The reporter learned from the University of Science and Technology of China that the research team of Professor Zeng Jie of the Hefei National Research Center for Microscale Physical Sciences and Professor Huang Hongwen of Hunan University have developed a proton exchange membrane fuel cell with excellent catalytic activity and stability Cathode catalyst. The results were published in the Journal of the American Chemical Society recently.
Proton exchange membrane fuel cell has the advantages of zero emission, high energy efficiency, adjustable power, etc. It is the most ideal driving power source for electric vehicles in the future. However, the kinetics of the oxygen reduction reaction at the cathode end of the proton exchange membrane fuel cell is very slow. A large number of precious metal platinum nanocatalysts are required as electrode catalysts to maintain the efficient operation of the battery, which makes the cost of the proton exchange membrane fuel cell very high, which limits Large-scale commercial application.
In platinum-based catalysts, improving the mass activity and catalytic stability of platinum-based catalysts in oxygen reduction reactions is the way to reduce the amount of precious metal platinum. But most of the catalysts are not stable enough.
Faced with this problem, the researchers developed ultra-fine platinum-nickel-rhodium ternary metal nanowire catalysts by fine-tuning the dimensions, size, and composition of platinum-based catalysts. Since the diameter of the nanowire is only one nanometer, the ratio of platinum atoms on the surface to the overall platinum atoms is higher than 50%, which shows an extremely high atomic utilization rate and provides a structural basis for high catalytic mass activity.
Oxygen reduction catalytic tests show that the mass activity of carbon-supported ultrafine platinum nickel rhodium ternary metal nanowire catalysts is 15.2 times that of the current commercial platinum carbon nanocatalysts. At the same time, after this catalyst was used 10,000 times in an oxygen atmosphere, only 12.8% of the mass activity performance was lost. However, after the current commercial carbon-supported platinum nanocatalyst was used 10,000 times in an oxygen atmosphere, the mass activity performance reached 73.7%. The new catalyst has a significant improvement in quality activity and catalytic stability, showing good application potential. (Reporter Wu Changfeng)
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