▎ 摘　　要

NOVELTY - A nickel oxide/graphene composite electrode involves pre-treating a foam nickel current collector and cut square of nickel foam into certain size, ultrasonically washing cut nickel foam with acetone and hydrochloric acid, adding a certain amount of graphene oxide into certain pH value of phosphate-buffered saline buffer solution, and dispersing to obtain stable and uniform graphene oxide suspension, followed by taking the suspension as electrolyte and the pre-treated foamed nickel collector as working electrode and constructing a three-electrode system to obtain reduced graphene. USE - Method for preparing a nickel oxide/graphene composite electrode for use in a super capacitor (claimed). ADVANTAGE - The method enables preparing the nickel oxide/graphene composite electrode with better energy storage properties. DETAILED DESCRIPTION - A nickel oxide/graphene composite electrode involves pre-treating a foam nickel current collector and cut square of nickel foam into certain size, ultrasonically washing cut nickel foam with acetone and hydrochloric acid for certain time, drying by nitrogen, uniformly adding a certain amount of graphene oxide in certain pH value of phosphate-buffered saline buffer solution, and uniformly dispersing to obtain stable and uniform graphene oxide suspension, followed by taking the suspension as electrolyte and the pre-treated foamed nickel collector as working electrode, constructing a three-electrode system to obtain reduced graphene on the foam nickel current collector surface by potentiostatic method to construct graphene-modified electrode, preparing nickel nitrate solution by using pH 4.0 acetic acid solution as electrolyte and the graphene modified electrode as working electrode, establishing three electrode systems and a modified electrode surface electro-deposition to obtain intermediate graphene by cyclic voltammetry, changing the electrolyte of pH 7 of phosphate-buffered saline solution and re-setting cyclic voltammetric deposition condition on the surface of the electrode to obtain nickel oxide nano sheet. The nickel oxide nano sheet is removed and dried to obtain nickel oxide/graphene composite electrode by using potassium hydroxide solution as electrolyte and the nickel oxide/graphene composite electrode as working electrode. The three-electrode system is constructed to study cyclic voltammetry at different scan rates, constant current charge and discharge test at different current densities, and charging and discharging test under high current density.