▎ 摘　　要

Trend of technology toward new energy storage systems has dramatically increased and among them lithium-air battery has a unique characteristic regarding energy density as well as low cost. In this study, CoLaFe2O4-G nano-composite with spinel structure is introduced as a promising and cost-effective electrocatalyst, which can be used as a cathode in metal-air batteries as well as lithium-air batteries. To improve the electrical conductivity as well as to enhance its activity, the nano-composite was coupled with graphene (CoLaFe2O4-G). The physical and chemical properties of the prepared samples after loading on glassy carbon were investigated by using cyclic voltammetry, linear and electrochemical impedance spectroscopy. Also, their morphologies were characterized by X-ray diffraction, Field Emission Scanning Electron Micrographs and Fourier Transform Infrared. The results showed the high performance of the prepared nano-composite in 0.1 M KOH, with current density of 3.0 mA/cm(2). It was found that oxygen reduction reaction is catalyzed by the CoLaFe2O4-G and CoLaFe2O4 nano-composites via two-electron processes. The results also indicated that CoLaFe2O4-G had higher current density as well as positive onset potential than pure CoLaFe2O4 and G had. The onset potential (- 0.13 V vs. Ag/AgCl) and half-wave potential (- 0.22 V vs. Ag/AgCl) of the CoLaFe2O4-G for oxygen reduction reaction can be used as an alternative to that of Pt/C (10 wt%).