Construction of MOF-derived plum-like NiCo@C composite with enhanced multi-polarization for high-efficiency microwave absorption

Cheng, Runrun; Wang, Yan; Di, Xiaochuang; Lu, Zhao; Wang, Ping; Ma, Mingliang; Ye, Jinrui

doi:10.1016/j.jcis.2021.11.197

Cited by 122 publications

(33 citation statements)

References 60 publications

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“…These results indicate that the dielectric loss is mainly caused by the interface polarization and the conductive loss. [ 46 ] According to the Debye theory, the Cole–Cole semicircle can be used to analyze the polarization process, where each semicircle can represent a relaxed polarization. [ 47 ] As shown in Figure S2, Supporting Information, it can be clearly seen that all samples show several distinguishable semicircles, confirming the multiple relaxation process, further suggesting the existence of interface formed by the loading substance and SC matrix.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Mao

Liang

et al. 2022

Physica Status Solidi (a)

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To cut the cost of microwave absorption materials (MAMs) and achieve the recycling of semicoke (SC), the by‐product in coal hydrogasification process, SC was applied to prepare composite MAMs. The facile synthesis process involves liquid‐phase impregnation, and then in situ carbothermal reduction treatment. Champion sample prepared under 800 °C (FeSC800) exhibits the minimum reflection loss (RLmin) of −39.3 dB under a coating thickness of 2.5 mm, and the effective absorption bandwidth (EAB) can reach 3.9 GHz (14.1–18 GHz) at a coating thickness of 1.5 mm. The enhancement of interfacial and dipole polarization, as well as the synergistic effect between the dielectric properties of SC matrix and the magnetic properties of Fe particles, can account for the excellent microwave absorption (MA) performance. In view of the source of SC matrix, the prepared FeSC800 was not only expected to become a candidate in the field of MAMs, but also presented a promising approach for the resource utilization of SC.

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Section: Resultsmentioning

confidence: 99%

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Mao

Liang

et al. 2022

Physica Status Solidi (a)

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“…[61] When magnetization lags behind the alternating electromagnetic field, hysteresis loss will occur, such as irreversible displacement/rotation of domain walls, which will consume electromagnetic energy. [62,63] From the decreasing trend of the Co curves, MOF-O1 and MOF-O2 have higher hysteresis loss. The representation of formants in the Co curve is attributed to natural resonance (2-5 GHz) and exchange resonance (5-18 GHz) while MOF-O1 and MOF-O2 have stronger and more formants in the natural resonance band.…”

Section: Electromagnetic Parameter and Performancementioning

confidence: 99%

Ion‐Exchange Strategy for Metal‐Organic Frameworks‐Derived Composites with Tunable Hollow Porous and Microwave Absorption

Tao

Tan

et al. 2022

Small Methods

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electromagnetic energy conversion workstations" presents a viable approach to address the above challenge, which requires the development of high-performance microwave absorbing (MA) materials. [1][2][3] Metal-organic frames (MOFs), constructed from potential metal units (e.g., Fe, [4] Co, [5] and Ni [6] ) and organic ligand, are possible idea candidates due to the dazzling collocation, easy-to-lock dielectric/magnetic combination, [7,8] as well as favorable electromagnetic coordination and attenuation. [9][10][11] At present, increasingly stringent performance indicators, such as wide electromagnetic absorption bandwidth (EAB >7 GHz), limit the promotion of MOFs. Fortunately, the micro-engineering of such MOFs with cavities, such as yolk-shell, [12][13][14] macroporous, [15,16] and especially hollow, [17,18] has been demonstrated to reduce the density, suppress eddy current, and improve impedance matching. [19] However, traditional hollow routes, such as the external template methods (e.g., SiO 2 , polystyrene, etc.), [20] have been revealed to be time-consuming, complex, and acid-base corrosion. [21,22] Zeolite imidazole frame-67 (ZIF-67) has been the most studied template, in which Co 2+ ions are connected to imidazole Hollow metal-organic frameworks (MOFs) with careful phase engineering have been considered to be suitable candidates for high-performance microwave absorbents. However, there has been a lack of direct methods tailored to MOFs in this area. Here, a facile and safe Ni 2+ -exchange strategy is proposed to synthesize graphite/CoNi alloy hollow porous composites from Ni 2+ concentration-dependent etching of Zeolite imidazole frame-67 (ZIF-67) MOF and subsequent thermal field regulation. Such a special combination of hollow structure and carefully selected hybrid phase are with optimized impedance matching and electromagnetic attenuation. Especially, the suitable carrier transport model and the rich polarization site enhance the dielectric loss, while more significant hysteresis loss and more natural resonance increase the magnetic loss. As a result, excellent microwave absorbing (MA) performances of both broadband absorption (7.63 GHz) and high-efficiency loss (-63.79 dB) are obtained. Moreover, the applicability and practicability of the strategy are demonstrated. This work illustrates the unique advantages of ion-exchange strategy in structure design, component optimization, and electromagnetic regulation, providing a new reference for the 5G cause and MA field.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smtd.202200429.

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“…Nevertheless, the signals of precision instruments are seriously affected by surrounding microwave radiations [ 3 – 5 ]. Moreover, the excessive microwave emission has been considered as a novel hazardous source of pollution deeply, significantly threating human health [ 6 , 7 ]. Therefore, designing high-performance microwave absorption materials (MAMs) has become an urgent and indispensable demand [ 8 – 10 ].…”

Section: Introductionmentioning

confidence: 99%

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

et al. 2022

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Microwave has been widely used in many fields, including communication, medical treatment and military industry; however, the corresponding generated radiations have been novel hazardous sources of pollution threating human’s daily life. Therefore, designing high-performance microwave absorption materials (MAMs) has become an indispensable requirement. Recently, metal–organic frameworks (MOFs) have been considered as one of the most ideal precursor candidates of MAMs because of their tunable structure, high porosity and large specific surface area. Usually, MOF-derived MAMs exhibit excellent electrical conductivity, good magnetism and sufficient defects and interfaces, providing obvious merits in both impedance matching and microwave loss. In this review, the recent research progresses on MOF-derived MAMs were profoundly reviewed, including the categories of MOFs and MOF composites precursors, design principles, preparation methods and the relationship between mechanisms of microwave absorption and microstructures of MAMs. Finally, the current challenges and prospects for future opportunities of MOF-derived MAMs are also discussed."Image missing"

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Construction of MOF-derived plum-like NiCo@C composite with enhanced multi-polarization for high-efficiency microwave absorption

Cited by 122 publications

References 60 publications

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Ion‐Exchange Strategy for Metal‐Organic Frameworks‐Derived Composites with Tunable Hollow Porous and Microwave Absorption

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

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