▎ 摘　　要

NOVELTY - Preparing diatomic catalyst (I), comprises loading the dinuclear complex (II) as a precursor on the carrier and carrying out high-temperature pyrolysis under an inert atmosphere to obtain the final product. USE - (I) is useful for electrochemical reactions including electro catalytic oxygen reduction, electrocatalytic carbon dioxide reduction and electrocatalytic oxygenation (all claimed). ADVANTAGE - (I) has electrochemical activity. DETAILED DESCRIPTION - Preparing diatomic catalyst of formula (M1M2-carrier) (I), comprises loading the dinuclear complex of formula (M1M2L.Xn) (II) on as a precursor on the carrier and carrying out high-temperature pyrolysis under an inert atmosphere to obtain the final product, where M1and M2are loaded on the carrier in their respective atomic states, the distance between M1and M2is 2-4 Å, and the carrier is a carbon-based material or a metal oxide. The ligand compound contains at least five coordination atoms, and the coordination atoms are nitrogen, oxygen, sulfur and/or phosphorus, preferably the basic structural unit containing a coordinating atom in the ligand is carbene, pyridine, pyrrole, amino, Schiff base, hydroxy, carboxy or carbonyl group units. The carbon-based material is Norit, Ketjen black, Vulcan, Black Pearl, acetylene black, carbon nanotubes, graphene, Graphitic carbon nitride or nitrogen-doped carbon. The metal oxides are e.g. cerium oxide, zinc oxide, aluminum oxide, zirconium oxide, magnesium oxide, molybdenum oxide or tungsten oxide. M1, M2= metal atoms including Mg, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sn, Ru, Rh, Pd, Ir, Pt, Ag or Au; L = nitrogen-containing organic ligand of formula (III); X = counterion used to balance the overall charge; n = number of counter ions required to make the overall complex neutral (if n is greater than 1, there are same or different multiple counter ions); X = N, O, S or P; R1= 1-6C alkyl, 2-6C alkenyl, halogen, 6-20C aryl, -OC1-6 alkyl, -OC2-6 alkenyl; Y = alkenylene (-CH=CH-), propylene (-CH2CH2CH2-) or 1,2-phenylene (where Y group can continue to be substituted by R1). An INDEPENDENT CLAIM is also included for diatomic catalyst (I) prepared by the above method.