A high -performance Co3O4-CeO2/Co-N-C composite catalyst and preparation method and application thereof

The invention relates to a high-performance Co3O4-CeO2/Co-N-C composite catalyst and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolvingcobalt salt and cerium salt, adjusting pH to 7-11, adding a nitrogen-doped carbon carrier, and hydrothermally reacting for 10-20h at 60-100 DEG C; the nitrogen-doped carbon carrier is obtained by reacting a carbon source and a nitrogen source with a mass ratio of 1: 1 to 5; S2: the solution after the reaction of S1 is sucked, filtered, washed, dried and ground to obtain the Co3O4-CeO2/Co-N-C composite catalyst. The preparation method provided by the invention utilizes a hydrothermal method, wherein the nitrogen-doped carbon carrier, the cobalt source and the cerium source are hydroheated in one pot, the process is simple, the operation is easy, the time is short, and the method is suitable for batch industrial production; and the prepared composite catalyst has excellent catalytic properties for both ORR and OER,