Formation of tunable three-dimensional networks of graphene hydrogel via covalent bond

• A simple way to control the structure of three-dimensional graphene.
• Close-cell and open-pore 3D graphene achieved.
• Density of 3D graphene relates temperature and concentration.
• 3D graphene electrodes show high specific capacity and good capability.

Three-dimensional (3D) network of graphene hydrogel (GDH) was obtained by organic synthesis, 1,8-diaminooctane (OMDA) used as the linker. Structure-tunable 3D graphene network, i.e. close-cell structure (GDH-1) and open-pore structure (GDH-2) were achieved via different connection paths between covalent bonds which resulting high specific capacitance and good rate capability.

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