▎ 摘　　要

NOVELTY - A manganese oxyhydroxide self-supporting composite electrode preparing method involves placing nickel foam in a crucible, placing crucible in a high temperature tubular furnace, evacuating tubular furnace and introducing argon and hydrogen. The high temperature tube furnace program is set to increase the temperature to 1000 degrees C at a rate of 50 degrees C min-1, after a constant temperature of 10 min, after introducing methane, at constant temperature for 1 hour, closing hydrogen and methane, naturally cooling at room temperature, closing argon to obtain nickel foam/foamed graphene electrode. Mixed solution of 0.1 M sodium sulfate and 0.1 M manganese acetate is utilized as an electrolyte, and the prepared foamed nickel/foamed graphene electrode is utilized as a working electrode, placing dried electrode sheet in a muffle furnace, setting heating rate to 10 degrees C min-1 to 400 degrees, naturally cooling after 6 hours and removing to obtain product. USE - Method for preparing manganese oxyhydroxide self-supporting composite electrode that is utilized as a supercapacitor electrode (claimed). ADVANTAGE - The electrode has high capacity, better rate performance and long cycle stability. DETAILED DESCRIPTION - A manganese oxyhydroxide self-supporting composite electrode preparing method involves placing nickel foam in a crucible, placing crucible in a high temperature tubular furnace, evacuating tubular furnace and introducing argon and hydrogen. The high temperature tube furnace program is set to increase the temperature to 1000 degrees C at a rate of 50 degrees C min-1, after a constant temperature of 10 min, after introducing methane, at constant temperature for 1 hour, closing hydrogen and methane, naturally cooling at room temperature, closing argon to obtain nickel foam/foamed graphene electrode. Mixed solution of 0.1 M sodium sulfate and 0.1 M manganese acetate is utilized as an electrolyte, and the prepared foamed nickel/foamed graphene electrode is utilized as a working electrode, and the platinum sheet is utilized as an auxiliary electrode, and saturated calomel electrode i.e. three-electrode system composed of reference electrode. Cyclic voltammetry is used in electrochemical work, at voltage of 0.5-1.2V, scanning rate of 200 mV/s, and the scanning time of 5 minutes to obtain nickel/foamed graphene/manganese oxyhydroxide followed by washing obtained electrode with water and ethanol, placing in a vacuum drying oven at 80 degrees C for 24 hours, placing dried electrode sheet in a muffle furnace, setting heating rate to 10 degrees C min-1 to 400 degrees, naturally cooling after 6 hours and removing to obtain product. An INDEPENDENT CLAIM is also included for a manganese oxyhydroxide self-supporting composite electrode prepared by the method.