▎ 摘　　要

Three-dimensional (3D) architectures of graphene and carbon nanotubes (CNTs) were prepared via the in situ self-assembly of graphene oxide and carboxyl-functionalized CNTs by mild chemical reduction and freeze-drying. The prepared 3D architectures exhibited densities of 7.35-9.68 mg/mL and thermal conductivities of 0.0192-0.0414 W/mK. These features were created by a highly porous structure, including millimeter-, micrometer-, and nanometer-scale pores. A number of analytical techniques were used to characterize the 3D architectures of graphene. The highly porous graphene-based aerofoams exhibited low densities, good thermal stabilities, and low thermal conductivities, making them excellent candidates for application in thermal protection materials, as well as in super capacitors and energy storage systems.