▎ 摘　　要

NOVELTY - Preparing cerium oxide modified nitrogen-doped graphene DSSC counter electrode involves dispersing graphene oxide in solvent by ultrasound to obtain graphene oxide solution A. The ratio of the mass of the graphene oxide to the volume of the solvent is (0.2-2)mg:1mL. The cerium nitrate and cerium ammonium nitrate are added to graphene oxide solution A, ultrasonically dispersed, and reacted at 140-200 degrees C for 12-48 hours to obtain cerium oxide modified nitrogen-doped graphene counter electrode material B. The total mass ratio of cerium nitrate and cerium ammonium nitrate to graphene oxide in graphene oxide solution A is (0.2-2):1. The mass ratio of cerium nitrate to cerium ammonium nitrate is (0.1-4):1. The cerium oxide modified nitrogen-doped graphene counter electrode material B is added in non-aqueous solvent, sonicated for 30-120 minutes, stirred and evaporated to viscous state to obtain cerium oxide modified nitrogen-doped graphene composite slurry C. USE - Method for preparing cerium oxide modified nitrogen-doped graphene DSSC counter electrode. ADVANTAGE - The method enables to prepare cerium oxide modified nitrogen-doped graphene DSSC counter electrode that solves problems of relatively weak electrocatalytic performance of existing nitrogen-doped graphene counter electrodes, and difficult to balance the conductivity and catalytic performance. DETAILED DESCRIPTION - Preparing cerium oxide modified nitrogen-doped graphene DSSC counter electrode involves dispersing graphene oxide in solvent by ultrasound to obtain graphene oxide solution A. The ratio of the mass of the graphene oxide to the volume of the solvent is (0.2-2)mg:1mL. The cerium nitrate and cerium ammonium nitrate are added to graphene oxide solution A, ultrasonically dispersed, and reacted at 140-200 degrees C for 12-48 hours to obtain cerium oxide modified nitrogen-doped graphene counter electrode material B. The total mass ratio of cerium nitrate and cerium ammonium nitrate to graphene oxide in graphene oxide solution A is (0.2-2):1. The mass ratio of cerium nitrate to cerium ammonium nitrate is (0.1-4):1. The cerium oxide modified nitrogen-doped graphene counter electrode material B is added in non-aqueous solvent, sonicated for 30-120 minutes, stirred and evaporated to viscous state to obtain cerium oxide modified nitrogen-doped graphene composite slurry C. The ratio of the mass of the nitrogen-doped graphene to the electrode material B to the volume of the non-aqueous solvent is (0.1mg-3 mg):1mL. The cerium oxide modified nitrogen-doped graphene composite paste C is printed on FTO conductive glass using film-forming technology to obtain cerium oxide modified nitrogen-doped graphene composite counter electrode film D. The cerium oxide modified nitrogen-doped graphene composite counter electrode film D is dried at 40-120 degrees C for 5-15 minutes, and then baked at 450-600 degrees C for 10-20 minutes under the protection of argon, and then cooled at room temperature to obtain final product.