Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst

The invention discloses a Co@NC high-dispersion core-shell structure catalyst, and a preparation method and an application of the catalyst, and belongs to the technical field of energy source materials and electrochemistry. The preparation method of the catalyst comprises the steps of taking glucose as a C source, taking cyanoguanidine as a C-N source, taking Co(No3).6H2O as a Co source, and performing high temperature calcination. The cyanoguanidine performs high temperature decomposition to generate two-dimensional flaky g-C3N4; the glucose performs high temperature decomposition to generatea carbon intermediate and a metal species which are inserted into flakes of g-C3N4; and Co nanoparticles coated by an N-C layer in the catalyst are uniformly dispersed on a graphene carbon layer. Thecatalyst can serve as a cathode oxygen reduction electrocatalyst of a metal-air battery and a fuel battery. The catalyst is cheap and easy obtaining in raw material, and simple in preparation technology; amplification production is facilitated; in-situ decomposition of the cyanoguanidine provides rich N doped active sites for the catalyst; rich mesoporous structures are formed; the activity of the catalyst is improved; a channel is provided for transfer and transport of reaction participation substances in an ORR process; a mass transfer demand of a reaction process is met; and the catalyst is good in stability and high in methanol resistance.