The graphene shell nanoparticle catalyst was analyzed in detail by SEM (Fig. ). As expected, the nitrogen-doped carbon material showed obvious sponge-like porous characteristics, with highly ordered and regular carbon sheet structure and identifiable pores. According to the TEM image (Fig. ), the metal nanoparticles were well dispersed on the surface of the carbonaceous matrix, and the EDS spectrum (Fig. ) also visually verified that the C, N, O, and Co elements were highly dispersed in the catalyst. The chitosan carrier contains rich N/O functional groups, porous structure, and large specific surface area, which can anchor the Co nanoparticles more tightly and provide abundant adhesion sites for the Co nanoparticles so that the Co nanoparticles have good dispersion and promote the high activity of the catalyst. It is not difficult to find wellresolved stripes with a spacing of 0.204 nm on the metal nanoparticles through the polycrystalline selected area electron diffraction rings, which corresponds to the formation of the Co (111) plane during the pyrolysis process, and the crystal plane corresponds to the grating number.