▎ 摘　　要

NOVELTY - Composite catalyst comprises graphene oxide and NixCo1-xOOH, where x is 0.5-0.9. USE - Composite catalyst used for preparing an oxygen evolution anode, that is used in the electrolysis of water (claimed). ADVANTAGE - The composite catalyst has a special structure, high specific surface area and high activity, and exhibits excellent oxidative, photoelectrochemical and electrocatalytic activity. DETAILED DESCRIPTION - A method for preparing a composite catalyst, which involves: (A) dissolving a certain concentration of nickel nitrate and cobalt nitrate precursors in deionized water, introducing high-purity nitrogen gas to remove dissolved oxygen and carbon dioxide, adding a certain amount of potassium hydroxide and bromine solution dropwise and reacting, transferring to the reaction in the hydrothermal reactor, and cooling naturally to obtain a product; and (B) mixing graphene oxide solution with the product, placing in a stainless steel high-pressure reaction vessel lined with Teflon, heating the reaction vessel and pressurizing to obtain a floc, which remained doped in a static state, washing it multiple times with large amount of deionized water and drying to obtain a composite catalyst.