▎ 摘　　要

NOVELTY - Improving hydrogen production performance of dark fermentation by using nitrogen-doped graphene comprises adding nitrogen-doped graphene to dark fermentation hydrogen production system in an amount of 10-200 mg/ l. USE - The method is useful for improving hydrogen production performance of dark fermentation by using nitrogen-doped graphene. ADVANTAGE - The method: produces nitrogen-doped graphene, which has nanoscale and 3D porous network structure, can be better dispersed in a dark fermentation hydrogen production system, provides more attachment sites for microorganisms, and increases the mutual connection between microorganisms; applies nitrogen-doped graphene to a dark fermentation hydrogen production system, which can compensate for the defects of low microbial activity, slow hydrogen production rate, and low hydrogen production in the dark fermentation hydrogen production process.