Electrostatically induced dual-coupled interfaces of defect polarization enhanced PBA/MXene heterostructures for boosting electromagnetic wave absorption

Prussian blue analogues (PBAs) offer tunable coordination frameworks and intrinsic porosity, yet their limited structural robustness and attenuation capability restrict the performance of PBA-derived electromagnetic wave (EMW) absorbers. These drawbacks can be substantially mitigated in metal-carbon heterostructure systems, yet achieving well-defined multi-component heterogeneous interfaces and controllable magnetic-domain behavior remains challenging. Here, we propose an electrostatic-field self-assisted strategy to construct bimetallic PBA-derived multi-type carbon-encapsulated/MXene (NiCo@C@C/MXene) heterostructures with precisely engineered multi-component interfaces, which create a rich landscape of electrostatically induced dual-coupled interfaces acting as a core mechanism for enhancing dielectric loss. MXene nanosheets and PDA coating reinforce the PBA-derived carbon matrix and form multidimensional conductive pathways, while multi-type carbon matrix, defect porosity, and magnetic nanoparticles collectively enhance interfacial polarization and magnetic loss. The resulting synergy yields optimized impedance matching, strong attenuation, and broadband absorption, enabling the material to achieve a minimum reflection loss (RL) of −58.51 dB and an effective absorption bandwidth (EAB) of 5.44 GHz at an ultrathin thickness of only 1.57 mm. Radar cross-section simulations further reveal domain-coupling networks that intensify EMW dissipation. This work establishes a concise route to address intrinsic PBA limitations and interface-engineering challenges, enabling next-generation high-performance EMW attenuation materials. Using an electrostatic-field self-assisted strategy, bimetallic PBA-derived multi-type carbon-encapsulated/MXene heterostructures were successfully constructed. The electrostatically induced dual-coupled interfaces enabled precise microscopic regulation of interfacial polarization and magnetic domain behavior. At the nanoscale, the synergistic optimization of dielectric loss, magnetic loss, and impedance matching was achieved, offering a concise approach to overcoming the intrinsic limitations of PBAs and providing a theoretical basis for the rational design of next-generation high-performance electromagnetic wave attenuation materials. Download: Download high-res image (325KB) Download: Download full-size image