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Angstrom-scale carbide and preparation method thereof

A technology of carbide and metal carbide, applied in the field of materials, can solve the problems of underutilization and inability to fully exert the synergistic effect of precious metals, and achieve the effect of reducing preparation costs and improving utilization

Inactive Publication Date: 2015-09-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned nanoscale carbides used as electrocatalyst supports are still too large to be fully utilized by themselves and cannot fully exert the synergistic effect on noble metals.

Method used

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  • Angstrom-scale carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 0.00003 moles of ammonium metatungstate, dissolve it in 100 ml of water, add 10 g of D201 macroporous strongly basic anion exchange resin, stir evenly for 6 hours, pour out the liquid phase, and keep the solid phase. The solid phase was dried in a drying oven at 80 °C for 5 hours, then placed in a tube furnace, and calcined at 800 °C for 1 hour under the protection of nitrogen to obtain Angstrom scale tungsten carbide (rod), such as figure 1 As shown, its average width is 0.9 nm. Such as figure 2 As shown, the mass activity of the obtained tungsten carbide-supported platinum catalyst for oxygen reduction is 237 mA / mg platinum, which is 2.0 times that of the commercial carbon-supported platinum catalyst (TKK, Japan, 120 mA / mg platinum) ( figure 2 ).

Embodiment 2

[0025] Change the amount of ammonium metatungstate substance to 0.000006 moles, and other steps are the same as in Example 1. Angstrom-scale tungsten carbide (dot-like) was obtained with an average diameter of 0.5 nm.

Embodiment 3

[0027] Take 0.00000014 moles of ammonium metatungstate, dissolve it in 10 ml of water, add 10 g of D314 macroporous weakly basic anion exchange resin, stir evenly for 0.3 hours, pour out the liquid phase, and keep the solid phase. Dry the solid phase in a drying oven at 50 °C for 48 hours, then place it in a tube furnace, and bake it at 600 °C for 24 hours under the protection of nitrogen to obtain Angstrom scale tungsten carbide (dot shape), with an average diameter of 0.3 Nano.

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Abstract

The invention belongs to the field of materials, and particularly discloses an angstrom-level transition metal carbide and a preparation method thereof. The angstrom-level transition metal carbide is prepared according to the following technical scheme: preparing a transition metal precursor into a solution, then adding with ion exchange resin as a carbon source, mixing and stirring, then separating the solid and liquid phases, collecting the solid phase, and finally drying and roasting the solid phase so as to obtain the angstrom-level transition metal carbide. The transition metal carbide takes carbon as a base body, and comprises one or more of tungsten carbide, molybdenum carbide, zinc carbide, chromium carbide, nickel carbide, ferrum carbide, cobalt carbide and titanium carbide.

Description

technical field [0001] The invention relates to an Angstrom-scale carbide that can be used as a catalyst or electrocatalyst carrier and a preparation method thereof, belonging to the field of materials. Background technique [0002] Carbide has the characteristics of high strength, high hardness and high melting point, and is widely used in industries such as national defense, chemical industry, electronics and mechanical processing. [0003] In the machining industry, carbides are used as wear-resistant and cutting materials. However, due to the high melting point of carbide, it is difficult to form a uniform coating by self-sintering, and metal cobalt is generally used to weld carbide particles, which will inevitably reduce its corrosion resistance, wear resistance and hardness. Studies have found that when the particle size of tungsten carbide is reduced from micron to nano, tungsten carbide will be welded at 500°C to form a homogeneous coating, which greatly improves it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C01B31/30C01B31/34C01B32/949
Inventor 闫早学谢吉民张美萍章明美高丽娜
Owner JIANGSU UNIV
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