Developing composites with rational structural design and multicomponent synergistic effects is regarded as a promising strategy for achieving excellent impedance matching and high intensity attenuation performance. Herein, a hierarchical and multifunctional hollow porous CoS@NiCoS@BPC composite with integrated strong microwave absorption (MA) and self-cleaning properties was designed. The resultant composite exhibits remarkable EMW absorption behavior with a minimum reflection loss (RL) of −68.1 dB at 2.3 mm. The multicomponent synergy achieves a satisfactory heterogeneous structure, invoking intense interfacial polarization. Additionally, the residual functional groups and lattice defects induced by S doping further enhance the microwave attenuation. Meanwhile, the hierarchical hollow porous structure facilitates the impedance matching between the absorber and air. Notably, the composite has ideal radar cross-section (RCS) reduction and excellent hydrophobicity, demonstrating its outstanding MA properties as well as the potential applications in complex environment. Therefore, this work provides a novel strategy for the rational design of high-performance absorbers.

中文翻译：

---

合理设计具有丰富异质界面和导电网络协同作用的中空双金属硫化物@碳以实现高效微波吸收

开发具有合理结构设计和多组分协同效应的复合材料被认为是实现优异阻抗匹配和高强度衰减性能的有前景的策略。本文设计了一种具有强微波吸收（MA）和自清洁性能的多级多功能中空多孔CoS@NiCoS@BPC复合材料。所得复合材料表现出显着的 EMW 吸收行为，在 2.3 mm 处的最小反射损耗 (RL) 为 -68.1 dB。多组分协同作用实现了令人满意的异质结构，引起强烈的界面极化。此外，S掺杂引起的残余官能团和晶格缺陷进一步增强了微波衰减。同时，分层中空多孔结构有利于吸波体与空气之间的阻抗匹配。值得注意的是，该复合材料具有理想的雷达截面积（RCS）减小率和优异的疏水性，展示了其出色的MA性能以及在复杂环境中的潜在应用。因此，这项工作为高性能吸波器的合理设计提供了一种新颖的策略。