• • Achieved a minimum reflection loss (RL) of -67.84 dB, indicating that over 99.999% of incident EMW energy is absorbed, a critical threshold for stealth and EMI shielding applications.
• • The 3D MXene sponge/NiFe@NC heterostructure exhibits tunable pore architecture, enabling precise impedance matching across specific frequency bands, which is essential for adaptive EMW absorption in dynamic operational environments.
• • The material integrates dielectric and magnetic loss mechanisms (conduction loss, dipole/interface polarization, and magnetic loss) within a lightweight porous network, addressing the density and bandwidth limitations of conventional absorbers.
• • The PU foam-derived 3D skeleton provides exceptional thermal resistance and flame retardancy, ensuring operational stability under high-power or high-temperature conditions, a key requirement for aerospace and 5G infrastructure.