Design,and Synthesis Of Non Noble Metal Catalytic Materials For Electrochemical CO₂ Reduction

In the global energy supply,fossil fuels such as oil are still the main body.In recent years,the rapid increase of CO2 concentration in the atmosphere is the consequence of the rapid development of society,mainly due to the large use of fossil fuels.Excessive CO2 emissions cause global warming,environmental pollution and other environmental problems.At present,the utilization of carbon dioxide resources includes thermochemical reduction,photochemical reduction,photocatalysis reduction,electrochemical reduction and other methods.The electric energy obtained from renewable energy,such as solar energy and wind energy,is electrocatalytic converted from CO2.It is of great significance to convert this cheap C1 raw material into fuel or high value-added chemicals.The electrochemical reduction technology of turning waste into treasure is widely concerned due to its advantages of mild reaction conditions,clean energy use,high catalytic efficiency and controllable electrolysis conditions.The problem lies in the low selectivity,high passing point,low catalytic activity,difficult preparation and high price of the product,which are the bottlenecks of this technology.Therefore,our improvement strategy is to use non noble metals(such as nickel,iron,manganese,bismuth)to design and prepare catalytic materialsThis project is devoted to research and seek the design,synthesis and performance of non noble metal catalytic materials.The research content is divided into the following two parts:(1)carbon based nickel monoatom was prepared by ultrasonic assisted method and calcination method,and the influence of different loading and calcination temperature was discussed.By means of Spherical difference electron microscope,scanning electron microscope,XRD,XPS,ICP,BET,electrochemical workstation,gas chromatography,the structure and catalytic performance of the bimetallic catalyst were characterized.Compared with no doping of nitrogen or no loading of nickel,the selectivity of carbon monoxide of carbon based nickel atom was greatly improved.(2)Bi-MOF materials were synthesized by hydrothermal method,and the effects of different synthesis temperature,ligands and electrolysis conditions were discussed.By means of Spherical difference electron microscopy,scanning electron microscopy,XRD,XPS,CO2 physical adsorption,bet,in situ EXAFS,DFT theoretical calculation,electrochemical workstation,gas chromatography,NMR,the structure characterization and catalytic performance of the bimetallic catalyst were tested.The possible reaction mechanism and influencing factors were studied.The internal mechanism of Bi-MOF for maintaining good stability of carbon dioxide electroreduction was preliminarily obtained.This provides a useful reference for the study of synthesis and properties of non noble metal catalytic materials to regulate the activity and selectivity of CO2 electroreduction.