▎ 摘　　要

NOVELTY - Microbial electrochemical system, whose anode material is a three-dimensional nitrogen-doped graphene aerogel. The three-dimensional nitrogen-doped graphene aerogel is prepared by (a) mixing the graphene oxide suspension with ethylenediamine, and heating to react to obtain a three-dimensional nitrogen-doped graphene hydrogel; and (b) freeze-drying the three-dimensional nitrogen-doped graphene hydrogel. USE - The system is useful in microorganism electrochemical field. ADVANTAGE - The method is suitable for large-scale popularization and use and has low raw material cost and simple preparation method and ensures the electric performance improving effect of battery energy storage system is obvious.