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)
Matters concerning the export of graphite
Over the years, China has been the most * big exporter of Natural Graphite products, in deep processing of graphite products technology leading developed countries, is against the natural graphite "with purchase and adopt a generation of" strategy, and technology blockade, natural graphite as a kind of non-renewable resources, with very good foreground countries limit zhi, its export of primary products, such as export carbon rods, artificial graphite, Graphite Block, pre-baked anode, etc., need to be dealt with the dual-use items.
The price of natural Graphite Powder is determined by three main factors: carbon content, moisture and particle size distribution.
1. The higher the carbon content, the greater the purity of graphite, so the price will rise in the form of the acceleration line (i.e., the higher the purity, the more complex the production process, and the higher the price increases).
The larger the scale, the lower the natural content and the higher the price. Conversely, the smaller the particulate matter, the less content in nature and the higher the price. Therefore, for natural graphite, the price of the normal (i.e., the material at the top of the sieve) is high. In the positive eye, the smaller the number, the bigger the scale and the higher the price. In negative eyes, the larger the number, the smaller the scales, the higher the price, the lower the price of negative items.
Artificial graphite HS codes for 3801100090, customs supervision conditions for export license of dual-use items and technologies, when customs clearance in addition to submit normal trade documents, and shall be submitted to the ministry of commerce issued "export license of dual-use items and technologies".
Materials for application of electronic key for dual-use items:
1. Application of electronic key for approval and approval (seal of enterprise official seal and approval seal)
2. Copy of business license (seal of enterprise)
3. Photocopy of the record registration form of foreign trade operator or a copy of the approval certificate of the foreign-invested enterprise (with the official seal of the enterprise)
4. Applicant's identity card and copy of the company's legal person identity card (seal enterprise seal)
5. Service contract (please refer to the representative office or office)
6. Copy of bank payment receipt (wire transfer voucher, bill)
Information on import and export of dual-use items
1. Trade contract
2. Export (import) packing list
3. Certificate of final user and end-use abroad
Application for export license of sensitive items and technologies of the People's Republic of China, etc.
Graphite Export Packing,Graphite Packaging,Graphite Block Packaging,Graphite Powder Packaging
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