Simple method for preparing Co-Nx/C efficient selective photocatalyst

Depletion of energy resources and environmental pollution are two problems needing to be resolved immediately at present, and rich solar energy provides an efficient path for solving the two problems. Effective conversion of luminous energy and chemical energy cannot be performed without a photosensitive nano-material with excellent photocatalytic activity. A metal-organic complex serves as a precursor, and the Co-Nx/C efficient selective photocatalyst is prepared through a simple one-step heat polymerization method. The invention belongs to the field of carbon material science. The organic ligand is selected from dimethylglyoxime with low price and high coordination ability, a low-price transition metal salt (cobalt chloride) is selected in the metal center, and after high-temperature calcinations, the catalytic active site (Co-Nx) is successfully introduced into the catalyst. The Co-Nx/C catalyst is capable of selectively sensitizing oxygen so as to produce high-activity singlet oxygen. The Co-Nx/C active center is formed, the energy difference (Delta EST) between a singlet state and a triplet state is reduced, the intersystem crossing (ISC) process is promoted, production of the singlet oxygen is enhanced, and the selective photocatalytic oxidation ability is improved.