According to a report by the Physicist Organizations Network on July 3 (Beijing time), American scientists said in a recent edition of the American Chemical Society Network that they have developed a new molybdenum disulfide structure that can act as a water-producing hydrogen The catalyst in the reaction is expected to replace the expensive platinum and help humans to enter the era of “hydrogen economy†of economic and environmental protection as soon as possible.
In theory, hydrogen is a carbon-free, pollution-free environmentally friendly fuel. When hydrogen is burned to generate energy, the product is only water, but scientists have also proved that it is very difficult to make hydrogen from water, re-storage hydrogen and use hydrogen.
The latest discovery by the University of Wisconsin-Madison may have given people a glimpse of the dawn. After the postdoctoral researcher of the university's chemistry department, Mark Krzywski, and Professor Jin Song (handbook transliteration) jointly created a new molybdenum disulfide structure, research shows that it can significantly speed up the hydrogen production of water.
The researchers deposited molybdenum disulfide nanostructures on a plate of graphite, followed by lithium molybdenum disulfide treatment to create another molybdenum disulfide structure with different properties. Scientists explained that just as carbon can be made into diamonds for beauty-loving women, as well as graphite for children's writing, molybdenum disulfide can be both semiconductor and metal because of its different structure. When molybdenum disulfide is grown on graphite, it is a semiconductor; but when it is treated with lithium it becomes metal. Studies have shown that molybdenum disulfide in the metal state has excellent catalytic properties.
Lokiwski said: "Like graphite consisting of a stack of easily peelable sheets, molybdenum disulfide is also composed of separable sheets. Previous studies have shown that catalytically active dots are located on the edge of the sheet. Lithium treatment plays a major role. Yes: Molybdenum disulfide is converted from a semiconductor state to a metal state; flakes are separated, more edges are created, the number of catalytically active sites is increased, and the catalytic performance is greatly improved.
The researchers said that the new material consists of the common elements molybdenum and sulfur, which are inexpensive. What's more, it completely avoids the usual catalyst in the hydrogen production of water - rare and expensive platinum. In order to reduce the cost of catalysts for hydrogen production from water, the majority of scientists use the method of reducing the use of platinum by making fine particles. However, we do not use platinum at all, and the new material also has good catalytic performance. Recent experiments have proposed a new method for improving the performance of catalysts."
Jin Song said: “Although the new materials allow the efficiency of hydrogen production from water to increase dramatically, they are still slightly inferior to platinum. Next, we will optimize various aspects of this process and explore the potential of related compounds. Finding ways to improve the performance of new materials.Mankind is facing many obstacles in the era of 'hydrogen economy', but the advantages of hydrogen fuel in such aspects as high fuel efficiency and less pollution are so obvious that we must continue to advance.We have made a few Milligram of this catalyst, in theory, can be mass-produced on this structure.†(Reporter Liu Xia)
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