▎ 摘　　要

NOVELTY - Preparing composite material involves mixing porous carbon and graphene oxide at 0-5 degrees C to obtain mixed solution. The obtained mixed solution is added with porous carbon substances, which is ammonium persulfate and reacted. The reacted product is washed with de-ionized water to obtain porous carbon-coated graphene composite material. The obtained porous carbon-coated graphene composite material is added with D-22 nitrogen with stirring, then added polytetrafluoroethylene liner hydrothermally. USE - Method for preparing composite material (claimed). ADVANTAGE - The method enables to prepare composite material, which has excellent performance. DETAILED DESCRIPTION - Preparing composite material involves mixing porous carbon and graphene oxide at 0-5 degrees C to obtain mixed solution. The obtained mixed solution is added with porous carbon substances, which is ammonium persulfate and reacted. The reacted product is washed with de-ionized water to obtain porous carbon-coated graphene composite material. The obtained porous carbon-coated graphene composite material is added with D-22 nitrogen with stirring, then added polytetrafluoroethylene liner hydrothermally. The treated hydrothermal product is cooled naturally to obtain D-22 nitrogen doped porous carbon coated graphene composites material.