▎ 摘　　要

NOVELTY - A rigid benzimidazole ring of a macromolecular compound can be regularly arranged on the surface of nano calcium carbonate template in form of a template, and pyrolysis process is performed for 2-3 hours in presence of dilute hydrochloric acid under protection of inert gas, to obtain nitrogen-doped graphene material. The macromolecular compound is chosen from m-polybenzimidazole and o-polybenzimidazole. m-Polybenzimidazole or o-polybenzimidazole can easily form nitrogen-doped graphene structure during the pyrolysis. USE - Preparation of three-dimensional nitrogen-doped graphene used as catalyst in oxygen reduction reaction in metal air battery and fuel cell, catalyst for electrolysis of water to oxygen, and electrode material for supercapacitor (all claimed). DETAILED DESCRIPTION - A rigid benzimidazole ring of a macromolecular compound can be regularly arranged on the surface of nano calcium carbonate template in form of a template, and pyrolysis process is performed for 2-3 hours in presence of dilute hydrochloric acid under protection of inert gas, to obtain nitrogen-doped graphene material. Carbon dioxide produced by the pyrolysis of calcium carbonate forms small through-holes between the template, and template is removed, to obtain three-dimensional nitrogen-doped graphene material with multistage through-holes. The macromolecular compound is chosen from m-polybenzimidazole and o-polybenzimidazole. m-Polybenzimidazole or o-polybenzimidazole is soluble, and has and terminal amino group and nitrogen-containing benzimidazole ring, and can easily form nitrogen-doped graphene structure during the pyrolysis.