Graphene, characterized by many fascinating properties is the building block for sp2 carbon materials. Considerable efforts have been made to construct macroscopic structure by graphene, and recently, a few reports have demonstrated several approaches to fabricate three-dimensional (3D) nanostructure with macroscale in appearance by graphene oxide sheets using hydrothermal method. Assembling 3D assembly directly from graphene or chemical reduced graphene oxide (RGO) is still hard to achieve due to the lack of functional groups and hydrophilic properties. Herein, we report a novel graphene-based 3D macroassembly with a porous core and layered shell (CSGM) which assembled directly from RGO with the assistance of KMnO4 by a one-pot assembly process. The assembly process is promoted by low-temperature heating below 100 'C at atmospheric pressure and the core and shell structure is formed simultaneously. The size and infrastructure of the assembly can be precisely tuned by changing KMnO4 fraction and GO concentration. This macroassembly shows good conductivity and excellent electrochemical performance.
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