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Preparation method of dodecahedral hollow cobalt-nickel selenide/iron oxyhydroxide composite catalyst

A technology of iron oxyhydroxide and composite catalyst, which is applied in the directions of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor conductivity of iron oxyhydroxide alone, and achieves environmental protection, pollution-free and improved preparation cycle. Oxygen evolution reaction ability and stability, and the effect of improving OER performance

Pending Publication Date: 2020-12-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron oxyhydroxide alone is poorly conductive, but its strong adsorption properties for oxygen-containing intermediates make it an ideal compensator for nickel / cobalt-based composites

Method used

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  • Preparation method of dodecahedral hollow cobalt-nickel selenide/iron oxyhydroxide composite catalyst
  • Preparation method of dodecahedral hollow cobalt-nickel selenide/iron oxyhydroxide composite catalyst
  • Preparation method of dodecahedral hollow cobalt-nickel selenide/iron oxyhydroxide composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A preparation method of a cobalt-nickel-based catalyst material is realized in the following steps:

[0060] (1) Preparation of cobalt-based metal-organic framework materials: 1.74g of cobalt nitrate hexahydrate and 1.97g of dimethylimidazole were dissolved in 150ml of anhydrous methanol; 1200r / min, finally centrifuged and washed 3 times with deionized water and absolute ethanol, and dried in vacuum at 70°C for 10h to obtain a cobalt-based metal-organic framework material;

[0061] (2) Preparation of cobalt-nickel layered double metal hydroxide material: Weigh 40mg of cobalt-based metal-organic framework material and ultrasonically disperse it in 50mL of absolute ethanol, then quickly add 100mg of nickel nitrate hexahydrate and stir at room temperature for 4h, Centrifuge and wash with absolute ethanol, and finally dry in vacuum at 70°C for 10 hours to obtain a cobalt-nickel layered double hydroxide material;

[0062] (3) Cobalt-nickel layered double hydroxide selenizat...

Embodiment 2

[0065] The difference between this example and Example 1 is that 25 mg of ferrous sulfate heptahydrate was added to the solution and stirred, and other parameters and specific implementation steps were the same as in Example 1.

Embodiment 3

[0067] The difference between this example and Example 1 is that 35 mg of ferrous sulfate heptahydrate was added to the solution and stirred, and other parameters and specific implementation steps were the same as in Example 1.

[0068] figure 1 For the preparation of (Co,Ni)Se 2 / C@FeOOH) flow chart.

[0069] The above steps 1 to 4 can be prepared to obtain (Co, Ni)Se 2 / C@FeOOH). As a comparison, step 4 is not carried out, and only steps 1 to 3 are carried out to obtain (Co,Ni)Se 2 / C. Only carry out steps 1 to 2 to obtain CoNiLDH. Only carry out step 1, ZIF-67 can be obtained.

[0070] figure 2 (Co, Ni)Se prepared for Example 2 2 / C@FeOOH), (Co,Ni)Se 2 / C, CoNi LDH, the XRD pattern of ZIF-67, as can be seen from the figure that (Co, Ni)Se prepared by the present invention 2 / C@FeOOH), (Co,Ni)Se 2 / C, CoNiLDH, and ZIF-67 are all pure phases, and (Co,Ni)Se 2 / C@FeOOH), (Co,Ni)Se 2 / C has the same diffraction peaks at different 2θ angles, which indicates that the...

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Abstract

The invention discloses a preparation method of a dodecahedral hollow cobalt-nickel selenide / iron oxyhydroxide composite catalyst, and can solve the problems of high price, poor stability and the likeof noble metal electrode materials. The preparation method comprises the following steps: mixing cobalt nitrate hexahydrate, dimethylimidazole and methanol, and conducting stirring at room temperature to obtain ZIF-67; mixing the obtained material, nickel nitrate hexahydrate and ethanol, and conducting stirring at room temperature to obtain CoNi-LDH; carrying out selenylation treatment on the obtained material and selenium powder by adopting a chemical vapor deposition method to obtain (Co,Ni)Se2 / C; and subjecting the obtained selenide and ferrous sulfate heptahydrate to a chemical water bathdeposition method, so as to obtain (Co,Ni)Se2 / C-coated FeOOH. According to the invention, the cobalt-nickel-based selenide / iron oxyhydroxide composite material with the hollow cage-shaped nano structure is prepared by a simple and convenient chemical water bath deposition method, and the material shows excellent electrochemical properties such as relatively low overpotential, good stability and the like in an oxygen evolution reaction.

Description

technical field [0001] The invention relates to the fields of new energy materials and electrochemical energy storage, in particular to a dodecahedral hollow cobalt nickel selenide / iron oxyhydroxide composite catalyst and a preparation method thereof. Background technique [0002] In response to the world energy crisis and climate change, hydrogen production by electrolysis of water is considered to be an effective strategy to develop clean and sustainable new energy, and the field of hydrogen production has received more and more attention from all over the world. Generally speaking, the process of water electrolysis is divided into the hydrogen evolution reaction (Hydrogen Evolution Reaction, HER) that occurs at the cathode and the oxygen evolution reaction (OER) that occurs at the anode. Due to the four-electron process of the oxygen evolution reaction, the oxygen evolution reaction at the anode The kinetics are generally slow and require an overpotential several times hi...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/00B01J35/02B01J37/03B01J37/08B01J37/30C25B1/04C25B11/06
CPCB01J27/0573B01J37/30B01J37/086B01J37/031C25B1/04B01J35/33B01J35/00B01J35/30Y02E60/36
Inventor 王春栋谷雨洪果
Owner HUAZHONG UNIV OF SCI & TECH
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