MOFs derived magnetic porous carbon microspheres constructed by core-shell Ni@C with high-performance microwave absorption

doi:10.1016/j.jmst.2021.02.011

Abstract

Abstract:

Lightweight and high-performance are two determining factors for metal-organic-frameworks (MOFs) derived microwave absorbers. However, most of the reported MOFs derived absorbers usually possess high filler loading. Herein, a series of MOFs derived magnetic porous carbon microspheres with tunable diameter and high specific surface area have been synthesized via a pyrolysis process. The synthesized magnetic porous carbon microspheres, constructed by uniformly distributed core-shell Ni@C, exhibit high-performance microwave absorption with a low filler loading of 10 wt%. Considering the mciro-mesoporous structures, matched impedance, strong conductive loss, enhanced dipolar/interfacial polarization as well as strong magnetic coupling network, a minimum reflection loss of -60 dB and an absorption bandwidth of 7.0 GHz can be achieved at 2.6 mm. Moreover, the bandwidth reaches as wide as 10.2 GHz when the thickness is 4 mm. In addition, compared with other MOFs derived absorbers, this work provides us a simple strategy for the synthesis of porous carbon microspheres with lightweight and high-performance microwave absorption for practical applications.

Key words: Metal-organic-frameworks, Carbon microspheres, Magnetic particles, Core-shell structure, Microwave absorption

Sai Gao, Guozheng Zhang, Yi Wang, Xiaopeng Han, Ying Huang, Panbo Liu. MOFs derived magnetic porous carbon microspheres constructed by core-shell Ni@C with high-performance microwave absorption[J]. J. Mater. Sci. Technol., 2021, 88: 56-65.

Figures/Tables 10

Scheme 1. Schematic illustration for the formation process of magnetic porous carbon microspheres.

Fig. 1. SEM images of different Ni-MOF precursors (a-d) and their derived products Ni@C-1(e), Ni@C-2(f), Ni@C-3(g), Ni@C-4 (h).

Fig. 2. TEM and HRTEM images of Ni@C-1(a-c), Ni@C-2(d-f), Ni@C-3(g-i) and Ni@C-4(j-l).

Fig. 3. XRD patterns (a), Raman spectrum (b), N2 adsorption-desorption isotherms (c) and pore size distribution (d) of Ni@C-1, Ni@C-2, Ni@C-3 and Ni@C-4.

Fig. 4. XPS spectra of all samples (a), C 1s spectra (b), N1s spectra (c) and Ni 2p spectra (d) of Ni@C-2.

Fig. 5. Relative complex permittivity (a,b), relative complex permeability (c,d) and tangent loss (e,f) of Ni@C-1, Ni@C-2, Ni@C-3 and Ni@C-4.

Fig. 6. Reflection loss (RL), impedance matching and 2D projection plots of Ni@C-1 (a,b), Ni@C-2 (c,d), Ni@C-3 (e,f) and Ni@C-4 (g,h).

Fig. 7. SRLl and SRLlt values of the magnetic porous carbon microspheres compared with other MOFs-derived carbon composites.

Fig. 8. Cole-Cole plot (a), C0 values (b), magnetic hysteresis loops (c) and attenuation constant (d) of Ni@C-1, Ni@C-2, Ni@C-3 and Ni@C-4.

Fig. 9. Associated microwave absorption mechanism of the magnetic porous carbon microspheres.

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