Diselenide/layered double hydroxide composite water electrolysis catalytic material as well as preparation method and application thereof

A layered bimetallic, diselenide technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrolysis processes, etc., can solve the problems of increasing the voltage of the electrolytic water tank, the cost of hydrogen production, and the overpotential of the oxygen evolution reaction. Achieve excellent water electrolysis catalytic performance, low hydrogen evolution overpotential, and the effect of solving boundary effects

Active Publication Date: 2020-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in addition to highly active HER hydrogen evolution catalytic materials, another important bottleneck that limits the large-scale application of electrolyzed water for hydrogen production is the high overpotential of the oxygen evolution reaction (OER), which increases the voltage of the electrolyzed water tank and the cost of hydrogen production.

Method used

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  • Diselenide/layered double hydroxide composite water electrolysis catalytic material as well as preparation method and application thereof
  • Diselenide/layered double hydroxide composite water electrolysis catalytic material as well as preparation method and application thereof
  • Diselenide/layered double hydroxide composite water electrolysis catalytic material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] A kind of preparation of molybdenum diselenide / MgAl hydrotalcite composite catalytic material of the present invention, it specifically comprises the following steps:

[0081] (1) Add 0.03mol magnesium nitrate, 0.015mol aluminum nitrate, 0.01mol sodium molybdate and 0.1mol sodium hydroxide to 100mL water, stir and react at 45°C for 1h; then raise the temperature to 85°C for 6h; crystallize After the end, centrifuge and wash, filter after 30 minutes of ultrasonic field action, disperse the filter cake in 50mL water to make hydrotalcite prepolymer suspension;

[0082] (2) After stirring 0.632g of selenium powder and 10mL of hydrazine hydrate in a three-necked flask for 30min, add 40mL of the above-mentioned hydrotalcite prepolymer suspension and ultrasonically disperse it, place it in a high-pressure reactor, and heat up at a rate of 5 ° C / Raise the temperature to 200°C under the condition of 1 min, keep the temperature for 720 minutes (when 360 minutes, take out the ul...

Embodiment 2

[0117] The preparation method is similar to Example 1, the only difference is that the hydrothermal reduction reaction temperature in step 2 is increased from 200°C to 230°C, and the others are the same, and the selenium disulfide / MgAl hydrotalcite composite catalytic material L is prepared.

[0118] Using the same test method as in Example 1, the performance of the total hydrolysis of the composite catalytic material L was tested. It was found that the current density reached 10mV / cm 2 , the hydrogen evolution overpotential of the composite catalytic material M is 243mV, and the oxygen evolution potential is 1.49V.

[0119] The study found that an appropriate increase in the hydrothermal reduction temperature is conducive to the improvement of the electrocatalytic performance of the composite material.

Embodiment 3

[0121] The preparation method is similar to that of Example 1, except that the hydrothermal reduction reaction temperature in step 2 is increased from 200°C to 250°C, and the others are the same, and the selenium disulfide / MgAl hydrotalcite composite catalytic material M is prepared.

[0122] Using the same test method as in Example 1, the performance of the total hydrolysis of the composite catalytic material M was tested. It was found that the current density reached 10mV / cm 2 , the hydrogen evolution overpotential of the composite catalytic material M is 326mV, and the oxygen evolution potential is 1.58V.

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Abstract

The invention discloses a diselenide / layered double hydroxide composite water electrolysis catalytic material which is a material with diselenide growing on the surface of layered double hydroxide in-situ. Diselenide is molybdenum diselenide and / or tungsten diselenide. The invention also provides an in-situ anion intercalation and in-situ self-assembly preparation method of the diselenide / layereddouble hydroxide composite water electrolysis catalytic material under ultrasonic enhancement. The invention also discloses an application of the diselenide / layered double hydroxide composite water electrolysis catalytic material as an HER and / or OER material. The prepared diselenide / layered double hydroxide composite water electrolysis catalytic material not only has a low hydrogen evolution over-potential, but also has oxygen evolution reaction (OER) over-potential basically equivalent to that of noble metal, and is very excellent in performance. Therefore, the catalytic material is of greatsignificance to the improvement of the water electrolysis hydrogen production level.

Description

technical field [0001] The invention relates to the technical field of hydrogen energy preparation and energy storage batteries, in particular to a diselenide / layered double metal hydroxide composite water electrolysis catalytic material composite full hydrolysis electrode material. Background technique [0002] The rapid development of modern cities and industries has led to the increasing consumption of fossil energy and environmental pollution. The development and utilization of new renewable energy technologies is an inevitable trend of social development. Among them, hydrogen with high energy density and zero pollution is considered to be an effective alternative. One of the new energy sources of fossil energy. There are many technical methods for generating hydrogen, but considering cost and efficiency factors, electrocatalytic hydrogen production technology has been widely studied due to the advantages of low cost and high efficiency, but there are still many problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J35/10C25B1/04C25B11/06H01M4/90
CPCB01J27/0573B01J35/0033B01J35/1004H01M4/90H01M4/9016C25B1/04C25B11/04Y02E60/36Y02E60/50
Inventor 曹占芳余超钟宏王帅
Owner CENT SOUTH UNIV
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