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Preparation method of alpha phase cobaltous hydroxide nanosheet for oxygen evolution reaction

A cobalt hydroxide and oxygen evolution reaction technology is applied in the field of preparation of graphene-like two-dimensional materials and graphene-like two-dimensional nanomaterials, which can solve the problems of low current density, high overpotential, poor stability, etc. Good, simple operation, mild reaction conditions

Inactive Publication Date: 2017-04-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to synthesize high-yield, high-quality alpha-phase cobalt hydroxide nanosheets to solve the problems of low current density, high overpotential, and poor stability in existing catalysts.

Method used

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  • Preparation method of alpha phase cobaltous hydroxide nanosheet for oxygen evolution reaction
  • Preparation method of alpha phase cobaltous hydroxide nanosheet for oxygen evolution reaction
  • Preparation method of alpha phase cobaltous hydroxide nanosheet for oxygen evolution reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Dissolve 1.6 g of cobalt chloride in 80 mL of deionized water, and 3.2 g of potassium hydroxide in 10 mL of deionized water.

[0025] (2) Transfer the solution obtained in step (1) to a glass vessel for mixing, heat and react under the condition of microwave power of 500W for 30 minutes, condense and reflux, and naturally cool to room temperature after the reaction is completed.

[0026] (3) Wash the material obtained in the previous step with deionized water and absolute ethanol successively, and then put it into a vacuum drying oven to dry to obtain alpha phase cobalt hydroxide nanosheets.

[0027] (4) Use the material synthesized in the previous step as a catalytic material for electrolysis of water (oxygen evolution reaction), and disperse the material in a mixed solution (the ratio of ethanol: deionized water is 1:1) and 5% nafion aqueous solution, in the mixed solution The ratio of mixed solution to nafion is 95:5. Apply the prepared solution on the surface o...

Embodiment 2

[0030] (1) Dissolve 2.1 g of cobalt nitrate in 60 mL of deionized water, and 3.2 g of sodium hydroxide in 40 mL of ethylene glycol.

[0031] (2) The solution obtained in step (1) was transferred to a glass vessel for mixing, heated and reacted at a microwave power of 700W for 15 minutes, condensed and refluxed, and naturally cooled to room temperature after the reaction was completed.

[0032] (3) Wash the material obtained in the previous step with deionized water and absolute ethanol successively, and then put it into a vacuum drying oven to dry to obtain alpha phase cobalt hydroxide nanosheets.

[0033] (4) Use the material synthesized in the previous step as a catalytic material for electrolysis of water (oxygen evolution reaction), and disperse the material in a mixed solution (the ratio of ethanol: deionized water is 1:1) and 5% nafion aqueous solution, in the mixed solution The ratio of mixed solution to nafion is 90:10. Apply the prepared solution on the surface of th...

Embodiment 3

[0035] (1) Dissolve 2.8 g of cobalt sulfate in 30 mL of deionized water, and 3.2 g of urea in a mixed solution of 45 mL of ethanol and 30 mL of ethylene glycol.

[0036] (2) Transfer the solution obtained in step (1) to a glass vessel for mixing, heat and react under microwave power of 600W for 180 minutes, condense and reflux, and naturally cool to room temperature after the reaction is completed.

[0037] (3) Wash the material obtained in the previous step with deionized water and absolute ethanol successively, and then put it into a vacuum drying oven to dry to obtain alpha phase cobalt hydroxide nanosheets.

[0038] (4) Use the material synthesized in the previous step as a catalytic material for electrolysis of water (oxygen evolution reaction), disperse the material in a mixed solution (the ratio of ethanol: deionized water is 1:1) and 5% nafion aqueous solution, and mix in the mixed solution The ratio of solution to nafion is 90:10. Apply the prepared solution on the s...

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Abstract

The invention discloses a preparation method of an alpha phase cobaltous hydroxide nanosheet for an oxygen evolution reaction. A cobalt source compound and an alkaline reagent are dissolved into hydrophilic solutions, reflux condensation under microwave heating is carried out after even mixing, natural cooling to the room temperature is carried out, separation is carried out after centrifugal washing, and the alpha phase cobaltous hydroxide nanosheet is obtained after vacuum drying. According to a preparation method, the microwave heating reflux condensation manner is adopted, the preparation method is simple, easy to operate, low in cost and environment-friendly, no special equipment is needed in the overall reaction process, industrial production is facilitated, and finally the obtained product is higher in quality. The alpha phase cobaltous hydroxide nanosheet prepared through the method can have the beneficial effects of being high in material electrical conductivity, many in active site, high in electrocatalytic activity and the like. The material prepared through the method is an ideal oxygen evolution reaction catalytic material with wide commercialization application prospect.

Description

technical field [0001] The invention specifically relates to the preparation of graphene-like two-dimensional materials and alpha-phase cobalt hydroxide nanomaterials, and belongs to the fields of preparation technology of graphene-like two-dimensional nanomaterials and application of electrocatalytic materials. Background technique [0002] With the increasing demand for energy, the research on water splitting reactions has attracted more and more attention. The water splitting reaction can be used as an energy storage device to convert electrical energy into chemical energy (hydrogen and oxygen) and can also be used as a power generation device combined with photosensitive materials to directly use solar energy to split water to generate energy. These two clean and efficient approaches fully meet human expectations for future energy. The water splitting reaction can be divided into two half-reactions, the oxygen evolution reaction and the hydrogen evolution reaction. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C01G51/04C25B11/06C25B1/04B82Y30/00B82Y40/00
CPCC25B1/04B82Y30/00B82Y40/00C01G51/04B01J23/75C01P2004/61C01P2004/03C01P2002/72C25B11/075B01J35/33Y02E60/36
Inventor 曹传宝乔辰朱有启
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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