Rational design of hollow bimetallic sulfide@carbon with abundant heterogeneous interfaces and conductive network synergies for efficient microwave absorption

Abstract

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 Co3S4@NiCo2S4@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 (RLmin) 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.