Figure 1
Schematic illustrations displaying the preparation process of 3D-GMOs.
(a) A photograph of green NiCl2·6H2O crystal precursors. (b) SEM image of porous cross-linked Ni catalysts after the reduction process. (c) SEM image of tightly cross-linked Ni catalysts covered by graphene layers. (d) SEM image of honeycomb-like graphene layers of the 3D-GMOs after etching Ni catalysts with FeCl3/HCl solution.
