Synthesis Of Novel Metal Organic Framework Composite Nanomaterials And Their Applications In Photocatalysis And Electrocatalysis

In this paper,the application of metal organic frameworks in various fields was studied.The study of photocatalytic oxidation of nitric oxide,and the oxygen reduction reaction in the cathode of the fuel cell were about the atmospheric environment,as well as the world's energy problems.Two novel metal organic frameworks were synthesized by microwave assisted synthesis in the paper.The photocatalytic activity of the photocatalyst was investigated under visible light irradiation.The electrocatalytic activity and stability of the electrocatalytic oxygen reduction reaction in alkaline system at room temperature were studied.We hope that through these studies,we can provide efficient catalysts and advanced technologies for the environment,energy,chemical industry,motor vehicles and so on.?1?Microwave synthesis of metal organic frameworks?Ti?doped with gold in visible light photocatalytic oxidation of NOA novel metal organic framework NH₂-MIL-125?Ti?has been successfully synthesized by microwave assisted photocatalytic oxidation technique.The uniform load of gold nanoparticles by impregnation reduction,Au@NH₂-MIL-125?Ti?,the load of gold nanoparticles can significantly increase the metal organic framework NH₂-MIL-125?Ti?catalyst has excellent photocatalytic activity and stability.Gold nanoparticles can improve the capture ability of light,but also promote the rapid conduction of photogenerated electrons,so as to reduce the recombination of electrons and holes,and improve the photocatalytic activity.?2?Synthesis of a novel CNT/ZIF based porous carbon composite?Co-N-CNT?and its application in oxygen reduction reactionIn order to increase the conductivity,carbon nanotubes were used as the metal active sites to promote the electron transfer.Finally,ZIF-67 was chosen as the sacrificial template.CNT/ZIF-67 prepared by microwave synthesis method,high temperature heat treatment in argon,Co-N-CNT-700 catalyst prepared by the electrocatalytic activity of oxygen reduction reaction?ORR?showed better.Contrastwith Co-N-CNT-700 catalyst and commercial 20%Pt/C catalyst about electro catalytic activity of ORR,methanol resistance and stability,the activity of Co-N-CNT-700 was better than the commercial 20%Pt/C catalyst.Through the development of new catalysts and optimizing the catalysts,it mainly solved the existing photocatalytic oxidation of nitric oxide by using low light efficiency,low rate of higher recombination of photogenerated electrons and holes.Combined with the characterization and kinetics tests,it revealed the mechanism of photocatalytic oxidation of nitric oxide and structure-activity relationship.At present,the electrocatalytic catalyst of oxygen reduction reaction in high cost,complicated preparation process,catalyst poisoning and other factors caused the problem of low electrocatalyst utilization.Combined with the characterization and electrochemical test,it explained the mechanism of electrocatalytic oxygen reduction reaction.