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Tungsten nitride coated vanadium nitride powder as well as preparation method and application thereof

A technology of tungsten nitride coating and tungsten nitride is applied in the field of tungsten nitride coating vanadium nitride powder and its preparation, which can solve the problems of easy aggregation, inhibition of hydrogen production efficiency by specific surface area, and high synthesis temperature, and achieves the promotion of Synergistic effect, rich content, good crystallinity

Active Publication Date: 2021-07-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high synthesis temperature of single-phase nitrides, aggregation is easy to occur, and the small specific surface area inhibits the hydrogen production efficiency.

Method used

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  • Tungsten nitride coated vanadium nitride powder as well as preparation method and application thereof
  • Tungsten nitride coated vanadium nitride powder as well as preparation method and application thereof
  • Tungsten nitride coated vanadium nitride powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Weigh dimethylimidazole, vanadium chloride and sodium tungstate dihydrate according to the mass ratio of 60:10:24;

[0027] 2) Dry mix the above powders and grind them in an agate mortar for 30 minutes, put them into a porcelain boat, place the porcelain boat in a tube-type atmosphere furnace, and put two furnace plugs at each end of the tube with an interval of 5 cm;

[0028] 3) Introduce argon gas into the tube, and then carry out 4 times of pumping and replenishing air, and exhaust the air inside. After the last replenishing of gas, do not pump again, and enter the atmosphere with 20 sccm airflow, heat up at 5°C / min, and heat at 300 ℃ for 120 minutes, continue to heat up at 600 ℃ for 120 minutes;

[0029] 4) After the heat preservation is completed, cool down to room temperature and grind the black sample to obtain the target product VN@WN.

Embodiment 2

[0031] 1) Weigh dimethylimidazole, vanadium chloride and sodium tungstate dihydrate according to the mass ratio of 70:15:32;

[0032] 2) Dry mix the above powders and grind them in an agate mortar for 30 minutes, put them into a porcelain boat, place the porcelain boat in a tube-type atmosphere furnace, and put two furnace plugs at each end of the tube with an interval of 5 cm;

[0033] 3) Introduce argon gas into the tube, and then carry out 5 times of pumping and replenishing air, exhaust the air inside, and no longer pump after the last gas replenishment, enter the atmosphere with 30 sccm airflow, heat up at 10°C / min, and heat at 400 Keep warm for 180min at ℃, continue to heat up at 700℃ for 180min;

[0034] 4) After the heat preservation is completed, cool down to room temperature and grind the black sample to obtain the target product VN@WN.

Embodiment 3

[0036] 1) Weigh dimethylimidazole, vanadium chloride and sodium tungstate dihydrate according to the mass ratio of 80:20:40;

[0037] 2) Dry mix the above powders and grind them in an agate mortar for 30 minutes, put them into a porcelain boat, place the porcelain boat in a tube-type atmosphere furnace, and put two furnace plugs at each end of the tube with an interval of 5 cm;

[0038] 3) Introduce argon gas into the tube, and then carry out 6 times of pumping and replenishing air, and exhaust the air inside. After the last replenishing of gas, do not pump again, and enter the atmosphere with 40 sccm air flow, heat up at 5°C / min, and heat at 300 ℃ for 120 minutes, continue to heat up at 800 ℃ for 120 minutes;

[0039] 4) After the heat preservation is completed, cool down to room temperature and grind the black sample to obtain the target product VN@WN.

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Abstract

The invention discloses a preparation method of tungsten nitride coated vanadium nitride powder. The preparation method comprises the following steps: step 1, weighing dimethylimidazole, vanadium chloride and sodium tungstate dihydrate according to a mass ratio of (60-80): (10-20): (24-40); 2, dry-mixing and grinding the powder, putting the powder into a porcelain boat, putting the porcelain boat into a tubular furnace, and putting two furnace plugs at each of the two ends of the tubular furnace; 3, exhausting air in the tubular furnace , heating at the speed of 5-10 DEG C / min in the inert atmosphere, performing heat preservation for 120-180 min at the temperature of 300-400 DEG C, heating to 600-800 DEG C, and performing heat preservation for 120-180 min; and 4, after heat preservation is finished, cooling to the room temperature, and grinding the black sample to obtain a target product VN-WN. The electrocatalyst is low in cost, rich in content and excellent in performance, a new thought is provided for development of non-noble metal electrocatalysts, the method is easy to operate, safe and efficient, the product is good in crystallinity and high in purity, and the electrochemical performance is good when the product serves as an electrode material for hydrogen production through water electrolysis.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a tungsten nitride-coated vanadium nitride powder and a preparation method and application thereof. Background technique [0002] Hydrogen energy is considered as a promising green energy alternative to traditional fossil fuels because of its high energy density and environmental friendliness. Among various hydrogen production technologies, electrocatalytic water splitting is an effective and potential hydrogen production technology because of its low pollution to the environment and little influence from external environmental factors. But most importantly, this green and sustainable technology is largely limited by the huge energy consumption in practical large-scale applications, because the process of electrocatalytic water splitting mainly depends on two half-reactions, namely hydrogen production reaction (HER) and oxygen evolution reaction (OER). Both half-r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C25B1/04C25B11/091B82Y30/00B82Y40/00
CPCC01B21/062C01B21/0617C25B1/04B82Y30/00B82Y40/00C01P2002/72C01P2004/04C01P2004/84C01P2004/64Y02E60/36
Inventor 黄剑锋李帅楠冯亮亮曹丽云何丹阳冯李肖婷张晓
Owner SHAANXI UNIV OF SCI & TECH