▎ 摘　　要

The production of 3D graphene-based materials is an alternative to retain the intrinsic properties of 2D graphene, and improve others like specific surface area, porosity, mechanical properties, etc. For practical applications such as electrochemical sensors, the production of electroactive 3D graphene-based composites in one single step with good processability and electrochemical response is extremely desirable. Here, we synthesize 3D composites of crumpled graphene (CG) decorated by copper-based nanoparticles in dry state form without further steps. The aerosol-assisted capillary compression strategy adopted results in copper-based nanoparticles directly connected to CG. The carbon nanostructure controls the nucleation and growth of nanoparticles during capillary compression. We explored the application of the composites as an electrochemical sensor for hydrogen peroxide, and it connects the best performance to the synergism between crumpled graphene and the copper-based nanoparticles.