Heterostructure design of MOFs derived Co9S8/FeCoS2/C composite with efficient microwave absorption and waterproof functions

• Published in: Journal of materials science & technology Vol. 129; pp. 15 - 26
• Main Authors: Cheng, Runrun, Wang, Yan, Di, Xiaochuang, Lu, Zhao, Wang, Ping, Wu, Xinming
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2022
• Subjects: Bouquet-like CoFe- MOF; Electromagnetic absorption; Metal-organic frameworks (MOFs); Sulfur doping; Bouquet-like CoFe- MOF; Electromagnetic absorption; Metal-organic frameworks (MOFs); Sulfur doping
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2022.04.031

•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. [Display omitted] 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 Co7Fe3/C and Co9S8/ FeCoS2/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 Co9S8/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 Co9S8/FeCoS2/C composite can be as candidates of high-efficiency absorbers in extreme application environments.