This paper aims to seek for bifunctional catalysts which have low price and good catalytic activity for the oxygen reduction reaction(ORR) and oxygen evolution reaction(OER), while CoFe2O4 is a kind of transition metal oxides which have better catalytic activity. So the thesis mainly focuses on the study of CoFe2O4 hollow nanospheres as cathode catalyst in lithium air batteries. CoFe2O4 hollow nanospheres were prepared in this paper by a simple and mild one-step hydrothermal method, and the preparation of MxCo1-xFe2O4(M= Mn、Ni) hollow nanospheres doped with Mn/Ni were in the same way. By changing the hollow or solid structures or by doping with other metal ions, we try to find their correlations with the electrochemical properties of materials for ORR and OER, and to explore reasons for the improved catalytic performance of materials and mechanisms of catalytic reactions. In addition, the catalytic materials of CoFe2O4 hollow nanospheres and the doped CoFe2O4 hollow nanospheres were used as lithium air battery cathode catalysts(as catalytic materials for air electrode) and assembled into batteries to study differences of the catalytic performance of these batteries. |