Morphology-controlled CoNi/C hybrids with bifunctions of efficient anti-corrosion and microwave absorption

doi:10.1016/j.jmst.2021.07.003

Abstract

Abstract:

Till now, fewer literatures have investigated the corrosion resistance of microwave absorbers, especially mental@C/carbon matrix derived from MOF composites, although it is known that carbon shells possess a protective effect. Herein, three kinds of morphology-controlled CoNi/C-N doped architectures were successfully fabricated via a sequence of processing, namely coprecipitation for ZIF-67, subsequent Ni²⁺ exchange and ultimate carbonization. Apart from composition characterization, the effects of microstructure tailoring and temperature controlling on electromagnetic response as well as attenuation performance were revealed, where dodecahedron-shaped composites possessed the highest permittivity. By contrast, rod-shaped composites (CoNi/C-r-550 and CoNi/C-r-700) were endowed with superior comprehensive absorption properties, e.g., RL_min:-49.8 dB and-64.0 dB; EAB: 5.7 GHz and 4.8 GHz, respectively. Besides, samples CoNi/C-d-700 and CoNi/C-r-700 present higher corrosion potential (E_corr) and lower corrosion current (I_corr). Hence, these corrosion-resistant microwave absorbers with outstanding absorption stability, wetting effect as well as environmental adaptability, can be used as a candidate/raw material for intelligent devices.

Key words: Electromagnetic response, Morphological-anisotropic, Anticorrosive, ZIF-67

Jianwen Ge, Yu Cui, Jiaxin Qian, Li Liu, Fandi Meng, Fuhui Wang. Morphology-controlled CoNi/C hybrids with bifunctions of efficient anti-corrosion and microwave absorption[J]. J. Mater. Sci. Technol., 2022, 102: 24-35.

Figures/Tables 13

Fig. 1. SEM (a, c, e, g, i, k) and TEM (b, d, f, h, j, l) images of varied ZIF-67 and derived ZIF-67@Ni-Co LDH hybrids with different morphologies. ZIF-67 with leaf-shaped morphology (a, b), rod-shaped morphology (e, f), dodecahedron-shaped morphology (i, j). ZIF-67@Ni-Co LDH hybrids with leaf-shaped morphology (c, d), rod-shaped morphology (g, h), dodecahedron-shaped morphology (k, l). The STEM image (m) and corresponding mapping images (n-r) of ZIF-67@Ni-Co LDH hybrids.

Fig. 2. SEM (a, c, e, g, i, k) and TEM (b, d, f, h, j, l) images of varied CoNi/C composites subjected to 550 and 700 °C thermal treatment, respectively. CoNi/C-l-550 (a, b), CoNi/C-l-700 (c, d), CoNi/C-r-550 (e, f), CoNi/C-r-700 (g, h), CoNi/C-d-550 (i, j), CoNi/C-r-700 (k, l). The STEM image (m) and corresponding mapping images (n-r) of CoNi/C-r-550 composites.

Fig. 3. HRTEM images of CoNi/C-l-550 (a), CoNi/C-l-700 (d), CoNi/C-r-550 (b), CoNi/C-r-700 (e), CoNi/C-d-550 (c), CoNi/C-r-700 (f) and enlarged HRTEM image of CoNi/C-d-550 (g).

Fig. 4. XRD diffraction spectra of ZIF-67 and ZIF-67@CoNi-LDH (a), varied CoNi/C-N doped composites (b). XPS spectra of the CoNi/C-N doped composites: (c) C 1s region, (d) N 1s region, (e) Co 2p region and (f) Ni 2p region.

Fig. 5. Raman spectrum (a), N2 adsorption-desorption isotherms (b), the pore size distribution (c), TG curves (d), field-dependent magnetization (e), and detailed Ms and Hc values (f) of varied CoNi/C composites.

Fig. 6. Water contact angle of CoNi/C-l-550 (a), CoNi/C-l-700 (d), CoNi/C-r-550 (b), CoNi/C-r-700 (e), CoNi/C-d-550 (c), CoNi/C-r-700 (f).

Fig. 7. Reflection losses of different samples with 20 wt%: CoNi/C-l-550 (a, b), CoNi/C-l-700 (c, d), CoNi/C-r-550 (e, f), CoNi/C-r-700 (g, h), CoNi/C-d-550 (i, j) and CoNi/C-d-700 (k, l).

Fig. 8. The summary of RL (a), EAB (b) and detailed RL absorption performance (c) with the thickness of 2.6 mm.

Fig. 9. The magnetism experiment for CoNi/C-r-550 (a), potentiodynamic polarization curves (b) of the six samples and the related Ecorr and Icorr values (c), the electromagnetic parameters (d) of sample CoNi/C-r-550 after soaking in acid solution for one week.

Fig. 10. The real permittivity (a), imaginary permittivity (b), real permeability (d), imaginary permeability (e), tan δε values (c) and tan δμ values (f) of different examples.

Fig. 11. Cole-Cole plots of sample CoNi/C-l-550 (a), sample CoNi/C-l-700 (d), sample CoNi/C-r-550 (b), CoNi/C-r-700 (e), CoNi/C-d-550 (c) and CoNi/C-d-700 (f) (For interpretation of the references to color in this figure, the reader is referred to the web version of this article.).

Fig. 12. C0 values (a), attenuation constant (b) and |Zin/Z0| values (c) of different samples.

Fig. 13. Scheme of primary microwave attenuation process in the CoNi/C-N adopted absorbers.

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