Ni–Co Prussian blue analogue/graphene aerogel: a green synthesis approach for high-performance electromagnetic wave absorption and radar stealth applications

Materials for electromagnetic wave (EMW) absorption are rapidly advancing to meet the growing demand for stealth technology and to mitigate electromagnetic pollution. Herein, we innovatively synthesize a superlight Ni–Co Prussian blue analogue microcube/graphene aerogel (Ni–Co PBA/GA) monolith by hydrothermal reaction and freeze-drying. Compared to individual graphene aerogels, Ni–Co PBA/GA displays better impedance matching and multiple mechanisms for attenuating EMWs. Resultantly, Ni–Co PBA/GA presents outstanding EMW absorption performance, whose minimum refection loss is −62.3 dB at 13.3 GHz and the effective absorption bandwidth reaches 5.6 GHz. With the detection Phi of 0°, the simulated radar cross-section reduction of Ni–Co PBA/GA reaches −36.8 dB m2, demonstrating the potential radar-evading ability in the actual far field. Ni–Co PBA/GA may be a promising candidate for a superlight, ecofriendly and high-performance EMW absorption material in the future.