Vertically aligned MnO2 nanostructures on carbon fibers with tunable electromagnetic wave absorption performance

Yu, Kejing; Jiang, Shan; Li, Lulu; Qian, Kun; Sun, Jie; Guo, Wenwen; Cai, Xudong; Yu, Kejing

doi:10.1016/j.apsusc.2022.152858

Cited by 31 publications

(3 citation statements)

References 65 publications

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“…In addition, the closed environment with high temperature and high pressure can effectively enhance the close contact between MnO 2 and carbon materials, improve the transmission speed of electrons, and improve the photocatalytic activity of the composite materials to some extent [ 63 , 64 ]. The hydrothermal method is widely used, which can prepare different dimensions and types of MnO 2 -carbon composites [ 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ].…”

Section: Preparation Methods Of Mno 2 -Carbon Comp...mentioning

confidence: 99%

Preparation of MnO2-Carbon Materials and Their Applications in Photocatalytic Water Treatment

et al. 2023

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Water pollution is one of the most important problems in the field of environmental protection in the whole world, and organic pollution is a critical one for wastewater pollution problems. How to solve the problem effectively has triggered a common concern in the area of environmental protection nowadays. Around this problem, scientists have carried out a lot of research; due to the advantages of high efficiency, a lack of secondary pollution, and low cost, photocatalytic technology has attracted more and more attention. In the past, MnO2 was seldom used in the field of water pollution treatment due to its easy agglomeration and low catalytic activity at low temperatures. With the development of carbon materials, it was found that the composite of carbon materials and MnO2 could overcome the above defects, and the composite had good photocatalytic performance, and the research on the photocatalytic performance of MnO2-carbon materials has gradually become a research hotspot in recent years. This review covers recent progress on MnO2-carbon materials for photocatalytic water treatment. We focus on the preparation methods of MnO2 and different kinds of carbon material composites and the application of composite materials in the removal of phenolic compounds, antibiotics, organic dyes, and heavy metal ions in water. Finally, we present our perspective on the challenges and future research directions of MnO2-carbon materials in the field of environmental applications.

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Section: Preparation Methods Of Mno 2 -Carbon Comp...mentioning

confidence: 99%

Preparation of MnO2-Carbon Materials and Their Applications in Photocatalytic Water Treatment

et al. 2023

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“…Among them, birnessite, as a type of manganese oxides, and its hybrids were extensively used as EWA materials due to the relatively simple synthetic process and good microwave-absorbing abilities. [5][6][7][8][9][10] Therefore, birnessite material has been investigated as a green and sustainable absorber for microwave absorption.…”

Section: Introductionmentioning

confidence: 99%

Harnessing Pseudo‐Jahn−Teller Disordering of Monoclinic Birnessite for Excited Interfacial Polarization and Local Magnetic Domains

Huang

Quan

et al. 2023

Small Methods

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The symmetry in a polymorph is one of the most important elements for determining the inherent lattice nature. The MnO2 host tends to high‐symmetry MnO6 octahedra as a result of the electronic structure t2g3eg0 of Mn4+ ions, displaying an ordered structure accompanying with poor polarization loss and limiting its application toward high‐performance microwave absorbers. Here, a pseudo‐Jahn−Teller (PJT) distortion and PJT disordering design with abundant self‐forming interfaces and local magnetic domains in the monoclinic birnessite–MnO2 host is first reported. The PJT distortion can give rise to asymmetric MnO6 octahedra, inducing the formation of interfaces and increased electron spin magnetic moment in the lattice. The resultant birnessite with PJT distortions and PJT disordering delivers an outstanding reflection loss value of −42.5 dB at an ultralow thickness of 1.7 mm, mainly derived from the excited interfacial polarization and magnetic loss. This work demonstrates an effective approach in regulating the lattice structure of birnessite for boosting microwave absorption performance.

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“…Moreover, because of the chemical stability and good designability of MnO 2 , it is easy to combine with other materials and generate interfacial polarization, which is beneficial to further improve the dielectric loss and attenuation of EM waves. MnO 2 composites are gaining increasing attention as MA absorbers. − Yang et al fabricated hierarchical hollow C@MnO 2 composites with hollow carbon spheres as the core and MnO 2 as the shell. The composites obtain an optimal RL of −53.5 dB at 1.5 mm thickness and the corresponding frequency range of RL less than −10 dB achieves 4.8 GHz .…”

Section: Introductionmentioning

confidence: 99%

Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO₂/Ti₃C₂T_x for Efficient Microwave Absorption

et al. 2022

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Although intensive efforts have been devoted to fabricating Ti3C2T x MXene composites for microwave absorption, it remains a great challenge to achieve excellent MA performance at low loading and thin thickness. Herein, a three-dimensional (3D) lightweight hierarchically structured MnO2/Ti3C2T x /RGO composite aerogel with abundant heterointerfaces was fabricated via a hydrothermal and chemical reduction self-assembly method. The RGO aerogel embedded with laminated MnO2/Ti3C2T x provides a lot of heterogeneous interfaces, 3D porous interconnected conductive networks, and reasonable combination of various loss materials for rich interfacial polarization, conductivity loss, multiple reflections and scattering, and good impedance matching. Benefiting from the synergy of different loss mechanisms, the maximum reflection loss (RL) is up to −66.5 dB (>99.9999% energy absorption) at only 10 wt % loading and 2.0 mm thickness, and even at only 1.5 mm thickness, the maximum RL value remains at −36 dB (>99.9% energy absorption). The work provides a promising route to construct 3D hierarchically heterogeneous composite aerogels for efficient MA at thin thickness and low loading.

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Vertically aligned MnO2 nanostructures on carbon fibers with tunable electromagnetic wave absorption performance

Cited by 31 publications

References 65 publications

Preparation of MnO2-Carbon Materials and Their Applications in Photocatalytic Water Treatment

Preparation of MnO2-Carbon Materials and Their Applications in Photocatalytic Water Treatment

Harnessing Pseudo‐Jahn−Teller Disordering of Monoclinic Birnessite for Excited Interfacial Polarization and Local Magnetic Domains

Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO₂/Ti₃C₂T_x for Efficient Microwave Absorption

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Vertically aligned MnO2 nanostructures on carbon fibers with tunable electromagnetic wave absorption performance

Cited by 31 publications

References 65 publications

Preparation of MnO2-Carbon Materials and Their Applications in Photocatalytic Water Treatment

Preparation of MnO2-Carbon Materials and Their Applications in Photocatalytic Water Treatment

Harnessing Pseudo‐Jahn−Teller Disordering of Monoclinic Birnessite for Excited Interfacial Polarization and Local Magnetic Domains

Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO2/Ti3C2Tx for Efficient Microwave Absorption

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Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO₂/Ti₃C₂T_x for Efficient Microwave Absorption