Lightweight Co@MXene/Cellulose-Derived Carbon Aerogel for Electromagnetic Shielding and Absorption Capacity

Developing low-density and high-efficiency electromagnetic shielding material with a high absorption coefficient is of great importance. In this work, we successfully prepared a nanostructured Co@MXene/cellulose-derived carbon aerogel via a simple solution mixing–regeneration, freeze-drying, and pyrolysis process. By regulating the concentration of Co2+, the degree of its dispersion in the cellulose-derived carbon aerogel can be flexibly adjusted to improve the electromagnetic shielding performance. Thanks to the synergistic effect of the porous structure and electric/magnetic coupling loss, the synthesized carbon aerogel exhibits an absorption coefficient of 0.65 and a high electromagnetic interference (EMI) shielding efficiency (SE) of 40.4 dB when the thickness is 2 mm, which achieve both a high SE and an absorption-based shielding mechanism. It provides an effective method for designing high-performance EMI shielding materials with low reflection and strong absorption properties.