以高含氮量的2-氨基咪唑为氮源，三氯化铁为铁源，高比表面积的KJ600碳黑为载体，通过水热法制得氨基咪唑聚合物前驱体，再经二次高温热处理，制得石墨烯/碳黑复合材料. 透射电镜表征显示该材料为石墨烯纳米片与碳黑颗粒的复合结构. BET表征表明这是一种多孔结构，具有很高的比表面积（882 m²•g^-1），这有利于暴露更多活性位点，并促进传质. XRD证实催化剂中存在石墨烯，且石墨烯结构是在第一次热处理过程中形成的. 电化学测试表明，该催化剂在酸性和碱性介质中都具有很高的氧还原电催化活性和低H₂O₂产率，并且在碱性介质中对甲醇小分子的抗毒化性能明显优于商业Pt/C催化剂，展示出在实际燃料电池系统中的应用潜力.

Oxygen reduction reaction (ORR) is a bottleneck for improving the efficiency of proton-exchange membrane fuel cells as a cathode reaction due to its sluggish kinetics. The exploitation of low cost and high performance non-precious metal catalysts such as Fe/N/C based materials toward ORR has attracted extensive attentions. In this work, the Fe, N-doped graphene nanosheets/carbon black composite was prepared by hydrothermal polymerization and followed by a twice-heat-treatment procedure using 2-aminoimidazole as an N precursor, FeCl₃ as an Fe precursor and KJ600 carbon black as a support. The TEM images revealed that the graphene nanosheets were separated by carbon black nanoparticles to form a robust composite architecture. This composite structure can provide high surface area and porous structure, facilitating the exposure of active sites and the mass transfer of O₂. The XRD patterns proved the existence of graphene nanosheets formed during the first heat treatment. The obtained AIZ-Fe/N/C catalyst exhibited high ORR activity and low H₂O₂ yield in an alkaline medium. Its methanol resistance was much better than that of commercial Pt/C catalyst. Furthermore, the ORR activity in an acid medium was also impressive. These results demonstrated that the AIZ-Fe/N/C catalyst is a promising candidate to replace Pt-based catalysts as a cathode catalyst in fuel cells.