Highly dispersed Co/Co9S8 nanoparticles encapsulated in S, N co-doped longan shell-derived hierarchical porous carbon for corrosion-resistant, waterproof high-performance microwave absorption

Zhao Lu; Yan Wang; Runrun Cheng; Longqi Yang; Nian Wang

doi:10.1016/j.jcis.2023.01.078

Highly dispersed Co/Co₉S₈ nanoparticles encapsulated in S, N co-doped longan shell-derived hierarchical porous carbon for corrosion-resistant, waterproof high-performance microwave absorption

J Colloid Interface Sci. 2023 May:637:147-158. doi: 10.1016/j.jcis.2023.01.078. Epub 2023 Jan 18.

Authors

Zhao Lu¹, Yan Wang², Runrun Cheng¹, Longqi Yang¹, Nian Wang¹

Affiliations

¹ School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, PR China.
² School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, PR China. Electronic address: wangyan287580632@126.com.

PMID: 36689799
DOI: 10.1016/j.jcis.2023.01.078

Abstract

It is highly desirable, but challenging to develop multifunctional electromagnetic wave (EMW) absorbing material for practical applications in some harsh environments. Herein, we successfully embedded highly dispersed Co/Co₉S₈ nanoparticles into a three-dimensional (3D) honeycomb porous carbon skeleton (the carbon skeleton is derived from longan shell-derived S, N co-doped porous carbon) as a multifunctional material with outstanding EMW absorption properties, hydrophobicity and corrosion resistance. Its superior versatility is attributed to synergistic effects of the S and N dopants, large specific surface area, abundant carbon defects, and 3D porous characteristics. Minimal reflection loss (RL_min) and efficient absorption bandwidth (EAB) of the optimized material as EMW absorbers can achieve -59.9 dB and 6.8 GHz at a thickness of 2.7 mm, respectively, which are superior to most of the reported carbon-based absorbents. Meanwhile, theoretical simulations of the radar scattering cross section (RCS) further confirm that this multifunctional material has outstanding EMW attenuation performance and actual application potential. In addition, the material possesses strong hydrophobicity (124°) and anti-corrosion properties, expanding the scope of potential applications of microwave absorbers. Therefore, this work provides an effective development strategy for the design of anti-corrosion, super-hydrophobic, and high-performance EMW absorbing materials.

Keywords: Corrosion resistance; Electromagnetic wave absorption; Hydrophobicity; Multifunctional material; Radar cross-sectional simulation; Synergistic effect.