Preparation And Performance Of Low Platinum Loaded Cathode Catalyst For Fuel Cells

In recent years,with the non-renewability of fossil fuels and pollution caused to the environment,new energy has been a hot spot in recent research.The fuel cell has good application prospects because it is not limited by the Carnot cycle and is friendly to environment.However,many factors would affect the performance of fuel cell.In order to improve the performance and stability of the fuel cell,catalyst in the cathode oxygen reduction is important.In recent years,it is also a hot spot for fuel cell research.The research work of cathode oxygen reduction catalysts is mainly to synthesize platinum and other metal alloys,so as to effectively reduce the amount of metal platinum,and to some extent,increase the catalytic activity of the catalyst.The main contents of this research arc as follows:(1)In this research,PtCu/C alloy catalysts were successfully prepared by glycol reduction method.The preparation method is simpler than the literature reported,the preparation conditions are mild,and the synthesis efficiency is high.The prepared catalysts were characterized by XRD,ICP-AES,TEM,EDS,XPS and other characterization methods.It was found that the prepared PtCu/C catalyst has an alloy structure.At the same time,the electrochemical properties of the catalyst were characterized by cyclic voltammetry.The activity of PtCu/C catalyst at 0.9 V was measured under acidic conditions of 0.1 mol/L HClO4 at room temperature.The active area(ESCA)was 85.12 m2/gPt better than commercial Pt/C(74.52 m2/gPt).Through CO adsorption and desorption experiments,the PtCu/C catalyst was found to have better anti-CO toxicity than the commercial Pt/C catalyst.At the same time,the mass specific activity(MA)of PtCu/C was measured to be 57.78 mA/mgPt,slightly larger than the commercial Pt/C(52.83 mA/mgPt),indicating that the PtCu/C catalyst has a good application prospect.(2)As the PtCu alloy catalyst is easy to grow and has good performance,at the same time,it can effectively reduce the amount of Pt.Therefore,the PtCu alloy catalyst is selected as the basis to prepare a ternary alloy catalyst with better performance.This paper explores the basis of the PtCu alloy catalyst through experimental exploration.On the other hand,transition metal precursors were added,and finally PtCuNi/C with better performance was successfully prepared.The ternary alloy catalysts were characterized by XRD,ICP-AES,TEM,EDS and XPS.The results showed that PtCuNi/C catalysts were successfully prepared and the electrochemical performance of the catalyst was characterized by cyclic voltammetry.The active area of PtCuNi/C was 113.46 m2/gpt,about 1.5 times that of commercial Pt/C(74.52 m2/gpt).The mass specific activity of PtCuNi/C is 367.25 mA/mgPt,which is about 7 times that of commercial Pt/C.This is due to the structural and electronic effects of Cu and Ni atoms,which shortens the Pt-Pt interatomic distance,favors the adsorption and dissociation of O2 on the catalyst surface,and improves the catalyst.Oxygen reduction performance.(3)By studying the synthesis method and influencing factors of PtCo/C catalysts,the synthesis of PtCo/C nano-particles with different charge ratios was compared.The catalysts were screened by rotating disk electrodes、TEM、ICP-AES and other experimental methods.After comparing the Pt content of the JM-Pt/C catalyst,the MEA was prepared and assembled into a H2/O2 fuel cell to test performance.