Bamboo-like N-doped carbon tubes encapsulated CoNi nanospheres towards efficient and anticorrosive microwave absorbents

Leilei, Liang; Liu, Zhuo; Xie, Lingling; Chen, Jing-Peng; Jia, Hui; Kong, Qingqiang; Sun, Guohua; Chen, Cheng-Meng

doi:10.1016/j.carbon.2020.08.057

Cited by 70 publications

(20 citation statements)

References 62 publications

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“…Conversely, PMMA@MXene and 2D MXene/Ni only offer limited RL values of −23.8 dB at 2.5 mm and −34.1 dB at 2.7 mm, respectively (Figure a,c). Exhibiting a far superior absorption performance than other reported MXene-based and magnetic materials (Figure , Table S1), ,,,,,− the mechanisms of our 3D PMMA@MXene@Ni lie in the following three parts.…”

Section: Results and Discussionmentioning

confidence: 85%

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

et al. 2021

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Two-dimensional materials, especially the newly emerging MXene, have attracted numerous interests in the fields of energy conversion/storage and electromagnetic shielding/absorption. However, the inherently inevitable aggregation and absence of magnetic loss of MXene considerably limit its electromagnetic absorption application. The introduction of magnetic component and favorable structural engineering are the alternatives to improve the microwave absorption (MA) performance. Herein, we report a spheroidization strategy to assemble double-shell MXene@Ni microspheres, where the commonly lamellar MXene are reshaped into three-dimensional microspheres that provide the substrate for oriented growth of Ni nanospikes. Whereas this structural feature offers massive accessible active surfaces that effectively promote the dielectric loss ability, the introduction of magnetic Ni nanospikes enables the additional magnetic loss capacity. Benefiting from these merits, the synthesized 3D MXene@Ni microspheres exhibit superior MA performance with the minimum reflection loss value of −59.6 dB at an ultrathin thickness (∼1.5 mm) and effective absorption bandwidth of 4.48 GHz. Moreover, the electron holography results reveal that the high-density anisotropy magnetism plays an important role in the improvement of MA performance, which provides an insight for the design of MXene-based materials as high-efficient microwave absorbers.

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Section: Results and Discussionmentioning

confidence: 85%

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

et al. 2021

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“…As displayed in Figure 4b, the typical D-band (1345 cm −1 ) and G-band peaks (1590 cm −1 ) of the carbon material are clearly observed for all samples, and their peak intensity ratio (I D /I G ) presents a gradually increasing trend from 0.87 to 1.06 with increasing calcination temperature from 600 to 800 °C, manifesting the growth of graphite nanocrystals and enhancing the disordered degree of carbon with increasing calcination temperature. 30 However, I D /I G reduces to 0.99 when the calcination temperature reaches 900 °C, revealing the formation of ordered graphitic carbon. Hence, it can be inferred that the calcination temperature is conductive to tune the carbon structure, which will affect its electrical conductivity and dielectric loss capacity.…”

Section: Resultsmentioning

confidence: 98%

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Guo

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Hierarchical electromagnetic wave (EMW) absorption materials with a dielectric−magnetic dual-loss mechanism are promising candidates for highly efficient EMW attenuation. Herein, hierarchical dielectric−magnetic composite hollow carbon fiber@nitrogen-doped carbon/Co (HCF@NC/Co) was successfully synthesized via in situ growth of two-dimensional (2D) Co metal−organic framework (MOF) (ZIF-67) nanosheets on the surface of hollow loofah fiber (HLF), followed by a calcination process, where the aggregation of carbonized MOFs was effectively avoided to construct a homogeneous hierarchical onedimensional structure. Based on the advantages of the carbon/Co dielectric−magnetic dual-loss mechanism that results in good impedance matching and multiple polarization loss arising from the extensive heterointerfaces (e.g., HCF-NC/Co, air−carbon, nitrogen−carbon, and Co−carbon interfaces), dipole active sites (e.g., doped N, Co particle, and crystalline defects in graphitic carbon), and hierarchical porous structures, optimal EMW absorption performance of HCF@NC/Co is achieved through regulating the calcination temperature and filler content, where the HCF@NC/Co calcinated at 700 °C exhibits a minimum reflection loss (RL min ) value of −50.14 dB with only 14% filler loading and 2.25 mm thickness, and the maximum effective absorption bandwidth (EAB max ) also reaches 7.36 GHz. Meanwhile, adjustable EAB can also be achieved by optimizing the sample thickness, making it applicable in a wider frequency region. It is expected that our prepared HCF@NC/Co might shed light on designing lightweight and highly efficient EMW MOF-derived EMW absorbing materials.

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“…Additionally, the 1D structure and network are benecial to create migration and hopping of electrons, thereby endowing spacecharge polarization. 39,40 In Fig. 6b, the 3 00 values of 20 wt% and 30 wt% MoO 2 /NC-TPU composites show a weakening trend with the increasing frequency.…”

Section: Resultsmentioning

confidence: 95%

Construction of one-dimensional MoO₂/NC heteronanowires for microwave absorption

et al. 2022

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Bamboo-like N-doped carbon tubes encapsulated CoNi nanospheres towards efficient and anticorrosive microwave absorbents

Cited by 70 publications

References 62 publications

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Construction of one-dimensional MoO₂/NC heteronanowires for microwave absorption

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Bamboo-like N-doped carbon tubes encapsulated CoNi nanospheres towards efficient and anticorrosive microwave absorbents

Cited by 70 publications

References 62 publications

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti3C2Tx MXene@Ni Microspheres

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti3C2Tx MXene@Ni Microspheres

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Construction of one-dimensional MoO2/NC heteronanowires for microwave absorption

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High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

Construction of one-dimensional MoO₂/NC heteronanowires for microwave absorption