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Graphene and its derivatives have attracted much attention in application of electrochemical devices. Construction of three-dimensional (3D) heterostructured composites is promising for establishing high-performance devices, which enables large surface area, facilitated ion and electron transport, and synergistic effects between multicomponents. Here, we report a simple and general sonochemical-assisted synthesis to prepare various 3D porous graphene/nanoparticle (i.e., Pt, Au, Pd, Ru, and MnO₂) foams using colloidal template. The 3D porous network structure of composite foams significantly improves a large surface area of around 550 m² g^–1 compared to the bare graphene (215 m² g^–1). This unique structure of 3D graphene/MnO₂ enables further improvement of electrochemical characteristics, compared with bare graphene/MnO₂ composite, showing a high specific capacitance of 421 F g^–1 at 0.1 A g^–1 …