A hierarchically three-dimensional CoNi/N-doped porous carbon nanosheets with high performance of electromagnetic wave absorption

Wu, Yuhan; Peng, Kangsen; Man, Zengming; Zang, Rui; Li, Pengxin; Liu, Shuaishuai; Wang, Siyu; Liu, Puyu; Li, Peng; Cui, Yihua

doi:10.1016/j.carbon.2021.12.025

Cited by 69 publications

(21 citation statements)

References 71 publications

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“…As discussed above, the eddy current loss, natural resonances, and exchange resonances together lead to the magnetic loss. Eddy current loss can be expressed by C 0 ( C 0 = μ″(μ′) −2 f –1 = 2πμ 0 d 2 δ) . CoAl-LDH-800, CoFe-PB-800, and CFCC@NC-800 provide a small change in the C 0 value in the high-frequency region (Figure d), indicating the presence of eddy current loss.…”

Section: Resultsmentioning

confidence: 99%

“…Eddy current loss can be expressed by C 0 (C 0 = μ″(μ′) −2 f −1 = 2πμ 0 d 2 δ). 45 CoAl-LDH-800, CoFe-PB-800, and CFCC@NC-800 provide a small change in the C 0 value in the high-frequency region (Figure 6d), indicating the presence of eddy current loss. CoAl-LDH-800 shows the lowest C 0 value due to the lower metal proportion in the sample.…”

Section: Resultsmentioning

confidence: 99%

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Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Zeng

Nie

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Constructing the strong interaction between the matrix and the active centers dominates the design of high-performance electromagnetic wave (EMW) absorption materials. However, the interaction-relevant absorption mechanism is still unclear, and the design of ultrahigh reflection loss (R L < −80 dB) absorbers remains a great challenge. Herein, CoFe-based Prussian blue (PB) nanocubes are coprecipitated on the surface of ultrathin CoAl-LDH nanoplates with the assistance of unsaturated coordination sites. During the subsequent pyrolysis process, CoAl-LDH serves as a “ligand” providing a Co source and reacts with Fe or C in the CoFe-PB “host” to form stable CoFe alloys or CoC x species. As a result, strong reactions emerged between the CoAl-LDH matrix and the active CoFe-CoC x @NC centers. Based on the experimental results, the CoAl/CoFe-CoC x @NC hierarchical heterostructure delivers good dielectric losses (dipolar polarization, interface polarization, and conductive loss), magnetic losses (eddy current loss, natural resonance, and exchange resonance), and impedance matching, resulting in a remarkable EMW absorption performance with a reflection loss (R L) value of −82.1 dB at a matching thickness of 3.8 mm. Theoretical results (commercial CST) identify that the strong interaction between the 2D CoAl-LDH “ligand” and 2D CoFe-CoC x “host” promotes a robust heterointerface among the nanoparticles, nanosheets, and nanoplates, which extremely contribute to the dielectric loss. Meanwhile, the coupling effect of nanosheets and nanoplates greatly contributes to the matching performance. This work provides an aggressive strategy for the effect of ligands and hosts on high-performance EMW absorption.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Zeng

Nie

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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“…The process of obtaining the foam generates a large amount of heat, an exothermic reaction, where the increase in temperature promotes the volatilization of excess formaldehyde and water present in the black liquor, generating bubbles during the solidification of the foam. Structures with high porosity can contribute to increasing the microwave absorption performance of the material, generating polarization interfaces, and suppressing the eddy current effects 38 . In addition, the presence of pores effectively reduces the density, making it possible to obtain a lighter material.…”

Section: Resultsmentioning

confidence: 99%

“…Features, such as low-cost and simple processing, are essential requisites in using waste. Furthermore, recent studies show the effects of PC on electromagnetic wave attenuation due to large surface area, by increasing interfacial polarization in the matrix where they are inserted [28][29][30][31][32] . Thus, porosity also plays a relevant role in the electromagnetic properties of the final composite.…”

Section: Introductionmentioning

confidence: 99%

Improved Microwave Absorption Performance with Sustainable Porous Carbon/Carbon Nanotube Composites

Medeiros

Silva

et al. 2022

Mat. Res.

