Abstract:

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.

Key words: Prussian blue analogues, Electromagnetic wave absorption, Electrostatic self-assembly, Heterostructure, Synergistic effect