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Nanometer floriform vanadium disulfide/hydroxy vanadium oxide difunctional composite electrocatalyst and preparation method thereof

A vanadium disulfide, hydroxyl oxidation technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of electrochemical application limitations, high cost, etc., and achieve a simple synthesis route, low synthesis Uniform effect of temperature and chemical composition

Inactive Publication Date: 2019-01-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their scarcity and high cost limit their electrochemical applications

Method used

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  • Nanometer floriform vanadium disulfide/hydroxy vanadium oxide difunctional composite electrocatalyst and preparation method thereof
  • Nanometer floriform vanadium disulfide/hydroxy vanadium oxide difunctional composite electrocatalyst and preparation method thereof
  • Nanometer floriform vanadium disulfide/hydroxy vanadium oxide difunctional composite electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Soak the graphite paper in pure acetone solution for 5 minutes, then immerse the graphite paper in 3mol / L hydrochloric acid for 5 minutes, and finally wash it with ethanol and deionized water alternately for 3 times, vacuum at 25°C Obtain the treated graphite paper after drying for 15h;

[0021] (2) Weigh NH 4 VO 3 and C 2 h 5 Add NS to 20ml deionized water at the same time to control NH 4 VO 3 :C 2 h 5 The molar ratio of NS is 1:10, and 1ml of ammonia water is added. At this time, the concentration of the vanadium source is 0.05mol / L, and the concentration of the sulfur source is 0.5mol / L. Stir magnetically at room temperature for 30min to obtain a clear solution A;

[0022] (3) Put the graphite paper processed in step (1) into the reaction liner, then pour solution A into the reaction liner and seal it, then install the liner in the outer kettle and fix it in a homogeneous reactor , then reacted at 160°C for 18h;

[0023] (4) After the hydrothermal reacti...

Embodiment 2

[0025] (1) Soak the graphite paper in pure acetone solution for 10 minutes, then immerse the graphite paper in 2mol / L hydrochloric acid for 10 minutes, and finally rinse it with ethanol and deionized water for 4 times, and vacuum at 35°C Obtain the treated graphite paper after drying for 14h;

[0026] (2) Weigh NH 4 VO 3 and C 2 h 5 Add NS to 25ml deionized water at the same time to control NH 4 VO 3 :C 2 h 5 The molar ratio of NS is 1:6, and 2ml of ammonia water is added. At this time, the concentration of the vanadium source is 0.08mol / L, and the concentration of the sulfur source is 0.48mol / L. Stir magnetically at room temperature for 40min to obtain a clear solution A;

[0027] (3) Put the graphite paper processed in step (1) into the reaction liner, then pour solution A into the reaction liner and seal it, then install the liner in the outer kettle and fix it in a homogeneous reactor , then reacted at 180°C for 20h;

[0028] (4) After the hydrothermal reaction is...

Embodiment 3

[0030] (1) Soak the graphite paper in pure acetone solution for 15 minutes, then immerse the graphite paper in 4mol / L hydrochloric acid for 10 minutes, and finally wash it with ethanol and deionized water alternately for 3 times, vacuum at 40°C Obtain the treated graphite paper after drying for 12h;

[0031] (2) Weigh NH 4 VO 3 and C 2 h 5 Add NS to 30ml deionized water at the same time to control NH 4 VO 3 :C 2 h 5 The molar ratio of NS is 3:14, and 3ml of ammonia water is added. At this time, the concentration of the vanadium source is 0.1mol / L, and the concentration of the sulfur source is 0.467mol / L. Stir magnetically at room temperature for 45min to obtain a clear solution A;

[0032] (3) Put the graphite paper processed in step (1) into the reaction liner, then pour solution A into the reaction liner and seal it, then install the liner in the outer kettle and fix it in a homogeneous reactor , then reacted at 180°C for 22h;

[0033] (4) After the hydrothermal rea...

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Abstract

The invention provides a nanometer floriform vanadium disulfide / hydroxy vanadium oxide difunctional composite electrocatalyst. The composite electrocatalyst has the ball-flower-shaped appearance formed by stacking VS2 / VOOH nanometer sheet layers. The composite electrocatalyst is obtained by the following method: conductive carbon base is soaked in a dispersoid containing NH4VO3, C2H5NS and ammonium hydroxide; hydrothermal reaction is performed to obtain VS2 / VOOH nanoflowers growing on the conductive carbon base. The method has the advantages that large-scale equipment and harsh reaction conditions are not needed; the raw materials are cheap and can be easily obtained; the cost is low; the yield is high. The nanoflower-shaped structure of the product is favorable for the full contact of electrolyte and VS2 / VOOH; the free in and out of ions is facilitated; further, the electrochemical performance can be greatly enhanced. The product chemical composition is uniform; the purity is high; the appearance is uniform; when the composite electrocatalyst is used as an electrolytic water electrode material, excellent electrochemical performance can be shown; under the current density of 100mA / cm<2>, the overpotential is about 709mV.

Description

technical field [0001] The invention belongs to the technical field of electrolytic water catalysts, in particular to a nano-flower-shaped vanadium disulfide / vanadium oxyhydroxide bifunctional composite electrocatalyst and a preparation method thereof. Background technique [0002] Electrocatalytic water splitting technology is one of the most promising ways to produce hydrogen and oxygen, and it is a technology with the most potential to develop sustainable and clean energy. So far, the most efficient electrocatalysts for water electrolysis are noble metals, such as platinum (Pt), and expensive / toxic OER oxides, such as iridium oxide (IrO 2 ) and ruthenium oxide (RuO 2 ). However, their scarcity and high cost limit their electrochemical applications. Therefore, the development of abundant and highly active electrocatalysts is the focus of many researchers. [0003] Studies have shown that vanadium disulfide has a unique layered structure, which is conducive to the adsor...

Claims

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Application Information

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IPC IPC(8): B01J27/04
CPCB01J27/04
Inventor 黄剑锋徐瑞冯亮亮曹丽云巩颖波王潇
Owner SHAANXI UNIV OF SCI & TECH
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