The fabrication of high-performance electromagnetic(EM)wave absorption(EMA)materials is an effec-tive strategy to deal with ever-increasing EM pollution.In this work,a series of manganese oxides/porous carbon(MnxOy@C)hybrid composites are obtained by a two-step process.It is revealed that different manganese oxides play various influence on the dielectric properties of absorbers.Owing to the moder-ate complex permittivity of MnO@C hybrid composites,the optimal reflection loss could reach as high as-76.0 dB at the matching thickness of 2.0 mm with 5.2 GHz of effective absorption bandwidth at thick-ness of 2.1 mm.We demonstrated that the addition of porous carbon is vital for enhancing EMA perfor-mance of composites,which not only coordinates impedance matching allowing more EM waves enter the absorber,but also provides the path for electron movement,thus profiting conductive loss.Besides,different heterogeneous interfaces including porous carbon,manganese oxide and so on,are conducive to contribution of interface polarization.The most noteworthy is ingenious design of composite materials and systematic research of EM energy attenuation mechanism in this work will provide the possibility to realize high-performance EMA.

Institute of Materials for Energy and Environment,State Key Laboratory of Bio-fibers and Eco-textiles,College of Materials Science and Engineering,Qingdao University,Qingdao 266071,China;Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education;School of Electrical & Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China

[1]Yue Liu;Xuehua Liu;Xinyu E;Bingbing Wang;Zirui Jia;Qingguo Chi;Guanglei Wu-.Synthesis of MnxOy@C hybrid composites for optimal electromagnetic wave absorption capacity and wideband absorption)[J].材料科学技术（英文版）,2022(08):157-164

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