▎ 摘　　要

NOVELTY - Group (a) nitrate and group (b) are added to graphene suspension. Citric acid and phenol polyoxyethylene ether are added and completely dissolved, and aqueous ammonia solution is dripped, to obtain graphene/perovskite precursor solution. The ethanol and perovskite/graphene composite material are ultrasonically-dispersed. The conductive glass and molybdenum film are placed as electrodes in suspension, and direct-current electric field is applied and composite powder particles are deposited on conductive glass surface, to obtain perovskite/graphene composite membrane electrode. USE - Preparation of perovskite/graphene composite membrane electrode used as photoelectrocatalytic electrode. ADVANTAGE - The perovskite/graphene composite membrane electrode is prepared by simple method, without high-temperature sintering process. The perovskite particles are uniformly distributed on graphene sheet layer. During photocatalysis process, a photoproduction electron hole pair is rapidly transferred and photoproduction cavity is prevented, using the perovskite/graphene composite membrane electrode. DETAILED DESCRIPTION - The constant-current oxidation of graphite paper stripping is carried out using graphite paper as an anode, carbon rod as a cathode and concentrated sulfuric acid electrolyte having concentration of 98% at O.2 A for 24 hours, and the electrolyte solution is diluted with distilled water for 10 times. The solution is cooled to room temperature, centrifuged at 12000 rpm, filtered, washed with distilled water to neutral powder and vacuum dried at 50 degrees C and 100 Pa, to obtain graphene oxide powder. The graphene oxide powder is added to distilled water in weight ratio of 1:1000, pH is adjusted with ammonia to 10, and ultrasonically-processed at 150 W for 3 hours. Hydrazine hydrate is added to suspension, and graphene oxide powder is added, heated in water bath at 80 degrees C for 10 hours, washed to neutral, and vacuum dried at 50 degrees C and 100 Pa, to obtain thin graphene material. The graphene material is diluted with distilled water to obtain diluted graphene suspension having graphene concentration of 0.4 mg/mL. Group (a) nitrate and group (b) nitrate in molar ratio of 1:1 are added to graphene suspension, and subjected to ultrasonic dispersion. Citric acid and phenol polyoxyethylene ether in mass ratio of 2:1-3:20 are added and completely dissolved, and aqueous ammonia solution is dripped to adjust pH value to 9, to obtain graphene/perovskite precursor solution. The graphene/perovskite precursor solution is aged at 60 degrees C for 24 hours in water bath, oven-dried at 80 degrees C, and calcined at 400 degrees C for 2 hours, and furnace cooled to room temperature. The calcined powder is placed in vacuum furnace, and heated at 550-650 degrees C for 3 hours with respect to temperature increase rate of 1 degrees C/minute, and cooled to room temperature, to obtain perovskite/graphene composite material. The ethanol with concentration of 0.5-1.5 mg/mL and perovskite/graphene composite material are ultrasonically-dispersed, to obtain stable homogeneous suspension. The conductive glass and molybdenum film are placed as electrodes in suspension, and direct-current electric field of 20-60 V/cm is applied between two electrodes and composite powder particles are deposited on conductive glass surface for 5-10 minutes. The conductive glass is removed and dried under vacuum at 60 degrees C. Chitosan solution with concentration of 1% is sprayed into sediment surface, to obtain perovskite/graphene composite membrane electrode having thickness of deposited layer of 2 mm or less.