▎ 摘　　要

NOVELTY - Preparation of composite material involves dissolving Co-anderson heteropoly acid in graphene oxide solution at 10-45 degrees C, ultrasonically processing to obtain graphene oxide-doped heteropoly acid solution, transferring the resultant into a reactor, reacting for 12 hours for reducing graphene oxide to obtain a graphene column, removing the resultant column, impregnating with deionized water for 48 hours, removing the free ions in the graphene, drying, mixing the resultant with carbon black and PTFE and grinding. The ratio of graphene to carbon black to PTFE is 8:1:1. USE - Preparation of composite material used for supercapacitor (claimed). ADVANTAGE - The method is simple and industrially produces the composite material by controlling the reaction parameters. The material provides supercapacitor with high stability, excellent specific capacity, and cycle characteristics. DETAILED DESCRIPTION - Preparation of composite material involves dissolving Co-anderson heteropoly acid in graphene oxide solution at 10-45 degrees C, ultrasonically processing at 100-200 W to obtain graphene oxide-doped heteropoly acid solution, transferring the resultant into a high-temperature and high-pressure reactor, reacting for 12 hours for reducing graphene oxide to obtain a graphene column, removing the resultant column, impregnating with deionized water for 48 hours, removing the free ions in the graphene, drying, mixing the resultant with carbon black and PTFE and grinding. The ratio of graphene to carbon black to polytetrafluoroethylene is 8:1:1.