Bimetallic MOF-derived Co/Ni@C and MXene co-decorated cellulose-derived carbon foams for absorption-dominated electromagnetic interference shielding

Metal−organic framework (MOF)-derived magnetic porous carbon not only have excellent magnetic loss, but also can construct various nanostructures through appropriate design to enhance electromagnetic waves (EMWs) absorption. Herein, magnetic porous carbon (Co/Ni@C) derived from rod-shaped Co/Ni-MOFs was selected as magnetic components and MXene was regarded as conductive materials to construct the three-dimensional porous Co/Ni@C/MXene/cellulose-derived carbon foams via a simple solution mixing-regeneration, freeze-drying process and a facile pyrolysis strategy. Due to the electric/magnetic coupling loss and the interfacial polarization loss caused by multi-interface architecture, the synthesized carbon foam achieves an absorption coefficient of 0.54 and a high EMI SE of 70.4 dB, which enhances the electromagnetic shielding performance without damaging the high absorption coefficient. This work provides a basis for the preparation of electromagnetic shielding composite materials with multi-interface structures to achieve efficient EMI SE and superior absorption coefficients.