Preparation Of Pt-based And Pd-based Catalyst And Its Electrical Catalytic Performance For Glucose Oxidation

Glucose is the most abundant monosaccharide in nature and is completely oxidized to release very high energy(~ 2870 k J / mol).The availability of useful chemical energy from glucose into electrical energy is a good choice,so it is widely used in industrial production.Precious metals such as platinum and palladium are the most commonly used anode catalyst materials for direct fuel cells.However,Pt,Pd-based catalysts is prone to poisoning,low utilization rate and high cost.In this paper,Pt,Pd-based catalysts were prepared by adding a second metal forming binary alloy catalyst as well as modifying the carrier to improve the catalytic performance of the catalyst,to enhance its CO antipoisoning ability,and reduce its cost.We systematically studied the application of the prepared catalyst in a glucose direct fuel cell(DGCE).The structure and activity stability of the prepared catalysts were characterized by XRD,TEM,XPS and various electrochemical tests.The specific research contents are summarized as follows:1.A series of Pt Sn/C catalysts were prepared with adding a second metal Sn to the Pt catalyst by ethylene glycol impregnation and reduction.The effects of preparation conditions,including Pt loading,solution p H and Pt/Sn atomic ratio,on the electrocatalytic performance of glucose were discussed.The results show that the catalytic performance of the catalyst is best when the Pt loading is 5%,the p H of the solution is 9 and the Pt/Sn atomic ratio is 3.2.Pt-M / C catalyst was prepared by impregnation and reduction with ethylene glycol,and the influence of different metals on the catalytic performance of the catalyst was compared.The results showed that Pt3Sn1/C>Pt3Ni1/C>Pt3Co1/C>Pt/C.On the basis of this,the Pt3Sn1/C-CHI was prepared by modifying the catalyst carrier by chitosan(CHI).The results showed that the catalytic performance of the catalyst was better when the chitosan loading was 1%.To the Pt/C-CHI catalyst,a second metal Ni,Co,the results show that Pt3Sn1/C-CHI>Pt3Co1/C-CHI>Pt3Ni1/C-CHI>Pt3Sn1/C>Pt/C-CHI>Pt/C.3.The Pd-Co/C binary metal catalyst supported on carbon black was prepared by sodium borohydride reduction method.By changing the Pd loading,solution p H and Pd/Co atomic ratio,a certain law was found.The results show that the catalyst exhibits better catalytic performance for the electrocatalytic oxidation of glucose when the Pd loading is5%,the p H of the solution is 9,and the Pd/Co atomic ratio is 3.XRD,TEM,XPS and ESCA showed that the addition of XRD,TEM,XPS and ESCA of the second metal Co showed that the addition of the second metal Co reduced the Pd2+ concentration,increased the content of Pd0 and increased the dispersion of Pd degree and electrochemical active surface area,thus improving the utilization of Pd and its catalytic performance.