▎ 摘　　要

NOVELTY - Preparation of palladium-ruthenium/graphene/foamed nickel composite cathode involves (1) soaking nickel foam in acetone and hydrochloric acid solution, washing, drying to obtain pretreated nickel foam, (2) mixing graphene oxide with distilled water, ultrasonically processing, obtaining graphene oxide dispersion, (3) immersing the pretreated nickel foam in a graphene oxide dispersion liquid at a temperature of 30-80degreesC for 3-10 hours, naturally cooling to room temperature, taking out, using distilled water to wash 3-5 times, drying again, obtaining graphene/nickel foam composite substrate, (4) adding palladium chloride and ruthenium chloride to deionized water, stirring, ultrasonically processing, obtaining palladium chloride/ruthenium chloride mixed solution, (5) immersing the graphene/nickel foam composite substrate into a mixed solution of palladium chloride/ruthenium chloride at 20-60degrees Celsius for 30 minutes to 3 hours, naturally cooling to room temperature, and drying. USE - Preparation of palladium-ruthenium/graphene/foamed nickel composite cathode for magnesium-hydrogen peroxide half-fuel cell (claimed). ADVANTAGE - The method reduces the use amount of noble metal palladium, continuously improves magnesium-hydrogen peroxide semi-fuel cell performance, reduces the battery cost, takes foam metal as substrate, covers the graphene nano-layer on the surface, and modifies palladium-ruthenium nano-particles on surface of graphene to form composite electrode. The electrode keeps the three-dimensional porous structure of the foam metal, it is easier to transport electrolyte and product.