Carbon-coated vanadium nitride electrocatalyst, preparation method and application

An electrocatalyst, vanadium nitride technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of high power consumption and high price, and achieve high controllability, high purity and crystallinity , the effect of uniform chemical composition

Inactive Publication Date: 2019-01-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen production by electrolysis of water is a large-scale hydrogen production method with simple operation and mature technology; however, the biggest problem at present is the high power consumption and the price of the most effecti

Method used

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  • Carbon-coated vanadium nitride electrocatalyst, preparation method and application
  • Carbon-coated vanadium nitride electrocatalyst, preparation method and application
  • Carbon-coated vanadium nitride electrocatalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] Step 1: Put 400mg of thiocyanuric acid, 54mg of vanadium trichloride and 0.5g of urea in a mortar for grinding to mix the raw materials uniformly, put the resulting mixture in a porcelain boat, and place the porcelain boat in a tube atmosphere In the furnace, and two furnace plugs on both sides of the tube.

[0024] Step 2: Pass inert gas into the tube, and then perform 8 times of air extraction and supplementation. Although the internal air is exhausted, no air supplementation will be performed after the last extraction. The pressure in the tube is controlled to -1~0MPa; the pressure is -1~0MPa In this case, raise the temperature to 700°C at a heating rate of 10°C / min and keep it warm for 3 hours; after the heat preservation, immediately open the gas valve and inert gas with 700~800sccm airflow to discharge the gas generated during the heat preservation process. Cooling is performed under argon flow.

[0025] figure 1 X-ray diffraction (XRD) pattern of th...

Example Embodiment

[0026] Example 2

[0027] Step 1: Put 377mg of thiocyanuric acid, 54mg of vanadium trichloride and 0.5g of urea in a mortar for grinding, so that the raw materials in the mortar are evenly mixed, and the resulting mixture is placed in a porcelain boat, and the porcelain boat is placed In a tubular atmosphere furnace, and two furnace plugs on both sides of the tube.

[0028] Step 2: Inject inert gas into the tube, and then perform 5 times of air extraction and supplementation. Although the internal air is exhausted, no air supplementation will be performed after the last extraction. The air pressure in the control tube is -1~0MPa; the air pressure is -1~0MPa In this case, raise the temperature to 800°C at a heating rate of 5°C / min, and keep it warm for 2h; immediately after the heat preservation, open the gas valve and inert gas with a flow of 700~800sccm to discharge the gas generated during the heat preservation process. Cooling is performed under argon flow.

[0029] figure 2 Th...

Example Embodiment

[0031] Example 3

[0032] Step 1: Put 400mg of thiocyanuric acid, 107mg of ammonium metavanadate and 0.3g of ammonium carbonate in a mortar for grinding, so that the raw materials in the mortar are evenly mixed, put the resulting mixture in a porcelain boat, and place the porcelain boat In a tubular atmosphere furnace with two furnace plugs on each side of the tube.

[0033] Step 2: Pass inert gas into the tube, and then perform 8 times of air extraction and supplementation. Although the internal air is exhausted, no air supplementation will be performed after the last extraction. The pressure in the tube is controlled to -1~0MPa; the pressure is -1~0MPa In this case, raise the temperature to 600°C at a temperature increase rate of 10°C / min, and keep it warm for 3h; after the heat preservation, immediately open the gas valve and inert gas with a flow of 700~800sccm to discharge the gas generated during the heat preservation process. Cooling is performed under argon flow.

[0034] ...

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Abstract

The invention provides a carbon-coated vanadium nitride electrocatalyst. Carbon-rich organic matter is used as a carbon source; metal vanadium salt is used as a vanadium source; urea, ammonium carbonate, ammonium hydrogencarbonate and the like are used as a nitrogen source; and carbon-coated vanadium nitride nanoparticles are obtained through one-step calcination after the constituents are uniformly mixed through a mechanical method. The carbon-coated vanadium nitride electrocatalyst has the advantages that the raw material is cheap; the synthesis method is simple; the controllability is high;the obtained vanadium nitride is nanoparticles and coated with amorphous carbon layers, so that the electrical conductivity of the material is enhanced; and the carbon-coated vanadium nitride nanomaterial prepared by the method has uniform chemical composition and higher purity and crystallinity, and exhibits hydrogen production catalytic activity to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of electrolytic water hydrogen production catalysts, and in particular relates to a carbon-coated vanadium nitride electrocatalyst, a preparation method and an application. Background technique [0002] Due to the shortage of energy and severe environmental pollution in today's society, hydrogen, as a storable, pollution-free and renewable high-quality energy carrier, has been extensively researched and developed. Hydrogen production by electrolysis of water is a large-scale hydrogen production method with simple operation and mature technology; however, the biggest problem at present is the high power consumption and the price of the most effective catalysts such as Pt, Pd and their alloys required for hydrogen production However, some non-noble metal catalysts including nickel or nickel-based materials, metal sulfides, selenides, carbides, nitrides, phosphides, etc. have been developed. Therefore, the dev...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06B01J27/24B82Y40/00
CPCB01J27/24B82Y40/00C25B1/04C25B11/091Y02E60/36
Inventor 曹丽云王琳琳冯亮亮黄剑锋冯李徐瑞何丹阳巩颖波
Owner SHAANXI UNIV OF SCI & TECH
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