▎ 摘　　要

NOVELTY - Preparing high-efficient iron-loaded three-dimensional iron-nitrogen-carbon oxygen reduction catalyst comprises e.g. (i) dispersing graphene oxide and carbon nanotubes in deionized water, (ii) adding organic small molecule nitrogenous compound as nitrogen source into mixed dispersion, then adding inorganic iron source, (iii) quenching mixed solution and pre-frozing in liquid nitrogen, (iv) placing three-dimensional sample in tube furnace, calcining, and (v) preparing dilute hydrochloric acid, rinsing sample, suction filtering, rinsing sample with deionized water, placing in oven, and drying. USE - The method is useful for preparing high-efficient iron-loaded three-dimensional iron-nitrogen-carbon oxygen reduction catalyst. ADVANTAGE - The method: utilizes cheap and easily obtained raw materials; and catalyst has higher efficient iron content and better catalytic activity. DETAILED DESCRIPTION - Preparing high-efficient iron-loaded three-dimensional iron-nitrogen-carbon oxygen reduction catalyst comprises (i) dispersing graphene oxide and carbon nanotubes in deionized water to obtain dispersion of graphene oxide and carboxylated carbon nanotubes, mixing two dispersions, performing ultrasound treatment to obtain mixed dispersion of graphene oxide and carboxylated carbon nanotubes, (ii) adding organic small molecule nitrogenous compound as nitrogen source into mixed dispersion, ultrasonic mixing, then adding inorganic iron source and ultrasonically mixing to obtain mixed solution, (iii) quenching mixed solution and pre-frozing in liquid nitrogen, placing in a freeze dryer, vacuum drying to complete sublimation of ice to obtain three-dimensional sample, (iv) placing three-dimensional sample in tube furnace, calcining at 700-800 degrees C for at least 3 hours in atmosphere of ammonia, and then naturally cooling to room temperature, and (v) preparing 1% mass fraction of dilute hydrochloric acid, rinsing sample, suction filtering, rinsing the sample with deionized water, placing in oven at room temperature conditions, and drying. An INDEPENDENT CLAIM is also included for high-efficient iron-loaded three-dimensional iron-nitrogen-carbon oxygen reduction catalyst obtained by above method.