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Preparation method and application of VN@WN nanoparticle with electrocatalysis function

A nanoparticle and electrocatalytic technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of incapable of large-scale industrial production, hindrance to practical application, high price of platinum, etc., and achieve good hydrogen production performance , easy industrial production, and low production cost

Inactive Publication Date: 2019-12-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the scarcity and high price of platinum hinder its practical application in fuel cell devices.
[0003] Although some noble metals, such as nanostructured iridium and ruthenium and their oxides, have relatively low overpotentials during hydrogen production in acidic and alkaline aqueous solutions, their rare abundance and high cost preclude their large-scale scale industrial production

Method used

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  • Preparation method and application of VN@WN nanoparticle with electrocatalysis function
  • Preparation method and application of VN@WN nanoparticle with electrocatalysis function
  • Preparation method and application of VN@WN nanoparticle with electrocatalysis function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) First, press dicyandiammonium, ammonium metavanadate, and phosphotungstic acid. C 2 h 4 N 4 :NH 4 VO 3 :H 3 o 40 PW 12 .xH 2 The mass ratio of O=50:5:2 mixes;

[0023] 2) Grind the above mixture for 20 minutes and pass through 60 sieves to obtain the mixture, put the mixture 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;

[0024] 3) Introduce the inert gas argon into the tubular atmosphere furnace, perform 3 times of pumping and replenishing air, exhaust the air inside, control the air pressure in the tube to -1~0MPa, heat to 700°C at a heating rate of 10°C / min and keep it warm 180min;

[0025] 4) The sample obtained after cooling was ground in a mortar for 20 min to obtain VN@WN nanoparticles.

Embodiment 2

[0027] 1) First, press dicyandiammonium, ammonium metavanadate, and phosphotungstic acid. C 2 h 4 N 4 :NH 4 VO 3 :H 3 o 40 PW 12 .xH 2 The mass ratio of O=50:5:3 is mixed;

[0028] 2) Grind the above mixture for 25 minutes and pass through 60 sieves to obtain the mixture, put the mixture 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;

[0029] 3) Introduce the inert gas argon into the tube atmosphere furnace, perform 3 times of pumping and replenishing, exhaust the air inside, control the pressure inside the tube to -1~0MPa, heat to 750°C at a heating rate of 10°C / min and keep it warm 160min;

[0030] 4) The sample obtained after cooling was ground in a mortar for 22 minutes to obtain VN@WN nanoparticles.

Embodiment 3

[0032] 1) First, press dicyandiammonium, ammonium metavanadate, and phosphotungstic acid. C 2 h 4 N 4 :NH 4 VO 3 :H 3 o 40 PW 12 .xH 2 The mass ratio of O=50:5:2.5 mixes;

[0033] 2) Grind the above mixture for 30 minutes and pass through 60 sieves to obtain the mixture, put the mixture 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;

[0034] 3) Introduce the inert gas argon into the tube-type atmosphere furnace, perform 3 times of pumping and replenishing air, exhaust the air inside, control the pressure in the tube to -1~0MPa, heat to 800°C at a heating rate of 10°C / min and keep it warm 150min;

[0035] 4) The sample obtained after cooling was ground in a mortar for 28 min to obtain VN@WN nanoparticles.

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Abstract

The invention discloses a preparation method and application of a VN@WN nanoparticle with an electrocatalysis function. The preparation method comprises the following steps: firstly, grinding a mixture of dicyandiamide, ammonium metavanadate and phosphotungstic acid, carrying out sieving with a 60-mesh sieve to obtain a mixture, putting the mixture into a porcelain boat, putting the porcelain boatinto a tubular atmosphere furnace, and respectively placing two furnace plugs at the two ends of a tube at an interval of 5 cm; introducing inert gas into the tubular atmosphere furnace to exhaust air in the tube, controlling the inner air pressure of the tube to be -1 MPa to 0 MPa, heating the tube to 700 DEG C to 900 DEG C at a heating rate of 10 DEG C / min, and maintaining the tube at the temperature for 120 min to 180 min; and carrying out cooling to obtain a sample and grinding the cooled sample in a mortar to obtain the VN@WN nanoparticle. The VN@WN nanoparticle with the electrocatalysisfunction prepared by using the preparation method is applied to the enhancement of hydrogen production activity. The VN@WN nanoparticle prepared by the method has an electrocatalytic function, can provide a clean and sustainable energy source for electrolysis of water, and is capable of eliminating the obstacle that a high-cost platinum-based material is widely applied to the industry. The electrocatalyst is simple in preparation process, good in hydrogen production performance and good in stability and circularity.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and specifically relates to a preparation method and application of VN@WN nanoparticles with electrocatalytic function applied in the field of enhancing hydrogen production by electrolysis of water. Background technique [0002] Currently, the technologies of supercapacitors, fuel cells, lithium-ion batteries and solar cells have attracted enough attention in reducing the consumption of fossil fuels. So far, platinum-based nanomaterials have been the main and better electrocatalysts to promote hydrogen production. However, the scarcity and high price of platinum hinder its practical application in fuel cell devices. [0003] Although some noble metals, such as nanostructured iridium and ruthenium and their oxides, have relatively low overpotentials during hydrogen production in acidic and alkaline aqueous solutions, their rare abundance and high cost preclude their large-scale large-scale in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCB01J27/24C25B1/04C25B11/04B01J35/33Y02E60/36
Inventor 黄剑锋李帅楠冯亮亮曹丽云冯永强牛梦凡张晓肖婷
Owner SHAANXI UNIV OF SCI & TECH
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