▎ 摘　　要

NOVELTY - Graphene-modified tin dioxide electrocatalyst comprises graphene and tin dioxide at 0.1-2.5:1000 mass ratio. USE - Graphene-modified tin dioxide electrocatalyst. ADVANTAGE - The preparation of electrocatalyst is simple with low cost; and protects graphene to a maximum degree. The electrocatalyst has greatly improved catalytic efficiency and stable property; and can be reused. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene-modified tin dioxide electrocatalyst comprising: (A) preparing graphene-stannic chloride sol by adding 0.5-15 mg graphene into 20-100 ml of 5-40 mass% stannic chloride solution; uniformly shaking the solution and ultrasonically dispersing for 20-30 minutes; stirring the solution with a constant temperature magnetic heating stirrer; and dropping 0.3-5 mol/L ammonia water at 20-30 drops/minute during the stirring operation until colorless and transparent graphene-stannic chloride sol is obtained; and (B) preparing the catalyst by standing and aging the graphene-stannic chloride sol for 10-18 hours; drying at 30-60 degrees C; placing into a muffle furnace; baking at 400-600 degrees C for 2-4 hours; after the furnace is cooled at room temperature, grinding the materials in a mortar; and screening the materials through a 100-mesh screen to obtain graphene-modified tin dioxide electrocatalyst.