▎ 摘　　要

NOVELTY - Preparing cobalt single atom oxygen reduction catalyst loaded by porous graphene nitride comprises mixing urea and cyclohexanone octahydrate, heating to obtain a cross-linked polymer product, fully mixing the cross-linked polymerization product with cobalt nitrate hexahydrate and anhydrous magnesium chloride, subjecting to high-temperature pyrolysis treatment under an inert atmosphere, obtaining CoSA-C2N catalyst after centrifugal washing and drying, where the catalyst has excellent performance under alkaline conditions electrocatalytic oxygen reduction activity, substance ratio of urea and cyclohexaone octahydrate was 1:0.215, the mass ratio of the cross-linked polymer product to anhydrous magnesium chloride is 1:3.75 and the ratio of urea to cobalt nitrate hexahydrate is 1:0.135. USE - The method is useful for oxygen reduction reaction (claimed). ADVANTAGE - The porous graphene nitride loaded cobalt single atomic oxygen reduction catalyst has high stability, high semi-slope potential and persistent stability. The catalyst shows high half slope potential (E1/2 = 0.87V) and initial potential and excellent durability in the electro-catalytic oxygen reduction reaction. It has a certain commercial large scale development potential. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for oxygen reduction reaction.