Method for preparing oxygen reduction catalyst transition metallic oxide/nitrogen-doped carbon composite material

The invention discloses a method for preparing an oxygen reduction catalyst transition metallic oxide/nitrogen-doped carbon composite material. The method includes the following steps that firstly, dopamine hydrochloride, ammonia water, methyl alcohol and deionized water are mixed, and brown powdery PDAs is obtained; secondly, the PDAs obtained in the first step is calcinated under inert gas flow; thirdly, carbon spheres CPDAs obtained in the second step are mixed with cobalt chloride, ferric trichloride and water in a stirred mode, and a mixed solution is obtained; fourthly, mixed alkaline liquor is prepared; fifthly, the mixed alkaline liquor obtained in the fourth step is added into the mixed solution in the third step for a hydrothermal reaction to obtain carbon spheres; sixthly, the carbon spheres obtained in the fifth step are placed in a tubular furnace and calcinated under inert gas flow at a constant temperature, and are cooled to room temperature. The preparation method is easy to operate, the complex step of N doping is not needed in the preparation process, and the material has excellent ORR catalytic performance.