▎ 摘　　要

NOVELTY - Preparing platinum-tin dioxide modified N-doped porous graphene ethanol fuel cell catalyst involves adding graphene oxide to deionized water, uniformly dispersing by ultrasonic, placing in hydrothermal reaction device, reacting at 160-200 degrees C for 12-18 hours, washing the obtained graphene oxide hydrogel and placing in concentrated potassium hydroxide aqueous solution. The mass ratio of graphene oxide and potassium hydroxide is 3-5:100. The activation treatment is performed for 18-36 hours at 100-120 degrees C, then filtered, washed and dried. The dried product is placed in atmosphere tube furnace, calcinated under nitrogen atmosphere at 750-850 degrees C for 1-3 hours, filtered, washed and dried to obtain porous graphene. The porous graphene is added to ethanol, dispersed uniformly by ultrasonic, then melamine is added to the mixed solution, stirred well and placed in water bath, heated to 70-90 degrees C and stirred under reflux. USE - Method for preparing platinum-tin dioxide modified N-doped porous graphene ethanol fuel cell catalyst. ADVANTAGE - The method enables to prepare platinum-tin dioxide modified N-doped porous graphene ethanol fuel cell catalyst that reduces catalyst poisoning, increases the maximum oxidation peak current density of the catalyst and enhances catalytic performance of ethanol fuel cells. DETAILED DESCRIPTION - Preparing platinum-tin dioxide modified N-doped porous graphene ethanol fuel cell catalyst involves adding graphene oxide to deionized water, uniformly dispersing by ultrasonic, placing in hydrothermal reaction device, reacting at 160-200 degrees C for 12-18 hours, washing the obtained graphene oxide hydrogel and placing in concentrated potassium hydroxide aqueous solution. The mass ratio of graphene oxide and potassium hydroxide is 3-5:100. The activation treatment is performed for 18-36 hours at 100-120 degrees C, then filtered, washed and dried. The dried product is placed in atmosphere tube furnace, calcinated under nitrogen atmosphere at 750-850 degrees C for 1-3 hours, filtered, washed and dried to obtain porous graphene. The porous graphene is added to ethanol, dispersed uniformly by ultrasonic, then melamine is added to the mixed solution, stirred well and placed in water bath, heated to 70-90 degrees C and stirred under reflux. The dried mixture is placed in atmosphere tube furnace, sintered at 650-750 degrees C for 1-3 hours under nitrogen atmosphere, washed and dried to obtain N-doped porous graphene. The sodium hydroxide, tin dichloride, and N-doped porous graphene are added to deionized water, stirred, placed in hydrothermal reaction device, reacted at 140-180 degrees C for 6-8 hours, cooled, filtered, washed and dried. The dried product is placed in atmosphere tube furnace, heat-treated under nitrogen atmosphere at 400-500 degrees C for 6-8 hours, and cooled to obtain tin dioxide nanowires modified N-doped porous graphene. The H2PtCl6, tin dioxide nanowires are added to ethylene glycol to modify the N-doped porous graphene, ultrasonically dispersed uniformly, sodium hydroxide solution is added dropwise. The pH of the solution is adjusted to 9-11, then dispersed uniformly by ultrasonic again, passed the mixed product through microwave reaction, heated for 15-25s at 160-180 degrees C, stop microwave reaction for 5-15s, repeated the above process 5-7 times, cooled, filtered, washed and dried to obtain platinum-tin dioxide modified N-doped porous graphene.