Combination of 1D Ni(OH)2 nanobelts and 2D graphene sheets to fabricate 3D composite hydrogel electrodes with ultrahigh capacitance and superior rate capability

3D Ni(OH)2 nanobelt/graphene composite hydrogels were fabricated by incorporating the pre-synthesized Ni(OH)2 nanobelts into a suspension of graphene oxide followed by hydrothermal treatment. The resulting self-supported electrodes show much better electrochemical performance compared to the powdery Ni(OH)2 nanoparticle/graphene composites prepared by one-pot hydrothermal processing of Ni salts and graphene oxide.474