Heterostructure design of MOFs derived Co9S8/FeCoS2/C composite with efficient microwave absorption and waterproof functions. (1st December 2022)

• Record Type: Journal Article
• Authors: Cheng, Runrun; Wang, Yan; Di, Xiaochuang; Lu, Zhao; Wang, Ping; Wu, Xinming
• Is Part Of: Journal of materials science & technology. Volume 129(2022)
• Page Start: 15
• Page End: 26
• Publication Date: 2022-12-01
• Subjects: Electromagnetic absorption -- Metal-organic frameworks (MOFs) -- Bouquet-like CoFe- MOF -- Sulfur doping; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2022.04.031
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: A hierarchical Co9S8/FeCoS2/C composite has been designed. Benefiting from the enhanced polarization loss, optimized synergistic effect, and multiscale EMW dissipation paths, Co9S8/FeCoS2/C composite exhibits superior EMW absorption. The bouquet-like architecture formed by many nanorods produces a large number of void spaces and interfaces. The obtained Co9S8/FeCoS2/C composite shows a broad effective bandwidth of 5.1 GHz at a thickness of 2 mm. Graphical abstract: Image, graphical abstract Abstract: At present, the problem of electromagnetic wave (EMW) pollution is critical, and the design of high-performance absorbers is of great significance. Based on the synergy between dielectric and magnetic losses, and between multicomponents in heterostructures, the development of light-weight absorbers with a strong absorption capability and multiple scattering is a promising strategy to achieve high-performance absorbers. In this work, CoFe-MOF precursors with a bouquet-like structure were prepared via the hydrothermal method, and Co7 Fe3 /C and Co9 S8 /Fe/CoS2 /C composites were obtained through a carbonization and sulfuration treatment during the high-temperature pyrolysis process, respectively. The experimental and theoretical results show that the Co9 S8 /FeCoS2 /C composite has a better EMW absorption performance, and its optimal reflection loss (RL) value is -53.9 dB at a low filler loading of 20 wt.%, which is due to the S doping that enhances the interface polarization relaxation process and improves the impedance matching characteristics. Moreover, the Co9 S8 /FeCoS2 /C composite can be as candidates of high-efficiency absorbers in extreme application environments.