Fabrication And Electrocatalytic Performance Of Tantalum/carbon Composites Based On Interface And Defect Regulation

As a new type of green energy,PEMFCs plays an important role in solving the energy crisis in the 21st century.However,the poor activity and stability of electrode materials have seriously hindered the industrialization of fuel cells.It is found that the carbon and tantalum based electrode materials have the advantages of simple preparation process,high intrinsic catalytic activity and good structure stability,and are a promising electrode materials for fuel cells.In this paper,we combine the two materials to form Ta-based graphene composites through artificial control of the interface and defects of the composite catalyst.We explore its catalytic performance.And the main research contents are as follows:1.The use of urea and the interaction of metal Ta source cambium-like precursor,and is obtained by calcining the layered precursor TaON|N-r GO composite carrier,Pt by Na BH₄ particle clusters at room temperature load on the two dimensional composite carrier,finally get the Pt|TaON|N-r GO composite catalyst,we adjust the tantalum/carbon ratio,It is found that when the ratio of Ta to C reaches a certain level,the composite catalyst can form the most ternary interface and have the highest defect concentration.It was found that when the C/Ta（R ratio）reached 7.5,the catalyst had the highest ORR activity,and when R=5,the alcohol oxidation performance was the best.2.In the last chapter Pt|TaON|N-r GO,on the basis of composite catalyst,we in the synthesis of precursor,the introduction of element B body by doping,hope that through the introduction of impurity atoms to generate more defects,improve the catalytic activity,at the same time improve the anchoring effect of Pt,further enhance stability.We through electrochemical test to explore the ORR activity and stability of Pt|TaON|CB in alkaline medium,and the catalyst in acidic environmental of different alcohol molecules electrical oxidation performance,and the results are compared with the commercial Pt/C.The results show that the introduction of boron improves the activity and stability of the catalyst.3.In order to explore the TaON N and O the impact on the system as a whole activity,we through artificial regulation and O N elements dispersion in the precursor was synthesized with defects of Ta N@Ta O|N-r GO composite catalyst.Then the loaded Pt cluster is restored at the defect of Ta N@Ta O.Explores the Pt/Ta N@Ta O|N-r GO oxygen reduction performance in alkaline medium.Finding defects complex catalyst Pt/Ta N@Ta O|N-r GO had the optimally catalytic competence and durability.