▎ 摘　　要

NOVELTY - White precipitate comprising potassium persulfate, phosphorus pentoxide and graphite, and yellow precipitate comprising sulfanilic acid, sodium hydroxide solution and sodium nitrite are added to water and reacted. Hydrazine hydrate is added to mixture and applied to indium-tin oxide glass, and the mixture is added to electrolyte solution. Dissolved product comprising 3,4-ethylenedioxythiophene-styrene sulfonic acid as supporting electrolyte and sulfonated graphene/manganese dioxide as working electrode are reacted, to obtain three-phase composite electrode. USE - Preparation of sulfonated graphene/manganese dioxide/poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid three-phase composite electrode used for vanadium battery. ADVANTAGE - The method enables preparation of sulfonated graphene/manganese dioxide/poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid three-phase composite electrode with suppressed etching characteristics, and provides battery having excellent durability and safety. DETAILED DESCRIPTION - Predetermined amount of potassium persulfate and phosphorus pentoxide are weighed and dissolved in concentrated sulfuric acid. Graphite is added to mixture, reacted at 80 degrees C for 4-5 hours, cooled to room temperature, filtered and dried, to obtain solid (a). The solid (a) and concentrated sulfuric acid are mixed and reacted at 0-5 degrees C. Potassium permanganate is added to mixture such that the molar ratio of potassium permanganate and mixture is 1:1 and reacted for 2-3 hours. Predetermined amount of hydrogen peroxide is added to mixture, to obtain yellow precipitate. The yellow precipitate is filtered and dried. Weighed predetermined amount of sulfanilic acid is dissolved in predetermined amount of 2 %mass sodium hydroxide solution, reacted at 0 degrees C and sulfanilic acid is added to mixture such that the mass ratio of sodium nitrite and sulfanilic acid is 2:1. Aminobenzenesulfonic acid and hydrochloric acid in molar ratio of 20:1 are added to solution and reacted, to obtain white precipitate. The white precipitate is filtered and dried. The yellow precipitate and sodium borohydride in molar ratio of 1:1.5 are evenly mixed with water, to obtain white precipitate. White precipitate and yellow precipitate in mass ratio of 1:1.2 are added to water, reacted at less than 0 degrees C for 5-6 hours and pressed. Hydrazine hydrate is added to mixture such that the molar ratio of hydrazine hydrate and yellow precipitate is 1:1 and processed to obtain sulfonated graphene dispersion. The sulfonated graphene dispersion is uniformly applied to indium-tin oxide glass, and the mixture is added to electrolyte solution of 0.1 mol/L manganese sulfate. Sulfonated graphene electrode as working electrode, silver/silver chloride as reference electrode, platinum wire as counter electrode are deposited at room temperature and 1 V for 5-6 minutes, to obtain sulfonated graphene/manganese dioxide composite electrode. 0.05 mol/L 3,4-Ethylenedioxythiophene-styrene sulfonic acid is dissolved in 0.1 mol/L sodium sulfate solution to form dissolved product as supporting electrolyte, sulfonated graphene/manganese dioxide as working electrode and silver/silver chloride as reference electrode and platinum wire as counter electrode are reacted at room temperature and 1 V for 5-6 minutes, to obtain sulfonated graphene/manganese dioxide/poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid three-phase composite electrode.