▎ 摘　　要

Development of reactive and stable non-preciously metallic catalysts toward oxygen reduction reaction is a fascinating research field for fuel cells. Herein, a hybrid electrocatalyst consisted of hollow CoO nanoparticles embedded in N-doped mesoporous graphene (CoO@N-G) has been successfully prepared via carbonizing the precursor which is prepared from graphene oxide and N, N '-Bis(salicylidene) ethylenediamine cobalt salt in the presence of hydrazine hydrate. The formation of hollow CoO nanoparticles is generally attributed to the nanoscale Kirkendall effect. The effective synergistic effect of hollow CoO nanoparticles and N-doped mesoporous graphene is helpful to obtain excellent electrocatalytic activity with four-electron selectivity, long-term stability and good anti-methanol.