Carbonized Syndiotactic Polystyrene/Carbon Nanotube/MXene Hybrid Aerogels with Egg-Box Structure: A Platform for Electromagnetic Interference Shielding and Solar Thermal Energy Management

摘要

Functionalmaterials for electromagnetic interference (EMI) shieldingare a consistently hot topic in the booming communication engineering,proceeding the development that tends to the multifunctional EMI shieldingmaterials. Herein, a series of carbonized syndiotactic polystyrene/carbonnanotube/MXene (CsPS/CNT/MXene) hybrid aerogels were fabricated forEMI shielding and solar thermal energy conversion purposes. To fabricatethe hybrid aerogels, a porous CNT/MXene framework was initially preparedusing freeze-casting. Subsequently, sPS was infused into the porousstructure, followed by hyper-cross-linking and carbonization of sPSunder an inert atmosphere. The resulting aerogels exhibited a distinctiveegg-box structure, comprising numerous nanofibrous carbon microspheresembedded within the lamellar framework. The mass ratio between CNTand MXene was regulated to identify an optimum aerogel, that is, theCCM-4-6, which exhibited impressive properties including Young'scompression modulus of 0.67 MPa, a water contact angle of 137.6 & PLUSMN;4.1 & DEG;, a specific surface area of 110 m(2) g(-1), an electrical conductivity of 43.0 S m(-1), andan EMI SE value of 40 dB. Meanwhile, phase-change composites werefabricated through encapsulating paraffin wax within the hybrid aerogels.For the CCM-4-6 aerogel, a noteworthy encapsulation ratio was achievedat about 76.7%, along with remarkable latent heat, good thermal reliability,and commendable solar thermal energy conversion capacity. This studypresents a facile route to prepare multifunctional EMI shielding materials.

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