Controllable synthesis of Ni/NiO@porous carbon hybrid composites towards remarkable electromagnetic wave absorption and wide absorption bandwidth. (10th October 2021)

• Record Type: Journal Article
• Authors: Zhou, Xinfeng; Jia, Zirui; Zhang, Xingxue; Wang, Bingbing; Wu, Wei; Liu, Xuehua; Xu, Binghui; Wu, Guanglei
• Is Part Of: Journal of materials science & technology. Volume 87(2021)
• Page Start: 120
• Page End: 132
• Publication Date: 2021-10-10
• Subjects: Ni/NiO@C hybrid composites -- Nickel proportion -- Multiple-loss mechanism -- Electromagnetic wave absorption efficiency; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.01.073
• Languages: English
• ISSNs: 1005-0302

Abstract

Graphical abstract: Multiple dielectric loss along with magnetic loss mechanisms were responsible for prominent electromagnetic wave absorption capacity. Highlights: The Ni proportion of composites was tuned by varying preparation process. The Ni proportion had a great influence on the electromagnetic wave absorption performance. The composite with optimized Ni content exhibits the remarkable RL value and wide absorption bandwidth. Abstract: The reasonable design of the composition of the composite materials is of great significance to optimized the electromagnetic (EM) wave absorption performance. Herein, the Ni/NiO@C hybrid composites with tunable Ni proportion were successfully synthesized through a two-step process. With the assistance of X-ray diffraction with refinement treatment, the specific proportion of Ni of as-obtained hybrid composites could be obtained. Employing controlling calcination time to adjust the Ni content of Ni/NiO@C hybrid composites, it has been found that the composite carbonized at 500 °C exhibited remarkable EM wave absorption with the minimum reflection loss ( RL min ) of -49.1 dB at 4.9 mm and the widest effective absorption bandwidth ( EAB max ) of 4.56 GHz at 2.1 mm. Moreover, by adjusting the Ni source, the optimal EM wave absorption performance could be achieved. Results illustrated that the N3 PC with the Ni proportion of 13.17 % showed the RL min as low as -51.1 dB at 2.4 mm and the EAB max was 5.12 GHz at 2.7 mm. It is worth noting that this work demonstrates the relevance of the composition and EM wave absorption performance of hybrid composites, which offers a feasible reference for the absorption mechanism of absorber.