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The great technological advancement in wireless communication systems and devices generated the problem of electromagnetic pollution. Developing lightweight, sustainable, and low-cost materials is necessary to minimize electromagnetic pollution. A sustainable porous carbon (PC) absorber material was obtained from the crude black liquor by a simple and low-cost synthesis, and combined with carbon nanotube (CNT), presenting excellent microwave attenuation results. The PC absorber at 20 wt.% filling ratio exhibited an intense reflection loss of -35.7 dB at 15.5 GHz, and bandwidth of 1.15 GHz for a thickness of 5.90 mm. By adding 0.2 wt.% of CNT, the reflection loss was -34.6 dB at 17.9 GHz, and a bandwidth of 1.54 GHz for 4.90 mm. The study reveals that the combination of PC and CNT improves the attenuation capacity, allows adjustment in the frequency range of the attenuation peak, and promotes thickness reduction. The results obtained allow us to advance studies in developing high-performance, sustainable, and low-cost microwave-absorbing materials.

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“…As shown in Fig. 3k, the d-spacing of 0.22 nm is corresponding to the (111) plane of CoNi alloy [36].…”

Section: Phase Composition and Microstructurementioning

confidence: 89%

Construction of hydrangea-like core–shell SiO ₂@Ti ₃C ₂T _x@CoNi microspheres for tunable electromagnetic wave absorbers

Niu¹,

Jiang²,

Xia³

et al. 2023

Journal of Advanced Ceramics

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Ti3C2TxMXene shows great potentials in the application as microwave absorbers due to its high attenuation ability. However, excessively high permittivity and self-stacking are the main obstacles that constrain its wide range of applications. To tackle these 2 problems, herein, the microspheres of SiO2@Ti3C2Tx@CoNi with the hydrangea-like core-shell structure were designed and prepared by a combinatorial electrostatic assembly and hydrothermal reaction method. These microspheres are constructed by an outside layers of CoNi nanosheets and intermediate Ti3C2TxMXene nanosheets wraping on the core of modified SiO2, engendering both homogenous and heterogeneous interfaces. Such trilayer SiO2@Ti3C2Tx@CoNi microspheres are "magnetic micro size supercapacitors" that can not only induce dielectric loss and magnetic loss but also provide multilayer interfaces to enhance the interfacial polarization. The optimized impedance matching and core-shell structure could boost the reflection loss by electromagnetic synergy. The synthesized SiO2@Ti3C2Tx@CoNi microspheres demonstrate outstanding microwave absorption performance benefited from these advantages. The obtained reflection loss value was -63.95 dB at an ultra-thin thickness of 1.2 mm, corresponding to an effective absorption bandwidth of 4.56 GHz. This work demonstrates the trilayer core-shell structure designing strategy is highly efficient for tuning the MA performance of MXene-based microspheres.

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A hierarchically three-dimensional CoNi/N-doped porous carbon nanosheets with high performance of electromagnetic wave absorption

Cited by 69 publications

References 71 publications

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Improved Microwave Absorption Performance with Sustainable Porous Carbon/Carbon Nanotube Composites

Construction of hydrangea-like core–shell SiO ₂@Ti ₃C ₂T _x@CoNi microspheres for tunable electromagnetic wave absorbers

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A hierarchically three-dimensional CoNi/N-doped porous carbon nanosheets with high performance of electromagnetic wave absorption

Cited by 69 publications

References 71 publications

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Coupling between the 2D “Ligand” and 2D “Host” and Their Assembled Hierarchical Heterostructures for Electromagnetic Wave Absorption

Improved Microwave Absorption Performance with Sustainable Porous Carbon/Carbon Nanotube Composites

Construction of hydrangea-like core–shell SiO 2@Ti 3C 2T x @CoNi microspheres for tunable electromagnetic wave absorbers

Contact Info

Product

Resources

About

Construction of hydrangea-like core–shell SiO ₂@Ti ₃C ₂T _x@CoNi microspheres for tunable electromagnetic wave absorbers