▎ 摘　　要

NOVELTY - Graphene modified hydrothermal synthesis composite electrode preparation involves dissolving cerium nitrate hexahydrate and ruthenium (III) chloride powders in ethanol solution respectively, and then mixing the cerium (III) nitrate solution and the ruthenium (III) chloride solution to obtain a mixed solution containing ruthenium-cerium metal ions. An aqueous ammonia solution is added to the obtained mixed solution to adjust pH value, put into a constant temperature water bath under heating and stirring, and then transferring into a hydrothermal reaction kettle for reacting at a certain temperature to obtain a precipitated substance. USE - Method for preparing graphene modified hydrothermal synthesis composite electrode used as working electrode for photoelectrocatalytic degradation of mixed solution of methyl orange and sodium sulfate (claimed). ADVANTAGE - The method prepares the graphene modified hydrothermal synthesis composite electrode in a simple, cost-effective and eco-friendly manner with improved conductivity and photocatalytic performance, and great practical application value. DETAILED DESCRIPTION - Graphene modified hydrothermal synthesis composite electrode preparation involves dissolving cerium nitrate hexahydrate and ruthenium (III) chloride powders in ethanol solution respectively, and then mixing the cerium (III) nitrate solution and the ruthenium (III) chloride solution to obtain a mixed solution containing ruthenium-cerium metal ions. An aqueous ammonia solution is added to the obtained mixed solution to adjust pH value, put into a constant temperature water bath under heating and stirring, and then transferring into a hydrothermal reaction kettle for reacting at a certain temperature to obtain a precipitated substance. The obtained precipitated material is added into a centrifuge, washed with ethanol and distilled water respectively, put in an oven at a certain temperature to dry, and then ground in an agate mortar to obtain a solid powder. The obtained powder is dissolved in ethanol to prepare a solution with a certain concentration, then then ultrasonically stirred for a period of time. Graphene is added to the obtained solution with stirring ultrasonically to make uniform solution. The obtained mixed solution is uniformly coated on a rust-removing and degreasing titanium plate, dried under an infrared lamp, placed in a muffle furnace at a certain temperature for pre-oxidation for a period of time. The obtained sample is put in a muffle furnace at a certain temperature for annealing to obtain the graphene modified hydrothermally synthesized composite electrode.