▎ 摘　　要

NOVELTY - Oxygen-reducing electro-catalyst of nitrogen-doped carbon nano-sheet loaded ferrous oxide quantum dot comprises nitrogen-doped carbon nanosheets used as carriers. The ferrous oxide quantum dots used as oxygen reduction electrocatalyst particles. USE - Oxygen-reducing electro-catalyst of nitrogen-doped carbon nano-sheet loaded ferrous oxide quantum dot. ADVANTAGE - The oxygen-reducing electro-catalyst of nitrogen-doped carbon nano-sheet loaded ferrous oxide quantum dot has excellent electrochemical oxygen reducing performance, simple and cost-effective operation, and suitable for commercial production of large scale, and replaces platinum catalyst in the field of electro-catalysis oxygen reduction. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: 1. a method for preparing oxygen reduction electrocatalyst for nitrogen-doped carbon nanosheet-supported ferrous oxide quantum dots, which involves: a. using graphene-like carbon nanosheets as carbon source, nitrogen dopant as nitrogen source, according to mass ratio, mixing 1-5 pts. wt. graphene-like carbon nanosheets and 5-10 pts. wt. nitrogen dopant, placing obtained mixed solid in tube furnace for high temperature activation treatment under nitrogen atmosphere, setting reaction temperature of high-temperature activation reaction to be 500-1100degrees Celsius, controlling heating rate to 2-8degrees Celsius/minute for 1-3 hours, immersing product in 3-10 wt.% hydrochloric acid solution for product washing treatment, and collecting obtained solid product by filtration, washing with deionized water, and drying to obtain clean product; b. mixing 1-5 pts. wt. isopropanol and 1-5 pts. wt. deionized water to obtain mixed solution, adding product to mixed solution, and ultrasonically dispersing to obtain product dispersion; c. subjecting product dispersion to ultrasonic treatment for 5-12 hours with cell crusher, centrifuging at speed of 1000-5000 revolutions/minute (rpm) for 5-10 minutes, and continuing supernatant to be ultrasonicated for 2-5 hours, and sonicating supernatant for 2-5 hours, centrifuging at 10000-20000 rpm for 10-30 minutes to obtain required solid, and drying to obtain nitrogen-doped carbon nanosheets; d. dissolving 50-80 mg of solid nitrogen-doped carbon nanosheets in 10-30 mL of deionized water and uniformly mixing to obtain nitrogen-doped carbon nanosheet solution; e. using ferric chloride hexahydrate as iron source, dispersing solid ferric chloride hexahydrate in deionized water to prepare 1-10 mg/mL iron source solution; and f. adding iron source solution slowly dropwise to nitrogen-doped carbon nanosheet solution, making nitrogen-doped carbon during dropwise addition of iron source solution, nanosheet solution is in continuous ultrasonic state, after adding 2-5 mL of iron source solution dropwise, continuing to sonicate nitrogen-doped carbon nanosheet solution for 2-5 hours in ice bath, and freeze-drying sonicated mixed solution for 36-54 hours, and placing freeze-dried solid material in tube furnace, performing high-temperature activation under nitrogen atmosphere, reaction temperature of high-temperature activation reaction is 500-1100degrees Celsius, and temperature rise rate is controlled to 2-8degrees Celsius/minute, washing final product obtained with deionized water and ethanol for 3-5 times respectively, and collecting obtained solid by filtration, and obtaining black powdery oxygen reduction electrocatalyst of nitrogen-doped carbon nanosheet-loaded ferrous oxide quantum dots; and 2. a method for using oxygen reduction electrocatalyst of nitrogen-doped carbon nanosheet-loaded ferrous oxide quantum dots, which involves: a. using oxygen reduction electrocatalyst of nitrogen-doped carbon nanosheet-supported ferrous oxide quantum dots as catalyst used for electrocatalytic oxygen reduction reaction.