▎ 摘　　要

A thin slice-like Co3O4/N-doped graphene (Co3O4-N-Gr) was prepared through a hydrothermal reaction. The asprepared Co3O4-N-Gr displayed an onset potential and half-wave potential of 0.98 and 0.86 V, which were 40 and 80 mV larger than that of Pt/C (0.94 and 0.78 V), while its Tafel slope (31.4 mV dec(-1)) was much lower than Pt/C (44.7 mV dec(-1)). Moreover, the current density retained 96.25% after working for 6000 s and had no change after adding methanol. These suggest that the Co3O4-N-Gr is promising as an efficient electrocatalyst for oxygen reduction reaction (ORR) in alkaline medium when compared with Pt/C and other reported non-precious catalysts.