In recent years, various methods were used to prepare graphene/NiO composites as electrode materials for supercapacitors. Huang et al.  prepared porous NiO-graphene hybrid film by Poziotinib facile strategy combining the “on-water spreading” method and the chemical bath deposition. Zhao et al.  prepared graphene nanosheet/NiO nanocomposite by using a controlled refluxing and subsequent annealing. Chen et al.  prepared the graphene/nickel oxide (RG/NiO) composites via a hydrothermal route using Ni(NO3)2·6H2O and the as-prepared graphene as starting material.