▎ 摘　　要

NOVELTY - Preparing three-dimensional nitrogen-doped graphene involves taking poly 2,5-benzimidazole (ABPBI) as carbon and nitrogen source and ferric hydroxide and iron oxide (Fe2O3) nanoparticles as template, mixing to keep the aromatic ring in the same plane and pyrolyzing under the protection of inert gas. The dilute acid solution is added to remove the template to obtain three dimensional nitrogen-doped graphene, where the ABPBI is soluble, rich in nitrogen-containing imidazole ring and terminal ammonia, and its benzimidazole ring is rigid aromatic ring. USE - Method for preparing three-dimensional nitrogen-doped graphene used as catalyst catalytic oxygen reduction and for catalyzing the electrolysis of water and oxygen, in metal air battery, fuel cell, supercapacitor electrode material and electrochemical energy storage and conversion devices (claimed). ADVANTAGE - The method enables to prepare three-dimensional nitrogen-doped graphene which has high nitrogen content. DETAILED DESCRIPTION - Preparing three-dimensional nitrogen-doped graphene involves taking poly 2,5-benzimidazole (ABPBI) as carbon and nitrogen source and ferric hydroxide and iron oxide (Fe2O3) nanoparticles as template, mixing to keep the aromatic ring in the same plane and pyrolyzing under the protection of inert gas. The dilute acid solution is added to remove the template to obtain three dimensional nitrogen-doped graphene, where the ABPBI is soluble, rich in nitrogen-containing imidazole ring and terminal ammonia, and its benzimidazole ring is rigid aromatic ring, and is easy to form nitrogen-doped graphene structure during pyrolysis. The ABPBI solution is mixed with nanoparticles of ferric hydroxide and iron oxide template according to certain mass ratio under the protection of argon gas and pyrolized in high temperature furnace for 2-3 hours. The dilute acid solution is added to remove the template to obtain three dimensional nitrogen-doped graphene.