Hetero-Interface Engineering on 9.0 wt% CoO_x-Doped CeO₂ Nanorods as Electromagnetic Wave Absorber and Integrated into...

Ceria (CeO₂) becomes a promising candidate as electromagnetic wave absorbing materials (EWAMs) for their abundant natural source, rich oxygen vacancy, charge conversion, and electron transfer abilities. However, it remains challenging to regulate its nanoscale and atom-scale composition to optimize the absorbing performance and develop high-performance commercial devices. Herein, a facile method to large-scale synthesis CeO₂@Co-x% (x = 5, 7, 9, 11, 13) series EWAMs with diverse amounts of decorated CoO_x is presented. By modulating the ratio of doped CoO_x, a rational hetero-interface is created in CeO₂@Co-9% to enhance natural and exchange resonances, improving magnetic loss capability and optimizing impedance matching. Doped CoO_x promotes the charge accumulation, interfacial polarization, and multiple scattering of the CeO₂ for strengthening the EW absorption and attenuation, which display superb minimum reflective loss (RL_min) of -74.4 dB with a wide effective absorbing bandwidth (EAB) of 5.26 GHz. Furthermore, a dual crosslinking strategy is employed to fabricate CeO₂@Co-9% into an aerogel device with integrated lightweight, heat insulation, compression resistance, and fame-retardant functions. This work presents an excellent example of large-scale fast synthesis of high-performance CeO₂-based EWAMs and multiplication 3D devices.