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Frozen Spray-Coating Prepared Graphene Aerogel with Enhanced Mechanical, Electrochemical, and Electromagnetic Performance for Energy Storage

As a significant macrostructure of graphene, graphene aerogel (GA) with three-dimensional (3D) porous structure, good mechanical elasticity, and high electrical conductivity, has been an urgent requirement in the applications. However, the easy-operation, large-scale production of high-quality GA is rarely obtained. Herein, we reported a novel frozen spray-coating technique to prepare a GA sponge mat. It has an ultralarge aspect ratio and large-scale, economical, and practical advantages. The as-prepared samples possess the controllable interconnected pores and integrated conductive networks, which leads to the high specific surface area (SSA) and high elasticity. The conductive framework of GA generates the effective electrical loss, bringing on good electrochemical and electromagnetic performances. Taking all the excellent properties, our GA mat has prominent potential in the fields of pollution absorption, supercapacitors, battery electrodes, electromagnetic shielding, etc.