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Cobalt-based oxygen generating catalyst, preparation method thereof and alkaline hydrogen-generating electrolyzer

An oxygen catalyst and cobalt-based technology, applied in the field of nanomaterials, can solve the problems of material morphology difference and low catalytic performance, and achieve the effects of excellent catalytic performance, simple method steps and good application prospects.

Active Publication Date: 2017-06-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in each work, the morphology of the materials is significantly different and the catalytic performance is low.

Method used

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  • Cobalt-based oxygen generating catalyst, preparation method thereof and alkaline hydrogen-generating electrolyzer
  • Cobalt-based oxygen generating catalyst, preparation method thereof and alkaline hydrogen-generating electrolyzer
  • Cobalt-based oxygen generating catalyst, preparation method thereof and alkaline hydrogen-generating electrolyzer

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preparation example Construction

[0039] The invention provides a method for preparing a cobalt-based oxygen-generating catalyst, comprising the following steps:

[0040] A) Preparation of CoMoO 4 Nanorod precursors;

[0041] B) the CoMoO 4 The nanorod precursor is dispersed into the solution of the anion precursor, and the anion is exchanged through a hydrothermal reaction to obtain a cobalt-based catalyst; the anion precursor is selected from metal hydroxide, metal sulfide, metal selenide or phosphate compound.

[0042] The present invention first prepares CoMoO 4 nanorod precursor, the CoMoO 4 The nanorod precursor is prepared as follows:

[0043] Mix cobalt salt, molybdate and deionized water to obtain a mixed solution;

[0044]The mixed solution is reacted under the condition of 120-180°C, followed by separation, washing and drying in order to obtain CoMoO 4 Nanorod precursors.

[0045] Specifically, cobalt salt and molybdate are added into deionized water to obtain a mixed solution. Among them, t...

Embodiment 1

[0063] (1)CoMoO 4 Preparation of nanorod precursors:

[0064] 2mmol Co(NO 3 ) 2 ·6H 2 O and 2 mmol Na 2 MoO 4 2H 2 O was respectively dissolved in 17.5ml deionized water, and stirred to fully dissolve; the above-mentioned Na 2 MoO 4 solution was added to Co(NO 3 ) 2 solution, stirred for 10 minutes to form a uniform mixed solution; transferred the mixed solution to a 50ml reaction kettle, put it in a 150°C oven, and reacted for 6 hours; took out the reaction kettle, observed a large number of purple precipitates, centrifuged and washed twice with distilled water , washed once with ethanol, and dried in a vacuum oven at 60°C for 12 hours to obtain CoMoO 4 Nanorod precursors.

[0065] For the above CoMoO 4 The nanorod precursor was observed by transmission electron microscopy, and the results are shown in figure 1 , figure 1 For the CoMoO that embodiment 1 obtains 4 Transmission electron micrographs of nanorod precursors. From figure 1 It can be seen that CoMoO ...

Embodiment 2

[0070] According to the preparation method of Example 1, the preparation of the cobalt-based oxygen-generating catalyst has the following differences: when preparing the anion precursor solution, 20 mL of water is selected as the reaction solvent to obtain Co(OH) 2 Material.

[0071] The obtained material is subjected to scanning electron microscope analysis, and the results can be found in Figure 4 , Figure 4 Co(OH) obtained for Example 2 2 Scanning electron micrographs of the material. With the Co(OH) that embodiment 1 obtains 2 Material is compared, the Co(OH) that present embodiment 2 obtains 2 There is no obvious difference in the morphology of the material, and it is still a one-dimensional structure composed of nanosheets, with a diameter of about 300-400nm, composed of Co(OH) 2 The size of the nano sheet on the surface of the material is 50-100nm.

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Abstract

The invention provides a preparation method of a cobalt-based oxygen generating catalyst. The preparation method includes following steps: A), preparing a CoMoO4 nanorod precursor; B), dispersing the CoMoO4 nanorod precursor in a solution of an anion precursor, and performing anion exchange through hydrothermal reaction to obtain the cobalt-based catalyst, wherein the anion precursor is chosen from metal hydroxide, metal sulfide, metal selenide or phosphate compound. The cobalt-based oxygen generating catalyst uniform in morphology can be obtained by subjecting the CoMoO4 nanorod precursor and the anion precursor, so that the preparation method has simple steps and is simple and easy to perform and has the advantages of good convenience and quickness. The catalyst has excellent catalytic performance and has good application prospect in the field of electrochemical complete solution water hydrogen generation.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a cobalt-based oxygen-generating catalyst, a preparation method thereof, and an alkaline hydrogen-producing electrolytic cell. Background technique [0002] Due to the advantages of high energy density and almost zero carbon emissions, hydrogen-oxygen fuel cells have become a research hotspot in the energy field. The development of practical hydrogen-oxygen fuel cells is of great significance to the energy and environmental issues in today's world. Reducing the economic and environmental costs of hydrogen production is a key link in the development and promotion of hydrogen-oxygen fuel cells. A more environmentally friendly method for preparing hydrogen is electrolysis of water to produce hydrogen. The hydrogen production reaction of electrolysis of water is divided into oxygen evolution reaction at the anode and hydrogen evolution reaction at the cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/043B01J27/057B01J27/185B01J35/02C25B11/06C25B1/10
CPCC25B11/04B01J23/75B01J27/043B01J27/0573B01J27/1853C25B1/04C25B9/73B01J35/40Y02E60/36
Inventor 俞书宏余自友郎超超
Owner UNIV OF SCI & TECH OF CHINA
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