Facile synthesis of Co-embedded porous spherical carbon composites derived from Co3O4/ZIF-8 compounds for broadband microwave absorption

Wu, Qilei; Wang, Jun; Jin, Huihui; Dong, Yawen; Huo, Siqi; Yang, Shuang; Su, Xiaogang; Zhang, Bin

doi:10.1016/j.compscitech.2020.108206

Cited by 78 publications

(27 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, the α values continuously increase with improving the MXene content in the NiMR-H aerogel due to the increasing number of active groups and conductivity induced by the MXene (Figure f and Figure S32 in the Supporting Information). Although the NiM1R2-H aerogel exhibits a moderate α, the impedance matching allows EMWs to enter the absorbing materials as much as possible, which is the prerequisite to obtain a high EMA performance . Here, by assessing impedance matching from Z = Z in / Z 0 or |Δ| calculated by eqs S1 and S2 or eqs S12–S14 (Sections S2 and S5 in the Supporting Information), respectively, it can be revealed that the NiM1R2-H aerogel shows the best impedance matching as compared to other samples (Figures f and S33 and S34 in the Supporting Information).…”

Section: Results and Discussionmentioning

confidence: 93%

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Liang

Yan³

et al. 2021

ACS Nano

604

302

View full text Add to dashboard Cite

Ingenious microstructure design and a suitable multicomponent strategy are still challenging for advanced electromagnetic wave absorbing (EMA) materials with strong absorption and a broad effective absorption bandwidth (EAB) at thin sample thickness and low filling level. Herein, a three-dimensional (3D) dielectric Ti3C2T x MXene/reduced graphene oxide (RGO) aerogel anchored with magnetic Ni nanochains was constructed via a directional-freezing method followed by the hydrazine vapor reduction process. The oriented cell structure and heterogeneous dielectric/magnetic interfaces benefit the superior absorption performance by forming perfect impedance matching, multiple polarizations, and electric/magnetic-coupling effects. Interestingly, the prepared ultralight Ni/MXene/RGO (NiMR-H) aerogel (6.45 mg cm–3) delivers the best EMA performance in reported MXene-based absorbing materials up to now, with a minimal reflection loss (RLmin ) of −75.2 dB (99.999 996% wave absorption) and a broadest EAB of 7.3 GHz. Furthermore, the excellent structural robustness and mechanical properties, as well as the high hydrophobicity and heat insulation performance (close to air), guarantee the stable and durable EMA application of the NiMR-H aerogel to resist deformation, water or humid environments, and high-temperature attacks.

show abstract

Section: Results and Discussionmentioning

confidence: 93%

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Liang

Yan³

et al. 2021

ACS Nano

604

302

View full text Add to dashboard Cite

show abstract

“…32 ). Although the sample with a water content of 2 g g −1 exhibits a moderate α, the impedance matching allows EM waves to enter the absorbing materials as much as possible, which is the prerequisite to obtain a better EM wave absorbing property 52 . Since the microwave absorption stability of hygroscopic holey graphene aerogel fibers containing water is crucial in real applications, we characterized the long-time stability of LiCl@HGAF-H 2 O fibers in an electromagnetic environment with the power of +10 dBm.…”

Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

View full text Add to dashboard Cite

Aerogel fibers have been recognized as the rising star in the fields of thermal insulation and wearable textiles. Yet, the lack of functionalization in aerogel fibers limits their applications. Herein, we report hygroscopic holey graphene aerogel fibers (LiCl@HGAFs) with integrated functionalities of highly efficient moisture capture, heat allocation, and microwave absorption. LiCl@HGAFs realize the water sorption capacity over 4.15 g g−1, due to the high surface area and high water uptake kinetics. Moreover, the sorbent can be regenerated through both photo-thermal and electro-thermal approaches. Along with the water sorption and desorption, LiCl@HGAFs experience an efficient heat transfer process, with a heat storage capacity of 6.93 kJ g−1. The coefficient of performance in the heating and cooling mode can reach 1.72 and 0.70, respectively. Notably, with the entrapped water, LiCl@HGAFs exhibit broad microwave absorption with a bandwidth of 9.69 GHz, good impedance matching, and a high attenuation constant of 585. In light of these findings, the multifunctional LiCl@HGAFs open an avenue for applications in water harvest, heat allocation, and microwave absorption. This strategy also suggests the possibility to functionalize aerogel fibers towards even broader applications.

show abstract

“…Magnetic losses are caused by magnetic hysteresis, domain wall resonance, eddy current loss, exchange resonance, and natural resonance. , In principle, domain wall resonance losses take place at a megahertz frequency, and hysteresis loss happens in a strong magnetic field. To clarify the loss characteristics of CeFe 2 O 4 /GO to the magnetic field in the incident EM wave, this paper investigates the relationship between the size of the eddy current loss constant C 0 and the frequency, and the result is shown in Figure e.…”

Section: Resultsmentioning

confidence: 99%

CeFe₂O₄ Nanoparticle/Graphene Oxide Composites with Synergistic Superhydrophobicity and Microwave Absorption

Guo

Chen

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

High-performance superhydrophobic electromagnetic (EM) wave-absorbing materials are critically significant for their practical application in harsh environments, especially in high-humidity conditions. Herein, a CeFe2O4/GO hybrid was successfully constructed via a facile hydrothermal method, which was then combined with polydimethylsiloxane (PDMS) to achieve the synergistic effect of outstanding EM wave absorption ability and superhydrophobicity. The structure and composition of the prepared hybrid were confirmed with the help of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis. Meanwhile, a vector network analyzer was used for assessing the microwave absorbing performance of the fabricated composite. Eventually, the CeFe2O4/GO hybrid exhibited a minimum reflection loss (RL) of −57 dB at 15.2 GHz with an adequate absorption bandwidth of 5.2 GHz. Furthermore, the superhydrophobic PDMS/CeFe2O4/GO nanocomposite was synthesized using a facile mechanical mixing method, and the water contact angle of the nanocomposite with a ratio of 5:1 (CeFe2O4/GO/PDMS) could reach 164°. Simultaneously, the nanocomposite shows a stable EM wave absorption ability that the PDMS/CeFe2O4/GO achieved the minimum RL of −52 dB with an absorption bandwidth of 2.1 GHz. This work provides a feasible way to deal with the EM pollution in the outdoor environment, which may open up viable prospects for developing multifunctional microwave-absorbing materials.

show abstract

Facile synthesis of Co-embedded porous spherical carbon composites derived from Co3O4/ZIF-8 compounds for broadband microwave absorption

Cited by 78 publications

References 48 publications

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

CeFe₂O₄ Nanoparticle/Graphene Oxide Composites with Synergistic Superhydrophobicity and Microwave Absorption

Contact Info

Product

Resources

About

Facile synthesis of Co-embedded porous spherical carbon composites derived from Co3O4/ZIF-8 compounds for broadband microwave absorption

Cited by 78 publications

References 48 publications

Multifunctional Magnetic Ti3C2Tx MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Multifunctional Magnetic Ti3C2Tx MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

CeFe2O4 Nanoparticle/Graphene Oxide Composites with Synergistic Superhydrophobicity and Microwave Absorption

Contact Info

Product

Resources

About

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

CeFe₂O₄ Nanoparticle/Graphene Oxide Composites with Synergistic Superhydrophobicity and Microwave Absorption