Hyperelastic, Robust, Fire‐Safe Multifunctional MXene Aerogels with Unprecedented Electromagnetic Interference Shielding Efficiency

Abstract MXene aerogels have shown great potential for many important functional applications, in particular electromagnetic interference (EMI) shielding. However, it has been a grand challenge to create mechanically hyperelastic, air‐stable, and durable enabling effective EMI protection at low concentrations due the difficulties achieving tailorable porous structures, excellent mechanical elasticity, desired antioxidation capabilities of air. Here, facile strategy fabricating composite by co‐assembling cellulose nanofibers during freeze‐drying followed surface encapsulation with fire‐retardant thermoplastic polyurethane (TPU) is reported. Because maximum utilization pore structures MXene, conductive loss enhanced multiple internal reflections, as‐prepared aerogel 3.14 wt% exhibits an exceptionally high shielding effectiveness 93.5 dB, ultra‐high efficiency 2977.71 dB g −1 , tripling values previous works. Owing presence hydrogen bonding TPU elastomer, hyperelastic feature additional strength, stability, superior durability, fire safety. This study provides creating multifunctional applications protection, wearable devices, thermal management, pressure sensing, intelligent monitoring.