▎ 摘　　要

NOVELTY - Alkyl dimethyl benzyl ammonium bromide-modified montmorillonite within an interlayer is added to micro-reactor along the vertical direction. A solution of soluble poly(2,5-benzimidazole) is filled in interlayer of template. The aromatic rings in poly(2,5-benzimidazole) molecules are regularly arranged in interlayer, and pyrolyzed under inert gas protection. The template is removed by washing with hydrofluoric acid, to obtain two-dimensional nitrogen-doped graphene with high nitrogen content. USE - Preparation of two-dimensional nitrogen-doped graphene used as catalytic oxygen reduction catalyst in metal air battery and fuel cell and water oxygen evolution reaction catalyst for catalyzing-electrolyzing and for electrode material for supercapacitor (all claimed). ADVANTAGE - The method enables preparation of two-dimensional nitrogen-doped graphene with high nitrogen content. DETAILED DESCRIPTION - 4-16C Alkyl dimethyl benzyl ammonium bromide-modified montmorillonite within an interlayer is added to micro-reactor along the vertical direction. The spacing of layers is adjusted by length of alkyl chain of cationic surfactant, poly(2,5-benzimidazole) as carbon source and nitrogen source, and number of layers of nitrogen-doped graphene is determined after pyrolysis. The solution of soluble poly(2,5-benzimidazole) is filled in interlayer of template by vacuum-assisted method. The aromatic rings in poly(2,5-benzimidazole) molecules are regularly arranged in interlayer, and pyrolyzed under inert gas protection. The template is removed by washing with hydrofluoric acid, to obtain two-dimensional nitrogen-doped graphene with high nitrogen content. Poly(2,5-benzimidazole) solution with different layers of layered template are mixed with respect to different mass ratio and pyrolyzed under argon protection in high-temperature furnace for 2-3 hours, to obtain two-dimensional nitrogen-doped graphene using hydrofluoric acid.