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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 effective catalysts such as Pt, Pd and their alloys required for hydrogen production Some non-noble metal catalysts including nickel or nickel-based materials, metal sulfides, selenides, carbides, nitrides, phosphides, etc. have been developed

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

Embodiment 1

[0023] Step 1: Grind 400mg of thiocyanuric acid, 54mg of vanadium trichloride and 0.5g of urea in a mortar, mix the raw materials evenly, put the resulting mixture into a porcelain boat, and place the porcelain boat in a tubular atmosphere Furnace, and two furnace plugs on each side of the tube ends.

[0024] Step 2: Inject inert gas into the tube, and then carry out 8 times of pumping and replenishing air, even if the air inside is exhausted, no gas will be replenished after the last pumping, and the air pressure in the tube is controlled to be -1~0MPa; when the air pressure is -1~0MPa Under normal circumstances, raise the temperature to 700°C at a rate of 10°C / min, and keep it warm for 3 hours; after the heat preservation is over, open the air valve immediately, let the inert gas flow in at 700~800sccm, and discharge the gas generated during the heat preservation process. Cooling was performed under argon flow.

[0025] figure 1 The X-ray diffraction (XRD) spectrum of the ...

Embodiment 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, put the resulting mixture into a porcelain boat, and place the porcelain boat on Tube-type atmosphere furnace, and two furnace plugs on each side of the tube ends.

[0028] Step 2: Inject an inert gas into the tube, and then carry out 5 times of pumping to replenish the air, exhaust the air inside, and do not replenish the gas after the last pumping, and control the air pressure in the tube to -1~0MPa; when the air pressure is -1~0MPa Under normal circumstances, raise the temperature up to 800°C at a rate of 5°C / min, and keep it warm for 2 hours; after the heat preservation is over, open the air valve immediately, let the inert gas flow in at 700~800sccm, and discharge the gas generated during the heat preservation process. Cooling was performed under argon flow.

[0029] figure 2 Scanning electron m...

Embodiment 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 into a porcelain boat, and place the porcelain boat In a tube-type atmosphere furnace, there are two furnace plugs at each end of the tube.

[0033] Step 2: Inject inert gas into the tube, and then carry out 8 times of pumping and replenishing air, even if the air inside is exhausted, no gas will be replenished after the last pumping, and the air pressure in the tube is controlled to be -1~0MPa; when the air pressure is -1~0MPa Under normal circumstances, raise the temperature to 600°C at a rate of 10°C / min, and keep it warm for 3 hours; after the heat preservation is over, open the air valve immediately, let inert gas flow in at 700~800sccm, and discharge the gas generated during the heat preservation process. Cooling was 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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