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Electrocatalyst for efficiently decomposing water into hydrogen and oxygen and preparation method of electrocatalyst

An electrocatalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of low electron transfer rate, expensive catalyst, low conductivity, etc., and achieve optimized morphology and structure, good Electron conductivity and efficiency improvement effect

Inactive Publication Date: 2017-11-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main electrocatalyst materials with excellent performance are precious metals such as Pt, Ru, Ir and their oxides. However, due to the high price, scarce content and easy poisoning of these catalysts, their further application in the field of electrolysis of water is limited. Therefore, It is of great research significance to develop an efficient non-noble metal electrocatalyst
[0004] Transition metal oxides and sulfides such as Co 3 o 4 , NiO,CoS 2 , NiS 2 With a spinel or pyrite structure, it is a common hydrogen evolution catalyst, but its application in OER and HER water splitting is limited due to its low electrical conductivity and low electron transport rate.
The catalysts reported for bifunctional water electrolysis mainly include NiFe-LDH, NiCo 2 S 4 Nanowires, Co-P compounds, etc., all have good catalytic properties, but it is still a difficult problem for a catalyst to meet the requirements of low overpotential and high stability at the same time.

Method used

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  • Electrocatalyst for efficiently decomposing water into hydrogen and oxygen and preparation method of electrocatalyst
  • Electrocatalyst for efficiently decomposing water into hydrogen and oxygen and preparation method of electrocatalyst
  • Electrocatalyst for efficiently decomposing water into hydrogen and oxygen and preparation method of electrocatalyst

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preparation example Construction

[0038] The preparation method of the above-mentioned electrocatalyst for efficiently decomposing water to produce hydrogen and oxygen, the method comprises the following steps:

[0039] Step 1) Mix divalent nickel salt and divalent cobalt salt with hexamethylenetetramine according to a certain ratio, and then add methanol solution and stir evenly to obtain a mixed solution;

[0040] Step 2) placing Ni foam of a certain size and the completely dissolved solution in step 1) in a reaction kettle, and performing a hydrothermal reaction to obtain a precursor product;

[0041] Step 3) After taking out the precursor product obtained in step 2), washing and drying;

[0042] Step 4) Put the precursor product and a certain amount of sulfidation solution in the reaction kettle, and perform a secondary hydrothermal reaction to obtain the product catalyst.

[0043] Further, the hydrothermal growth condition in step 2) is 170-190°C, and the growth time is 8-12h.

[0044] Further, the seco...

Embodiment 1

[0049] NiCo 2 S 4 The preparation method of nano sheet electrocatalyst material, comprises the following steps:

[0050] (1) Put a 1cm×1.5cm nickel foam in 1M hydrochloric acid for ultrasonic cleaning for 10 minutes, take it out, rinse it with a large amount of deionized water, and then dry it in a vacuum oven at 40°C.

[0051] (2) Prepare NiCo-LDH growth solution: weigh 14.5 mg of Ni(NO 3 ) 2 ·6H 2 O, 29mg of Co(NO 3 ) 2 ·6H 2 O and 60mg of hexamethylenetetramine were mixed and dissolved in 30mL of methanol, then magnetically stirred for 30min to mix them uniformly to obtain a clear growth solution with an elemental ratio of Ni and Co of 1:2.

[0052] (3) Put the dried Ni foam into a 50 mL reactor, and pour the growth solution slowly so that the filling volume is about 80%. The reaction kettle was sealed in a stainless steel sleeve, and then placed in a blast drying oven for heat treatment. The reaction temperature was kept at 180° C., and the reaction time was 10 h. ...

Embodiment 2

[0056] Other steps are as embodiment 1, only step (2) is changed into: the Ni(NO 3 ) 2 ·6H 2 O, 58mg of Co(NO 3 ) 2 ·6H 2 O and 120 mg of hexamethylenetetramine were mixed and dissolved in 30 mL of methanol.

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Abstract

The invention discloses an electrocatalyst for efficiently decomposing water into hydrogen and oxygen and a preparation method of the electrocatalyst. With the adoption of a two-step hydrothermal method, NiCo2S4 nanosheets with different thicknesses are constructed by regulating and controlling concentration of growth-promoting media. The nanosheets with the thicknesses being 70-80 nm have good electrochemical surface area, excellent electronic transmission capacity and more reaction active sites, and show excellent performance in the reaction of decomposing water into hydrogen and oxygen with GaAs solar cells. Meanwhile, the catalyst is high in element content, low in cost and good in catalysis performance, adopts a simple preparation technology and provides basic application research for the field of direct light-to-hydrogen conversion.

Description

technical field [0001] The invention belongs to the field of electrocatalytic decomposition of water to produce hydrogen and oxygen, in particular to an electrocatalyst for efficiently decomposing water to produce hydrogen and oxygen and a preparation method thereof. Background technique [0002] With the rapid development of science and technology and the massive consumption of non-renewable energy, the energy crisis is becoming increasingly serious; hydrogen, as a renewable clean energy, is considered to be the most effective energy source to deal with energy shortages in the future; total decomposition of water to produce hydrogen is a simple Environmental protection, excellent chemical energy storage method, and effective electrocatalyst can improve the performance of hydrogen production and oxygen production in water splitting. [0003] Electrocatalysts play a crucial role in the total water splitting process and can accelerate the reaction rates of two half-reactions: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C01G53/00B01J35/10C25B1/04C25B11/06C25B11/03
CPCC25B1/04C25B11/04C01G53/006B01J27/043C25B11/031B01J35/33B01J35/60Y02E60/36
Inventor 张跃郭惠静康卓
Owner UNIV OF SCI & TECH BEIJING
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