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The activity is 5 times that of current commercial catalysts, and the performance remains stable after 6,000 cycles of charging and discharging. Proton exchange in cooperation with Prof. Zeng Jie's team at the Hefei Microscale National Laboratory for Physical Sciences at the University of Science and Technology of China and Prof. Peng Zhenmeng from the University of Akron, USA The development of cathode catalysts for membrane fuel cells has made remarkable progress recently. This achievement has provided new ideas for the development of a new generation of highly efficient and stable fuel cells.
Under the dual pressure of limited fossil energy resources and increased environmental pollution, the research and application of new clean energy represented by proton exchange membrane fuel cells has received global attention. However, this technology still has a significant bottleneck, mainly reflected in the low activity and stability of the oxygen reduction catalyst for the cathode of the battery, which limits the output power of the battery and the number of charge and discharge cycles, thereby impeding the proton exchange membrane fuel. The commercialization of the battery.
Zeng Jie's research group designed and developed a core-shell nano-catalyst with ultra-thin platinum-nickel alloy atomic layer, and realized the regulation of the ratio of platinum to nickel atoms. The inside of this core-shell type nanocatalyst is a palladium core with low catalytic activity but very stable, and the outside is a platinum-nickel alloy with high catalytic activity, which not only has a very high platinum atom utilization rate, but also has an oxygen reduction reaction. The highly active surface lattice required.
Studies have shown that the catalyst's activity for cathode oxygen reduction of proton exchange membrane fuel cells is as high as 0.79 kA/g, which is about 5 times that of current commercial platinum carbon catalysts. In addition, due to the presence of a relatively stable palladium core within the new catalyst, the overall stability of the catalyst is greatly improved, and its performance is not significantly reduced after 6,000 cycles of charge and discharge tests. The internationally renowned chemical journal “The American Chemical Society†recently published this important research result. Experts commented that this research result provides an efficient nanocatalyst for the development of a new generation of fuel cells, and also provides improved fuel cell performance. New ideas. (Reporter Li Chen continued correspondent Yang Baoguo)
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