Tungsten Carbide Nanocrystals
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- Category: Tungsten Information
- Published on Wednesday, 15 November 2017 21:53
Tungsten carbide has high hardness, good wear resistance and excellent chemical stability. It is widely used in machining tools, corrosion resistant parts and other fields.
In recent years, with the development of new energy battery, it was also found that the tungsten carbide is similar to the noble metal Pt catalyst has high catalytic properties, hydrogen oxidation function, therefore, the tungsten carbide nano crystal click rate increased again.
In the current study, tungsten carbide nanocrystals can be divided into four steps from zero dimensional to three-dimensional. The different dimensions of tungsten carbide micro nanocrystals were prepared by a variety of methods, there are many problems, such as the tungsten carbide phase purity, complex process, difficult to achieve industrial production etc..
1. Zero dimensional tungsten carbide micro nano crystal are quantum dots and porous micro nano spheres, quantum dots is mainly used for the catalyst, and the porous microspheres are mainly used for catalyst or catalyst carrier.
2. One dimensional tungsten carbide nanocrystals mainly consist of nanowires, nano chains, nanobelts and nanotubes. Tungsten carbide nanowires have good field emission properties, as well as high resolution and good oxidation resistance. They can be used as scanning tunneling microscope (STM) probes and field emission devices. In addition, tungsten carbide nanowires can also be used to strengthen cemented carbide, making printed circuit board carbide micro drill.
3. In recent years, the attention of two-dimensional materials is mainly focused on graphene and two transition metal sulfides such as tungsten disulfide and molybdenum disulfide.
4. Three dimensional tungsten carbide micro nano crystals are mainly used in the catalysis of new energy batteries, that is to replace Pt noble metal catalysts. Taking methanol fuel cell as an example, the use of three-dimensional ordered porous structure (3DOM) tungsten carbide as carrier can greatly reduce the amount of Pt, and show a good catalytic effect in the case of less Pt loading.
In summary, tungsten carbide micro nano crystal has very important application prospect in the field of fuel cells and water photolysis, so for the mass production of high quality tungsten carbide micro nano crystal method, and applied to the actual production will continue to be the focus for a long time in the future of people.
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