▎ 摘　　要

NOVELTY - Nickel-iron diatomic electrocatalyst, anchored with nitrogen/oxygen atoms prepared by adsorption and hydrothermal self-assembly of metal nickel precursors and metal iron precursors with graphene oxide, and then prepared by two-step chemical vapor deposition, and the coordination of metal atoms is unsaturated, is claimed. USE - The nickel-iron diatomic electrocatalyst is useful in electrochemical reduction reaction (claimed). ADVANTAGE - The electrocatalyst: uses nitrogen-doped graphene as a carrier to prevent the aggregation of bimetallic species through interaction with nickel-iron atoms, it forms a stable and well-dispersed nickel-iron diatomic catalyst, which has excellent carbon dioxide electrochemical reduction performance, high activity, strong selectivity, and stable performance, and shows more excellent catalytic activity and selectivity than single-atom catalysts; and ensure the coordination environment of the active site can be adjusted. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing nickel-iron diatomic electrocatalyst, comprising (i) ultrasonic dispersing graphene oxide in deionized water and sonicate for 2-8 hours to obtain uniform suspension with a concentration of 15 mg/ml, which is Dispersion A, (ii) adding nickel chloride hexahydrate and ferric nitrate nonahydrate solution to Dispersion A, dispersing ultrasonically for 1-4 hours, and placing in a hydrothermal kettle to heat the reaction to 140-220 degrees C for 10-16 hours, and drying the obtained reaction product is in freeze dryer for 5-20 hours to obtain dried compound, (iii) set the furnace temperature to 700-1100 degrees C, the gas flow rate to argon: 100 plus minus 50 sccm, ammonia: 50 plus minus 20 sccm, adding dry compound into the center of the tube furnace, heating for 0.5-3 hours to obtain nickel-iron diatomic electrocatalyst anchored on nitrogen-doped graphene by nitrogen atoms, and (iv) keeping the furnace temperature unchanged, the gas flow rate is changed to argon: 100 plus minus 50 sccm, hydrogen: 10 plus minus 5 sccm, after a high temperature heat treatment reaction for 10-60 minutes, a nickel-iron diatomic electrocatalyst anchored by nitrogen/oxygen atoms and coordinated unsaturated is prepared.