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

Abstract 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.