▎ 摘　　要

NG/Fe-N/C composite catalysts with sandwich nanostructure were synthesized by an impregnation method using polypyrrole as ligand. Nitrogen-doped graphene was doped into the Fe-N/C catalyst during the process of synthesis. By the synergistic reaction between graphene and Fe-N/C, the catalytic activity and stability of catalyst were improved. XRD, SEM, TEM and XPS were used to character the physical structure, morphology and chemical composite of catalysts. The results show that the catalyst has the optimal oxyen reductive reaction(ORR) activity when the mass ratio of grapheme to BP2000 is 1 4 and the heat treatment temperature is 800 degrees C. The accelerated aging test(AAT) test shows that catalyst NG/Fe-N/C-25 is more stable than commercial 20% Pt/C catalyst in acidic medium. The total N content of NG/Fe-N/C-25 catalyst is about 5.17%, and the content of graphite nitrogen and pyridine nitrogen are about 44.35% and 32.66%, respectively. These high content of graphitic nitrogen and pyridine nitrogen may result in the high ORR activity and stability.