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Method for preparing three-dimensional curved surface flower-like cobalt hydroxide with high electro-catalytic activity

A catalytic activity, three-dimensional curved surface technology, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of unsuitable for mass production, complex reaction process, uneconomical and reasonable, and achieve excellent electrocatalytic oxygen evolution activity.

Inactive Publication Date: 2019-01-04
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction process is complicated and consumes a lot of energy, and some reactions even involve templates, which is neither economical nor suitable for mass production

Method used

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  • Method for preparing three-dimensional curved surface flower-like cobalt hydroxide with high electro-catalytic activity
  • Method for preparing three-dimensional curved surface flower-like cobalt hydroxide with high electro-catalytic activity
  • Method for preparing three-dimensional curved surface flower-like cobalt hydroxide with high electro-catalytic activity

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preparation example Construction

[0017] A method for preparing a three-dimensional curved flower-shaped cobalt hydroxide with high electrocatalytic activity of the present invention, specifically comprising the following process:

[0018] Step 1, weigh 1mmol ~ 1mol of CoSO 4 ·7H 2 O (as a Co source) was dissolved in deionized water (50-200ml), and after complete dissolution, solution A was obtained;

[0019] Step 2, add 0.5mmol~2mol of hydrazine hydrate (N 2 h 4 ·H 2 O), wherein hydrazine hydrate is used as a morphology regulator, and hydrolyzed to provide an alkaline environment, stirred at 25 ° C for 1 to 10 h, after stirring, left to stand and centrifuged, washed with deionized water for 3 to 6 times, at 60 to 80 Dry at ℃ for 12-24 hours to obtain.

Embodiment 1

[0021] Weigh CoSO according to the molar ratio of 0.5mol:0.5mmol 4 ·7H 2 O and N 2 h 4 ·H 2 O, the CoSO 4 ·7H 2 O was dissolved in 50ml deionized water, and after complete dissolution, solution A was obtained, and the measured N 2 h 4 ·H 2 O was slowly added dropwise into solution A, stirred at room temperature (25°C) for 1 h, after stirring, left to centrifuge, washed with deionized water 4 times, and dried at 60°C for 12 h.

Embodiment 2

[0023] Weigh CoSO according to the molar ratio of 1.0mmol:1.0mmol 4 ·7H 2 O and N 2 h 4 ·H 2 O, the CoSO 4 ·7H 2 O was dissolved in 60ml deionized water, and after complete dissolution, solution A was obtained, and the measured N 2 h 4 ·H 2 O was slowly added dropwise into solution A, stirred at room temperature (25°C) for 10 h, after stirring, left to centrifuge, washed with deionized water three times, and dried at 80°C for 24 h.

[0024] The material obtained according to the preparation method of Example 2 has a three-dimensional flower-like structure, such as figure 1 and figure 2 As shown, each aggregate is assembled from curved sheets by image 3 , the XRD results show that the prepared material is α-Co(OH) 2 . Such as Figure 4 As shown, the product has excellent electrocatalytic oxygen evolution activity and has a good application prospect.

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Abstract

The invention discloses a method for preparing three-dimensional curved surface flower-like cobalt hydroxide with high electro-catalytic activity. The method particularly includes steps of 1, dissolving 1 mmol-1 mol of CoSO4 7H2O in deionized water and completely dissolving the CoSO4 7H2O to obtain solution A; 2, adding 0.5 mmol-2 mol of hydrazine hydrate N2H4 H2O into the solution A obtained at the step 1, stirring the hydrazine hydrate and the solution A at the room temperature for 1-10 h to obtain mixtures, allowing the mixtures to stand still, centrifuging the mixtures, centrifugally washing the mixtures by deionized water by 3-6 times and drying the mixtures to obtain the three-dimensional curved surface flower-like cobalt hydroxide. The CoSO4 7H2O is used as a Co source. The method has the advantages that the shortcoming of technological requirements of the traditional preparation methods on high temperatures, heating and template agents can be overcome by the aid of the method;the preparation cost and the requirements on equipment can be lowered to a great extent, and mass production can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of preparation of cobalt hydroxide, and in particular relates to a preparation method of three-dimensional curved flower-shaped cobalt hydroxide with high electrocatalytic activity. Background technique [0002] Hydrogen energy is considered to be one of the most promising clean energy sources in the 21st century. Hydrogen production by electrolysis of water has attracted widespread attention because of its simple process and high purity of hydrogen. However, hydrogen production by electrolysis of water includes two half-reactions of hydrogen evolution reaction and oxygen evolution reaction, in which the oxygen evolution reaction involves a four-electron transfer process, which seriously affects the overall reaction rate of the entire reaction. Moreover, in many energy converters, such as : Oxygen evolution reaction is involved in metal-air batteries and renewable fuel cells. Therefore, the development of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 王媛严珂李智敏黄云霞闫养希
Owner XIDIAN UNIV