Metal platinum (Pt) is a very good catalyst for fuel cells, but platinum reserves are limited and expensive. How to increase their atomic utilization and reactivity, determines the large-scale application of fuel cells.
A few days ago, "Science" published the results of a collaboration between Professor Huang Xiaoqing of Suzhou University, Professor Guo Shaojun of Peking University, and Su Dong of the Brooke Haven National Laboratory in the United States. They covered 4 of platinum-lead (PtPb) nanosheets. - 6 layers of platinum, this new material has a very high redox reactivity and durability. This achievement has played an important role in the exploration and development of better high-performance catalysts to promote the rapid development of fuel cells.
The energy efficiency of fuel cells is very high and the environment is friendly, but the high cost of the fuel cell results in limited large-scale applications. Platinum used in automotive fuel cells accounts for 40% of the cost of fuel cells. In addition, the platinum material is easily deactivated by harmful components such as sulfides or carbon monoxide, which also greatly affects the working life of the fuel cell.
Huang Xiaoqing's research group has worked closely with several research groups at home and abroad to successfully prepare high-quality, monodisperse PtPb nanosheets using chemical methods. They found that 4-6 Pt layers can very well cover the surface of PtPb nanosheets, forming a unique PtPb/Pt core-shell structure. It was found that the strong tensile stress on the Pt(110) surface can greatly promote the redox reaction performance, which makes the PtPb/Pt core-shell structure catalyst have excellent redox reaction performance. The uniform four-layer Pt shell on the surface of the PtPb/Pt nuclear nanodisks ensures the high durability of these catalysts, which undergoes almost no activity decay after 50000 voltage cycles and no significant structural and compositional changes. It is commendable that the catalyst can be used not only as a catalyst for the cathodic redox reaction of fuel cells, but also as a catalytic anode reaction. (Reporter Zhang Wei correspondent Ding Hao)
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