Tungsten Carbide Nuclear Shell Structure / Tungsten Carbide Composite Electro Catalytic Performance
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- Category: Tungsten Information
- Published on Wednesday, 25 October 2017 16:24
Tungsten carbide can be used as a catalyst in the field of chemical catalysis and electro catalysis because of its platinum like catalytic performance,
It is not easy to be poisoned by CO, H2S and other gases in the process of catalytic reaction. But in practical application, in addition to the price, tungsten carbide can not completely replace the catalytic role of platinum, which is mainly conductive tungsten carbide poor performance, so the catalytic activity is less than platinum.
Some scholars put forward the preparation for carbide (Fe3W3C) and tungsten carbide (WC) new ideas of core-shell structure composite materials. This is because, on the one hand, Fe3W3C and WC were electro catalytic oxidation of methanol had better catalytic activity; On the other hand, Fe3W3C has good conductivity; and more importantly, the core-shell composite materials can control the properties of the materials by using the characteristics of the core and shell, which can significantly enhance the catalytic properties of the composites.
The yellow large specific surface area and excellent adsorption performance characteristics, using coating technology will ammonium metatungstate uniformly adsorbed on the outer surface, the use of iron and iron in Fe3W3C doped tungsten carbide can be formed in the carbonization process, to enhance the characteristics of conductive composite material, Fe3W3C and WC composites with core-shell structure were prepared by surface coating and in situ reduction and carbonization.
Core shell composite materials have certain catalytic activity for methanol in alkaline, neutral and acidic solutions, and are all higher than those of mesoporous hollow spherical tungsten carbide and granular tungsten carbide; The electrocatalytic activity of core-shell composite materials is related not only to their phase composition, but also to their microstructural characteristics. These results indicate that the electrocatalytic activity of the composite can be controlled by changing the properties of the reaction system and controlling the phase and structure characteristics of the material itself. The above results fully indicate that core-shell structure is one of the effective ways to improve the electrocatalytic activity of tungsten carbide.
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