▎ 摘　　要

Cobalt-incorporated nitrogen-doped reduced graphene oxide (Co/NrGO) as a catalyst for the oxygen reduction reaction is prepared in a single step by thermal reduction of graphene oxide to reduced graphene oxide (rGO) in the presence of a cobalt salt and 1,10-phenanthroline as a nitrogen precursor. Cobalt is identified as cobalt oxide (CoO) in the hybrid. Both the cobalt and nitrogen contents in Co/NrGO are higher than those in cobalt-or nitrogen-free samples; this indicates that cobalt and 1,10-phenathroline mutually enhance incorporation into the material. An almost four-electron transfer is observed as the average per oxygen molecule, and Co/NrGO demonstrates highly improved activity in comparison with NrGO and rGO. CoO and nitrogen-doped moieties may be acting as active centers for oxygen reduction individually or synergistically. With a loading of less than 2 wt% cobalt in Co/NrGO, appreciable activity is already observed. Moreover, the high selectivity for oxygen reduction over methanol oxidation for Co/ NrGO is demonstrated, making this hybrid a promising catalyst for direct methanol alkaline fuel cells.