Lightweight Three-Dimensional Cellular MXene Film for Superior Energy Storage and Electromagnetic Interference Shielding

A three-dimensional (3D) cellular MXene (Ti3C2Tx) film is fabricated through the filtration assembly of MXene microgels and a subsequent freeze-casting process. Fully exposed MXene nanosheets create a high-ion-accessible surface area, and the highly interconnected MXene networks facilitate ion transport, which enable the 3D cellular MXene film to acquire a high-rate energy storage. Moreover, the continuous conductive porous structure endows such film with a superior absolute electromagnetic interference shielding effectiveness (127083 dB cm(2) g(-1)). This work provides a facile strategy for building a 3D macroporous MXene film and opens up the opportunities to explore the other uses of MXene.