Vegetable-sponge-shaped nickel cobaltate and nickel sulfide graded nano array electrode material

The invention discloses a vegetable sponge-shaped NiCo2O4-coated NixSy graded nano array electrode material, and belongs to the technical field of supercapacitor electrode materials. The preparation method comprises the following steps: putting cobalt nitrate, urea, ammonium fluoride and foamed nickel treated by acid into a reaction kettle for hydrothermal preparation of a NiCo2O4 precursor, annealing in a tubular furnace to obtain nano needle-shaped NiCo2O4, and finally synthesizing an ultrathin two-dimensional nano sheet on a one-dimensional NiCo2O4 nano needle by an electro-deposition method, and finally, the vegetable sponge-shaped NiCo2O4-coated NixSy nano composite array electrode material with one-dimensional and two-dimensional characteristics is formed. The obtained electrode material has excellent electrochemical performance, the specific capacitance can reach 3347 F/g when the current density is 1A/g, and the specific capacitance can still reach 1150 F/g even when the current density reaches 10 A/g