文献类型：期刊文献

英文题名：Synergistic polarization and conduction loss in hierarchically porous C/Co aerogels for high-performance microwave absorption

作者：Liu, Shuai[1];Dai, Minghan[1];Guo, Shaoli[1];Zhang, Chaochao[1];Li, Shu[1];Cui, Yan[2];Chen, Guoxiang[1]

机构：[1]Xian Shiyou Univ, Coll Sci, Xian 710065, Shaanxi, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：1050

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20260219900047);WOS:【SCI-EXPANDED(收录号:WOS:001659850400001)】；

基金：Acknowledgments This work is supported by the National Natural Science Foundation of China (Grant No.12004301) , the Natural Science Foundation of Shaanxi Province of China (Grant Nos.2025JC-YBMS-540) , the Shaanxi Fundamental Science Research Project for Mathematics and Physics

语种：英文

外文关键词：Cobalt/carbon aerogels; Impedance matching; Interfacial polarization; Electromagnetic wave absorption

摘要：Lightweight microwave absorbers with broadband response and composition-dependent tunability are critical for next-generation electromagnetic protection and stealth technologies. Herein, hierarchically porous cobalt/ carbon (C/Co-X) aerogels were constructed by integrating hollow ZIF-67 particles with chitosan via freeze-drying and subsequent carbonization. By precisely regulating the ZIF-67/TA ratio (20-35 wt%), the electromagnetic parameters, impedance matching behavior, and attenuation mechanisms were systematically tailored. Among these, the C/Co-30 composite achieved an optimal reflection loss of-65.5 dB at 17.5 GHz and an effective absorption bandwidth of 6.32 GHz at an ultrathin thickness of 2.0 mm. Experimental analyses combined with density functional theory (DFT) calculations revealed that the cooperative effect of hollow Co microspheres and a three-dimensional conductive carbon framework simultaneously enhances interfacial polarization, dipole relaxation, and conduction loss, while mitigating impedance mismatch. This study provides new insights into the structure-property relationship of MOF-derived composites and establishes an effective strategy for the rational design of lightweight, high-efficiency electromagnetic wave absorbers.