▎ 摘　　要

NOVELTY - Preparing graphene composite selenium and cobalt element counter electrode involves utilizing graphene, cobalt salt, elemental selenium as main raw material, and adding reducing agent and polyvinylpyrrolidone (PVP) catalyst. The 0.291g cobalt nitrate hexahydrate is weighed and dissolved in proper amount of water to obtain 200ml of 5mmol/L cobalt nitrate solution. USE - Method for preparing graphene composite selenium and cobalt element counter electrode for dye-sensitized solar cell (claimed). ADVANTAGE - The method enables to prepare graphene composite selenium and cobalt element counter electrode in simple manner, short reaction, good repeatability, low cost, and obtained thin film has dense structure, uniformly distributed elements, and is suitable for industrial production of electrode. DETAILED DESCRIPTION - Preparing graphene composite selenium and cobalt element counter electrode involves utilizing graphene, cobalt salt, elemental selenium as main raw material, and adding reducing agent and polyvinylpyrrolidone (PVP) catalyst. The 0.291g cobalt nitrate hexahydrate is weighed and dissolved in proper amount of water to obtain 200ml of 5mmol/L cobalt nitrate solution. The 5ml of 5mM cobalt nitrate solution is taken into small beaker, and 0.004g graphene and 0.004g selenium powder are weighed and added into small beaker, and 1mg polyvinylpyrrolidone (PVP) is added to beaker, and 9.9 mg glucose and 2ml hydrazine hydrate are added into a small beaker, and subjected to magnetic stirring for 20 minutes to obtain magnetically stirred material. The fluorine-doped tin oxide or indium tin oxide conductive glass is placed in reactor, and obtain magnetically stirred material is added and stirred into reactor and deionized water is added into it to 3-5th of reactor volume. The reactor is tighten and transferred to a thermostatic oven for 12 hours, and conductive glass sheet is taken out, and washed with anhydrous ethanol and then dried after completion of reaction.