▎ 摘　　要

NOVELTY - Graphene-coated high-entropy oxide nanoparticle catalyst preparation method involves mixing the mesoporous carbon and the mixed metal salt solution and then drying to obtain a mixture of the metal salt and the mesoporous carbon. The metal elements in the mixed metal salt solution include five of iron, cobalt, nickel, chromium, vanadium, titanium, copper, and manganese and the molar amounts of each metal element are equal. The mixture of the metal salt and the mesoporous carbon is spread on the surface of the carbon cloth, and the carbon cloth is heated by Joule, so that the metal salt and the mesoporous carbon react to obtain a graphene-coated high-entropy oxide nanoparticle catalyst. USE - Preparation method of graphene-coated high-entropy oxide nanoparticle catalyst used in electrolytic water reaction such as electrolytic water oxygen evolution reaction, an electrolytic water hydrogen evolution reaction or total water splitting reaction (all claimed). ADVANTAGE - The preparation method is simple, quick and efficient, and the prepared graphene-coated high-entropy oxide nanoparticle catalyst exhibits excellent electrocatalytic performance in oxygen evolution, hydrogen evolution and total water splitting reactions in electrolyzed water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows a transmission electron micrograph of the G@(FeCoNiCrV)Ox catalyst.