Bimetallic Metal Organic Frameworks Derived Coni@C/Mxene/Cellulose-Derived Carbon Aerogels  for Absorption-Dominated Electromagnetic Interference Shielding

Abstract

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, CoNi@C derived from rod-shaped CoNi-MOFs was selected as magnetic components and MXene was regarded as conductive materials to construct the three-dimensional porous CoNi@C/MXene/cellulose-derived carbon aerogels 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 aerogel achieves an absorption coefficient of 0.59 and a high EMI SE of 50.4 dB when the thickness is 2 mm, 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.

Keywords: CoNi-MOFs, MXene, Carbon aerogel, Electromagnetic interference shielding