Heterophasic cobalt sulfide heterogeneous interfaced carbon nanospheres with enhanced electromagnetic wave absorption and thermal insulation performance

作者：Hanwen Zhang, Xuejing Xie, Xiubo Xie, Juan Du, S.B. Al-Shammari, Hamdy Khamees Thabet, Mukun He, Fushan Li, Hua Qiu, Zhanhu Guo, Hassan Algadi, Hideo Kimura, Wei Du, Chuanxin Hou · 发表于：Journal of Material Science and Technology · 年份：2025 · DOI：10.1016/j.jmst.2025.09.054 · 被引用次数：13 · 研究领域：Electromagnetic wave absorption materials、Graphene research and applications、Advancements in Battery Materials

• The heterophasic cobalt sulfide (CoS, Co 9 S 8 , Co 3 S 4 )/carbon nanospheres rich in heterogeneous interfaces was prepared; • Enormous heterogeneous interfaces formed among multiple heterophasic cobalt sulfides and carbon induce dipole and interfacial polarisation; • Excellent EM wave absorption with RL min of -62.68 dB and EAB of 5.44 GHz was obtained; • The EM wave absorption performance was proved by radar reflectance cross section simulation. • Satisfactory thermal insulation performance was achieved by thermal conductivity test. Heterogeneous interfaces can significantly improve interface polarization loss, promote multiple reflections or scatter of incident electromagnetic waves; simultaneously, the mutual diffusion of constituent elements introduces interface states and defects, which results in the asymmetric localized electric field effect and dipole polarization effect, promoting electromagnetic wave (EW) absorption performance. Various cobalt sulfides (Co x S y ) with heterogeneous interfaces formed by the variable stoichiometric ratios of cobalt and sulfide, producing high dielectric loss, which has received considerable attention in the microwave absorption (MA) field. Nevertheless, preparation of Co x S y EW absorbers with a broadened effective absorption bandwidth (EAB) is still a challenge. Herein, the heterophasic cobalt sulfide (CoS, Co 9 S 8 , Co 3 S 4 )/carbon nanospheres rich in heterogeneous interfaces were synthesized. Numerous heterogeneous interfa...