▎ 摘　　要

Oxygen reduction reaction (ORR) catalysts play an important role in fuel cells, and the ever-increasing energy demand calls for efficient and cost-effective ORR catalysts. However, commercial ORR catalysts are mainly noble metal based materials like Pt/C, which suffer from drawbacks of high cost and poor stability. In this study, we prepared a non-noble metal ORR catalyst with high efficiency through a simple one-step hydrothermal method, in which the reduction of graphene oxide (GO) along with the doping of nitrogen and Co3O4 nanoparticles were realized at the same time, thus resulting in a unique hierarchical structure of nitrogen-doped reduced graphene oxide/carbon nanotube/Co3O4 (N-rGO/CNT/Co3O4) hybrids. Due to the synergistic effects between the active components and the effective nitrogen doping, as well as the space effect of CNTs and Co3O4 nanoparticles on avoiding the restacking of graphene nanosheets, the N-rGO/CNT/Co3O4 hybrids exhibited enhanced ORR catalytic performance with long-term stability and excellent resistance towards methanol crossover effects, indicating their promising potential as ORR electrocatalysts in practical applications.