Core–shell hybrid nanowires with Co nanoparticles wrapped in N-doped porous carbon for lightweight microwave absorption

2019 ◽  
Vol 48 (40) ◽  
pp. 15263-15271 ◽  
Author(s):  
Huanqin Zhao ◽  
Yan Cheng ◽  
Yanan Zhang ◽  
Zhu Zhang ◽  
Lei Zhou ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Porous Carbon ◽  
High Performance ◽  
Core Shell ◽  
One Dimensional ◽  
Co Nanoparticles

One-dimensional core–shell structured nanowires with Co nanoparticles wrapped in N doped porous carbon were designed as a lightweight, thin and high-performance electromagnetic absorber.

scholarly journals Large-scale preparation of Co nanoparticles as an additive in carbon fiber for microwave absorption enhancement in C band

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Y. X. Zhu ◽  
S. F. Wang ◽  
Y. S. Zhang ◽  
Z. G. Wu ◽  
B. Zhong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Carbon Nanofibers ◽  
Porous Carbon ◽  
Carbon Nanofiber ◽  
Absorption Enhancement ◽  
Core Shell ◽  
Form Complex ◽  
The Core ◽  
Microwave Absorbing ◽  
Co Nanoparticles

AbstractRecent studies have found that the core–shell structured metal nanoparticles and porous carbon nanofibers (PCNF) are combined into a microwave absorbing material through electrospinning, which exhibits excellent microwave absorption performance. In this study, the core–shell structure Co nanoparticles prepared by the self-developed HEIBE process (production rate of > 50 g/h) were combined with porous carbon fibers, and their absorbing properties were greatly improved. The morphology of Co/PCNF demonstrated that CoNPs are randomly dispersed in the porous carbon nanofibers and carbon nanofiber form complex conductive network which enhances the dielectric loss of the materials. Meanwhile, the Co/PCNF has a low graphitization and shows a significant improvement in permittivity due to the combination of CoNPs and high conductivity of carbon material. The maximum reflection loss (RL) of Co/PCNF reaches − 63.69 dB at 5.28 GHz with a thickness of 5.21 mm and the absorption bandwidth (RL ≤  − 10.0 dB) is 12.92 GHz. In terms of 5.60 mm and 6.61 mm absorber, there are two absorption peaks of − 47.64 dB and − 48.30 dB appear around 12.50 GHz and 14.10 GHz, respectively. The results presented in this paper may pave a way for promising applications of lightweight and high-efficiency microwave absorbing materials (MAMs).

Hierarchical CNT@NiCo2O4 core–shell hybrid nanostructure for high-performance supercapacitors

2014 ◽  
Vol 2 (29) ◽  
pp. 11509-11515 ◽  
Author(s):  
Feng Cai ◽  
Yiran Kang ◽  
Hongyuan Chen ◽  
Minghai Chen ◽  
Qingwen Li
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Deposition Process ◽  
Core Shell ◽  
Hybrid Nanostructure ◽  
One Dimensional

Ultrathin NiCo2O4 nanosheets directly grown on one-dimensional CNTs, as high-performance electrode materials for supercapacitors, were synthesized through a facile chemical co-deposition process combined with post-calcination in air.

scholarly journals Facile Synthesis of Cobalt-Doped Porous Composites with Amorphous Carbon/Zn Shell for High-Performance Microwave Absorption

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 330 ◽  
Author(s):  
Qilei Wu ◽  
Huihui Jin ◽  
Bin Zhang ◽  
Siqi Huo ◽  
Shuang Yang ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Amorphous Carbon ◽  
Porous Carbon ◽  
High Performance ◽  
Impedance Matching ◽  
Broad Band ◽  
Matching Condition ◽  
Carbon Composite ◽  
Absorption Capacity ◽  
Zeolitic Imidazolate Framework

A facile method for the preparation of microwave absorbers with low density, high microwave absorptivity, and broad band is of paramount importance to the progress in practical application. Herein, commonly-used metal organic frameworks (MOFs) prepared just by mechanical stirring in methanol at room temperature were chosen as sacrificial templates to synthesize porous carbon composites with tunable dielectric and magnetic properties. With the replacement of Co atoms on the surface of zeolitic imidazolate framework-67 (ZIF-67) by Zn atoms, a Co-doped porous carbon composite with a low-dielectric amorphous carbon/Zn shell was constructed after annealing, leading to excellent impedance matching condition. Consequently, the as-obtained composite (Co/C@C-800) shows marvelous microwave absorption properties with an absorption capacity of −43.97 dB and a corresponding effective absorption bandwidth of 4.1 GHz, far exceeding that of the traditional porous carbon and composites directly derived from ZIF-67. The results provide a convenient way to modify MOFs for enhanced microwave absorption materials from the synergy of dielectric and magnetic losses.

Core@shell β-FeOOH@polypyrolle derived N, S-codoped Fe3O4@N-doped porous carbon nanococoons for high performance supercapacitors

2019 ◽  
Vol 480 ◽  
pp. 582-592 ◽  
Author(s):  
Maiyong Zhu ◽  
Qi Chen ◽  
Jingjing Tang ◽  
Wenjing Wei ◽  
Songjun Li
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Core Shell

Designing one dimensional Co-Ni/Co3O4-NiO core/shell nano-heterostructure electrodes for high-performance pseudocapacitor

2014 ◽  
Vol 104 (13) ◽  
pp. 133904 ◽  
Author(s):  
Ashutosh K. Singh ◽  
Debasish Sarkar ◽  
Gobinda Gopal Khan ◽  
Kalyan Mandal
Keyword(s):  
High Performance ◽  
Core Shell ◽  
One Dimensional
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