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A carbon layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst and its preparation method and application

A technology of vanadium nitride nanometer and electrocatalyst, which is applied in the field of electrochemical energy, can solve the problem that the catalytic efficiency of hydrogen evolution needs to be improved, and achieve the effects of reducing size, easy control, and shape dispersion.

Active Publication Date: 2022-02-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

VN not only has a Pt-like d electron density of states, but also because of its low cost and rich content, so VN has attracted more attention as a hydrogen-producing electrocatalyst, but the hydrogen evolution catalytic efficiency of VN-based electrocatalysts still needs to be improved.

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  • A carbon layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst and its preparation method and application
  • A carbon layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst and its preparation method and application
  • A carbon layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst and its preparation method and application

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preparation example Construction

[0031] A preparation method of a tungsten-doped vanadium nitride nanoparticle composite electrocatalyst supported by an ultra-small carbon layer of the present invention comprises the following steps:

[0032] 1) First of all, according to the mass ratio of (40~60):(10~16):(6~12), the raw materials melamine: ammonium metavanadate: tungsten chloride are weighed in turn; melamine and ammonium metavanadate act as the reduction agent, because ammonia gas will be generated by pyrolysis in the high-temperature solid-phase process;

[0033] 2) Mix the weighed raw materials and grind them in an agate mortar for 20-40 minutes, put them into a porcelain boat, place the porcelain boat in a tube-type atmosphere furnace, and put two furnace plugs at both ends of the tube with an interval of 5cm ;

[0034] 3) Introduce a certain atmosphere into the tube atmosphere furnace to check the air tightness, and then carry out pumping and replenishing air for 4 to 6 times, even if the air inside is...

Embodiment 1

[0038] A preparation method of a tungsten-doped vanadium nitride nanoparticle composite electrocatalyst supported by an ultra-small carbon layer of the present invention comprises the following steps:

[0039] 1) First, weigh melamine: ammonium metavanadate: tungsten chloride according to the mass ratio of 40:10:6;

[0040] 2) Mix the weighed raw materials and grind them in an agate mortar for 20 minutes, put them into a porcelain boat, place the porcelain boat in a tube-type atmosphere furnace, and put two furnace plugs at both ends of the tube with an interval of 5 cm;

[0041] 3) Introduce hydrogen-argon mixed gas into the tube to check the air tightness, then pump and replenish air 4 times, exhaust the air inside, do not pump after the last gas replenishment, enter the atmosphere with an air flow of 20 sccm, and enter the atmosphere with 5 sccm ℃ / min heating up to 800 ℃, holding for 120min;

[0042] 4) After the incubation, cool down to room temperature and grind the blac...

Embodiment 2

[0044] A preparation method of a tungsten-doped vanadium nitride nanoparticle composite electrocatalyst supported by an ultra-small carbon layer of the present invention comprises the following steps:

[0045]1) First, take melamine: ammonium metavanadate: tungsten chloride according to the mass ratio of 50:12:9;

[0046] 2) Mix the weighed raw materials 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 place two furnace plugs at both ends of the tube with an interval of 5 cm;

[0047] 3) Introduce an argon atmosphere into the tube to check the air tightness, and then pump and replenish the air for 5 times, exhaust the air inside, do not pump after the last replenishment, and enter the atmosphere with an air flow of 30sccm, 10°C / min Heating up to 900°C and holding for 180min;

[0048] 4) After the incubation, cool down to room temperature and grind the black sample to obtain the ta...

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Abstract

The invention provides a carbon layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst and its preparation method and application, which belong to the technical field of electrochemical energy. The method comprises the following steps: mixing melamine, ammonium metavanadate and chloride The tungsten is mixed evenly and then ground. The mass ratio of melamine and ammonium metavanadate is (40-60): (10-16) to obtain a mixed powder; the mixed powder is heat-treated at 800-1200°C in a protective gas, and then Cooling to obtain a carbon layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst. The doping of W optimizes the electronic structure and crystallinity of VN, and the coating of C enhances the conductivity of the composite material, which not only provides a new idea for the synthesis of VN-based electrocatalytic materials, but also provides a further basis for the design of highly efficient hydrogen evolution catalysts. Active transition metal doping of nitrides offers a new approach.

Description

Technical field: [0001] The invention belongs to the technical field of electrochemical energy, and specifically relates to a carbon-layer-supported tungsten-doped vanadium nitride nanoparticle composite electrocatalyst, a preparation method and application thereof. Background technique: [0002] Due to the imminent depletion of fossil fuels worldwide and increasing greenhouse gas emissions, there is an urgent need to develop alternative sustainable and eco-friendly energy sources. As a carbon-neutral fuel, hydrogen has attracted widespread attention due to its zero emission of pollutants and abundant reserves during use. At present, electrocatalytic water splitting technology has become a sustainable hydrogen production technology due to its high efficiency and high purity (the reaction formula is 2H 2 O→O 2 +2H 2 ), see the literature [Yan Y, He T, Zhao B, etal.Metal / Covalent-ganic Frameworks-Based Electrocatalysts for Water Splitting[J].Journal of Materials Chemistry A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 黄剑锋李帅楠冯亮亮曹丽云何丹阳张晓肖婷陈俊生
Owner SHAANXI UNIV OF SCI & TECH