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Flower ball-shaped nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof

A technology of cobalt oxides and catalysts, which is applied in the flower-shaped nickel/cobalt oxide oxygen evolution catalyst and its preparation and application fields. The effect of uniformity, good dispersion and simple process

Inactive Publication Date: 2017-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst has good electrocatalytic activity for oxygen evolution under alkaline conditions, the catalyst still has its insurmountable shortcomings
The supported catalyst with carbon material as the carrier is severely corroded under the electrolysis voltage of the alkaline full electrolytic cell test, which affects the long-term operation life of the full electrolytic cell

Method used

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  • Flower ball-shaped nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof
  • Flower ball-shaped nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof
  • Flower ball-shaped nickel/cobalt oxide oxygen evolution catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] preparation:

[0038] (1) Mixing of precursor solution: Take 30mL of n-hexane in a 50mL beaker; add 1.5g of dodecyltrimethylammonium bromide (CTAB) to the mixed solution under vigorous stirring, and stir for 15min; After the alkyltrimethylammonium bromide was dissolved, 2 mL of 0.5M aqueous urea solution was added dropwise to the solution, and the stirring was continued for 10 min until a transparent solution was obtained. Quantitatively take 0.5M CoSO 4 solution and 0.5M NiSO 4 solution, mix the two evenly, add dropwise to the transparent solution obtained before, and stir vigorously for 30 minutes;

[0039] (2) Hydrothermal reaction: transfer the solution of (1) to a 50mL hydrothermal reaction kettle, and conduct a hydrothermal reaction at 150°C in a blast drying oven for 10 hours, and the hydrothermal kettle is cooled with the furnace to prepare nickel-cobalt hydroxide . Wash by centrifugation for 3 to 5 times, and dry in vacuum for 8 hours.

[0040] (3) Roasting:...

Embodiment 2

[0043] Find through BET test, the specific surface area of ​​the spherical nickel-cobalt oxide prepared in example 1 reaches 110m 2 / g.

Embodiment 3

[0045] Take the same preparation process as in Example 1, change the precursor solution to 0.1M CoSO 4 solution and 0.9M NiSO 4 The half-cell test procedure adopted by the solution is as described in Example 1, and the relevant test results are as follows Figure 4 shown. The Ni prepared by this method 7 co 3 (OH)x 10mA / cm in 1M KOH electrolyte solution 2 The potential at the electrolysis current density is 1.612V (vs.RHE).

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Abstract

The invention relates to a flower ball-shaped nickel / cobalt oxide oxygen evolution catalyst, and a preparation method and application thereof. Concretely, nickel salt and cobalt salt are used as precursors; proper surfactants (such as DTAB (dodecyl trimethyl ammonium bromide) and CTAB (cetyltrimethyl ammonium bromide)) are added; the materials are dissolved into a small molecule organic solvent; under the participation of a coordination agent, the hydrothermal reaction is performed; the nickel / cobalt hydroxide nanometer material is prepared; through the steps of centrifugation washing, drying, roasting and the like, the nickel / cobalt oxide flower balls with the diameter being about 5mum are prepared. The nickel / cobalt oxides are applied to the oxygen evolution reaction in the water electrolysis hydrogen preparation process under the catalysis basic condition. The nickel / cobalt oxide obtained through preparation has large specific surface area; the appearance is controllable; the preparation process is simple; the conditions are mild; under the additional bias pressure, the method can be used for electrolysis pool water decomposition hydrogen preparation. The prepared nickel / cobalt oxide has good performance when being used as an alkaline solid polymer electrolyte (AEM) water electrolysis pool. The flower ball-shaped nickel / cobalt oxide oxygen evolution catalyst has wide application values in RFC (regenerative fuel cells), photoelectrocatalysis and electrolysis hydrogen generator devices.

Description

technical field [0001] The invention relates to a preparation method of a nickel-cobalt oxide oxygen evolution catalyst for alkaline electrolysis of water. The method is prepared through the steps of precursor mixing-hydrothermal reaction-centrifugal washing-vacuum drying-roasting and the like to obtain a diameter of 5-10 μm Around the nickel / cobalt hydroxide curd. The final product, as an oxygen evolution electrocatalyst used under alkaline conditions, can be applied to AEM water electrolysis, RFC or various electrolysis devices. Background technique [0002] Water electrolysis offers a clean conversion route from water to hydrogen. If renewable energy is used to produce electricity for electrolysis of water, CO2 can be truly realized. 2 zero emissions. The purity of hydrogen obtained in this way is very high, which can reach more than 99.9%. It is an ideal source of raw gas for the manufacturing industry of precision electronic devices that requires high-purity hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C25B11/06C25B1/04
CPCY02E60/36Y02P20/584
Inventor 俞红梅迟军付丽贾佳覃博文邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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