▎ 摘　　要

NOVELTY - Carbon dioxide electrochemical reduction catalyst rich in oxygen vacancies comprises catalyst which is metal nanoparticles loaded on nitrogen-doped graphene by adsorption and hydrothermal self-assembly of one or more metal salt precursors and graphene oxide, and the surface of the metal nanoparticles is rich in metal oxide phases with oxygen vacancies, where the catalyst comprises 2-10 pts. wt. metal, 80-92 pts. wt. carbon, 2-6 pts. wt. nitrogen, and 3-8 pts. wt. oxygen. USE - The oxygen-rich vacancy-rich carbon dioxide electrochemical reduction catalyst is used in an electrochemical reduction reaction (claimed). ADVANTAGE - The carbon dioxide electrochemical reduction catalyst has excellent carbon dioxide electrochemical reduction performance, is stably dispersed on the carbon substrate, and exhibits excellent carbon dioxide reduction reaction performance. The preparation method is carried out in a simple and cost-effective manner in a short period. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the oxygen-rich vacancy carbon dioxide electrochemical reduction catalyst, comprising (a) ultrasonically dispersing graphene oxide in deionized water, and performing ultrasonic treatment for 28 hours to prepare a uniform suspension with a concentration of 1-5 mg/ml, denoted as dispersion A, (b) adding one or more metal salt solutions of nickel chloride hexahydrate, ferric nitrate hexahydrate and zinc nitrate hexahydrate into the dispersion liquid A, performing ultrasonic dispersion for 14 hours, placing in a hydrothermal kettle for heating reaction, where the reaction temperature is carried out at 140-220 degrees C for 10-16 hours, and drying the obtained reaction product in a freeze dryer for 5-20 hours to obtain a dried composite, (c) setting the furnace temperature to 700-1100 degrees C, where the gas flow rate of argon is 100 plus minus 50 sccm, ammonia is 50 plus minus 20 sccm, putting the dried composite prepared in the step (b) into a tubular furnace center, and carrying out high-temperature heat treatment for 0.5-3 hours to obtain the metal nanoparticles loaded on the nitrogen-doped graphene, and (d) keeping the furnace temperature unchanged, changing the gas flow rate to 100 plus minus 50 sccm argon, 10 plus minus 5 sccm hydrogen gas, and performing high-temperature heat treatment for 10-60 minutes to obtain the oxygen vacancy-rich carbon dioxide electrochemical reduction catalyst.