▎ 摘　　要

NOVELTY - A metal-free oxygen reduction catalyst preparing method involves washing glassy carbon substrate. The PDDA glassy carbon substrate having a surface layer is immersed in graphene oxide solution, after washing with water, dried to give the surface an oxide layer followed by repeating steps to give glassy carbon substrate, utilizing carbon substrate having multilayer phase resulting graphene oxide and PDDA as working electrode, molybdenum wire as the counter electrode, electrochemical reduction reaction in nitrogen-saturated phosphate buffer solution to give i.e. non-metal oxidation catalyst. USE - Method for preparing metal-free oxygen reduction catalyst. ADVANTAGE - The method enables preparing catalyst without need of high temperature device, in simple, convenient, and low energy consumption manner. DETAILED DESCRIPTION - A metal-free oxygen reduction catalyst preparing method involves washing glassy carbon substrate successively with 1.0-0.3 mu m alumina powder on the polishing cloth to polish mirror, as a working electrode, utilizing a molybdenum wire as the counter electrode, silver (Ag)/Ag+ as a reference electrode, performing electrochemical oxidation reaction in the electrolyte, the potential of the electrochemical oxidation reaction of 0-1.2V, to obtain negatively charged surface glassy carbon substrate, where the electrolyte solution is 4-aminobenzoic acid, lithium perchlorate and a mixture of absolute ethanol. The resulting glassy carbon substrate is immersed in 0.2-1 wt.% phthalate diethylene glycol diacrylate (PDDA), aqueous solution, for 5-60 minutes, removed and rinsed with water, dried with nitrogen to give a glassy carbon substrate having a surface with PDDA layer that is positively charged. The PDDA glassy carbon substrate having a surface layer is immersed in a 0.1-0.5mg ml-1 graphene oxide solution, for 5-60 minutes later, after washing with water, dried with nitrogen to give the surface an oxide layer having a graphene glassy carbon substrate, followed by repeating steps to give a glassy carbon substrate having a multi-layered graphene oxide and white PDDA, utilizing glassy carbon substrate having a multilayer phase resulting graphene oxide and PDDA as a working electrode, molybdenum wire as the counter electrode, Ag / AgCl as a reference electrode, the electrochemical reduction reaction in a nitrogen-saturated phosphate buffer solution to give glassy carbon substrate having a multi-phase electro-reduction of graphene oxide and PDDA, multi-phase power reduction of graphene oxide and PDDA, i.e. non-metal oxidation catalyst.