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Pure-phase polygonal W2C nano material and preparation method thereof

A nanomaterial, polygonal technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of high activity, difficult synthesis of C nanomaterials, low activity, etc., and achieves mild preparation conditions. Environmentally friendly, simple and easy-to-use effects

Active Publication Date: 2020-07-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome the small specific surface area, low activity and high activity of existing tungsten carbide materials. 2 C nanomaterials are difficult to synthesize and other defects, providing a phase-pure polygonal W with high HER activity 2 C nanometer material and preparation method thereof

Method used

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  • Pure-phase polygonal W2C nano material and preparation method thereof
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  • Pure-phase polygonal W2C nano material and preparation method thereof

Examples

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preparation example Construction

[0049] The advantages of the preparation method provided by the application are as follows:

[0050] (1) The precursors used in this method are all inorganic substances, and the W is controlled by controlling the amount of water added. 2 C exposed edges, by controlling the heat treatment temperature to control W 2 The particle size of C crystals realizes the generation of pure phase W 2 C while controlling the morphology of the material;

[0051] (2) The pure phase W prepared by this method 2 C nanoparticles have a nearly dodecahedral shape, and the particle size can range from 100 to 500nm;

[0052] (3) The method is simple and easy, the preparation conditions are mild, the environment is friendly, and industrial mass production can be realized.

Embodiment 1

[0055] Dissolve 5mmol of ammonium tungstate (ie 15.2129g) in 20mL of ethylene glycol solution, place it in a water bath at 80°C and stir for 8 hours to obtain a uniform white solution. Then, 32 mmol of melamine (ie 4.03584 g) was dissolved in another 20 mL of ethylene glycol solution, and deionized water with a volume 0.4 times that of the ethylene glycol solution was added, placed in a water bath at 80°C and stirred for 8 hours to obtain a uniform white solution. The above two white solutions were mixed and stirred at 25°C for 1 h to obtain a white flocculent precipitate. Afterwards, the white precipitate was collected by centrifugation, washed three times with ethanol, and dried in a vacuum oven at 70° C. for 12 h. Finally, the collected precipitate was placed in 95% H 2 Heat treatment at 900℃ for 2h in 5% Ar atmosphere to obtain pure phase W 2 C nanomaterials, such as figure 1 Shown in the W-2-900 spectral line in the XRD pattern of.

[0056] The particle size of prepar...

Embodiment 2

[0058] 32mmol melamine (ie 4.03584g) was dissolved in 20mL ethylene glycol solution, and deionized water with a volume 0.2 times that of the ethylene glycol solution was added, and other operating conditions were the same as in Example 1. The structure of the obtained material is the pure phase W 2 C, such as figure 1 Shown in the W-1-900 spectral line in the XRD pattern of the XRD, particle diameter is about 250nm (table 1), and morphology is nearly dodecahedral, as image 3 The SEM photographs in a and b are shown.

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Abstract

The invention provides a pure-phase polygonal W2C nano material and a preparation method thereof. The preparation method comprises the following steps of: 1), mixing and stirring a tungsten source andethylene glycol to be uniform, and obtaining a first solution; 2) uniformly mixing and stirring a carbon source, ethylene glycol and water to obtain a second solution; 3) uniformly mixing and stirring the first solution and the second solution to obtain a turbid liquid, and separating out a solid; and 4) carrying out heat treatment on the solid obtained in the step 3) in a reducing atmosphere toobtain the pure-phase polygonal W2C nanomaterial. According to the method, the pure-phase, high-surface-area and high-activity W2C nanomaterial can be prepared under the conditions of no toxicity, noharm and no addition of organic matters.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to an environment-friendly preparation of pure phase polygonal structure W 2 C nanomaterials approach. Background technique [0002] Tungsten carbide (WC and W 2 C) Due to the d-band electron density of states similar to that of Pt, it is a powerful alternative to platinum-based catalysts and can be widely used in the hydrogen evolution half reaction (HER) of water electrolysis to enhance its reaction efficiency. In recent years, especially a series of studies on the performance of IVB-VIB transition metal carbides under acidic conditions conducted by Wirth et al. in 2012 pointed out that tungsten carbide has the best catalytic activity, even better than that which has been applied in commercial all-aluminum oxidation Commercial Mo at the Hydrogen Production and Evolution End of Reductive Flow Batteries Combined with Water Electrolysis x C, has i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J35/02
CPCB01J27/22B01J35/33B01J35/40
Inventor 孟歌崔香枝施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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