

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

show abstract

Self‐Templating Engineering of Hollow N‐Doped Carbon Microspheres Anchored with Ternary FeCoNi Alloys for Low‐Frequency Microwave Absorption

Li,

Ban,

Song

et al. 2024

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Rational design and precision fabrication of magnetic‐dielectric composites have significant application potential for microwave absorption in the low‐frequency range of 2–8 GHz. However, the composition and structure engineering of these composites in regulating their magnetic‐dielectric balance to achieve high‐performance low‐frequency microwave absorption remains challenging. Herein, a self‐templating engineering strategy is proposed to fabricate hollow N‐doped carbon microspheres anchored with ternary FeCoNi alloys. The high‐temperature pyrolysis of FeCoNi alloy precursors creates core‐shell FeCoNi alloy‐graphitic carbon nano‐units that are confined in carbon shells. Moreover, the anchored FeCoNi alloys play a critical role in maintaining hollow structural stability. In conjunction with the additional contribution of multiple heterogeneous interfaces, graphitization, and N doping to the regulation of electromagnetic parameters, hollow FeCoNi@NCMs exhibit a minimum reflection loss (RLmin) of −53.5 dB and an effective absorption bandwidth (EAB) of 2.48 GHz in the low‐frequency range of 2–8 GHz. Furthermore, a filler loading of 20 wt% can also be used to achieve a broader EAB of 5.34 GHz with a matching thickness of 1.7 mm. In brief, this work opens up new avenues for the self‐templating engineering of magnetic‐dielectric composites for low‐frequency microwave absorption.

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Understanding the Curvature Effect of FeCo Nanoalloy Encapsulated by Nitrogen‐Doped Carbon Nanotubes for High‐Performance Lithium–Sulfur Batteries

Jin,

Sun,

et al. 2024

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Well‐designed structures of the electrocatalyst provide excellent catalytic activity and high structural stability during the sulfur reduction reaction of Lithium–sulfur batteries (LSBs). In this study, a novel and efficient structure is developed to encapsulate bimetallic FeCo nanoalloy catalysts within N‐doped carbon nanotube (NCNT) on carbon nanofibers (FeCo@NCNT/CNFs) using a combination of electrospinning and rapid‐cooling techniques. The NCNT matrix with abundant sites not only serves as a high pathway for electron transport during the reaction, but its encapsulation structure also acts as armor to protect the FeCo nanoalloy. Further, the curvature effect of the FeCo@NCNT structure facilitates greater electron transfer from the FeCo nanoalloy to the NCNT, and lowering the reaction barrier for the liquid–solid conversion process. As a result, the S/FeCo@NCNT/CNFs cathode can achieve exceptional cycle performance of 500 cycles at 5 C, with an ultra‐low capacity fade rate of 0.031% per cycle. Moreover, even under extreme temperature conditions of −20 and 80 °C, the battery still delivers a specific capacity of 827.16 and 697.46 mAh g−1 at 1 C. This work shows an effective insight into enhancing the LiPS conversion kinetics over a wide temperature range in Li–S batteries.

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Novel preparation of FeCo alloy/graphene foam composites for efficient microwave absorption

Cited by 19 publications

References 47 publications

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe₃O₄ multidimensional composites

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe₃O₄ multidimensional composites

Self‐Templating Engineering of Hollow N‐Doped Carbon Microspheres Anchored with Ternary FeCoNi Alloys for Low‐Frequency Microwave Absorption

Understanding the Curvature Effect of FeCo Nanoalloy Encapsulated by Nitrogen‐Doped Carbon Nanotubes for High‐Performance Lithium–Sulfur Batteries

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Novel preparation of FeCo alloy/graphene foam composites for efficient microwave absorption

Cited by 19 publications

References 47 publications

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe3O4 multidimensional composites

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe3O4 multidimensional composites

Self‐Templating Engineering of Hollow N‐Doped Carbon Microspheres Anchored with Ternary FeCoNi Alloys for Low‐Frequency Microwave Absorption

Understanding the Curvature Effect of FeCo Nanoalloy Encapsulated by Nitrogen‐Doped Carbon Nanotubes for High‐Performance Lithium–Sulfur Batteries

Contact Info

Product

Resources

About

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe₃O₄ multidimensional composites

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe₃O₄ multidimensional composites