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Graphene-based composite air electrode catalyst and preparation method thereof

A graphene-based, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of simple operation, easy commercialization, and easy industrial production

Inactive Publication Date: 2011-11-23
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports of graphene and cobalt hydroxide composites as catalysts for the oxygen reduction reaction.

Method used

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  • Graphene-based composite air electrode catalyst and preparation method thereof
  • Graphene-based composite air electrode catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 1g of graphite powder and 1g of sodium nitrate to 46mL of concentrated sulfuric acid, and stir in an ice bath for 4h. Then slowly add 6 g of potassium permanganate under stirring (ensure that the temperature is maintained below 10° C.). Then it was transferred to a water bath at 35°C and stirred for 2 hours, then 92 mL of ultrapure water was added, and the temperature was adjusted to 98°C and stirred for 2 hours in a water bath. At this time, the solution was bright yellow. Finally, 200 mL of warm water and 20 mL of 30% hydrogen peroxide were added, stirred for 1 h, and the solution turned brown at this time.

[0034] The obtained colloidal solution was centrifuged, then washed once with a hydrochloric acid solution with a mass concentration of 15%, washed three times with ultrapure water, and finally washed once with absolute ethanol to obtain a paste of graphite oxide. After the paste was dried at 60°C, it was ground with a mortar to obtain powdered graphite oxid...

Embodiment 2

[0038] Add 1g of graphite powder and 1g of sodium nitrate to 23mL of concentrated sulfuric acid, and stir in an ice bath for 4h. Then slowly add 3 g of potassium permanganate under stirring (make sure the temperature is maintained below 10° C.). Then it was transferred to a water bath at 30°C and stirred for 3 hours, then 92 mL of ultrapure water was added, and the temperature was adjusted to 95°C and stirred for 3 hours in a water bath. At this time, the solution was bright yellow. Finally, 300 mL of warm water and 30 mL of 30% hydrogen peroxide were added, stirred for 1 h, and the solution turned brown at this time.

[0039] The obtained colloidal solution is centrifuged, then washed once with hydrochloric acid solution with a mass concentration of 25%, washed three times with ultrapure water, and finally washed once with absolute ethanol to obtain a paste of graphite oxide. After the paste was dried at 70°C, it was ground with a mortar to obtain powdered graphite oxide. D...

Embodiment 3

[0042] Add 1g of graphite powder and 1g of sodium nitrate to 23mL of concentrated sulfuric acid, and stir in an ice bath for 4h. Then slowly add 6 g of potassium permanganate under stirring (ensure that the temperature is maintained below 10° C.). Then it was transferred to a water bath at 40°C and stirred for 1.5 hours, then 100 mL of ultrapure water was added, and the temperature was adjusted to 93°C for 4 hours. At this time, the solution was bright yellow. Finally, 150 mL of warm water and 25 mL of 60% hydrogen peroxide were added, stirred for 1 h, and the solution turned brown at this time.

[0043] The obtained colloidal solution is centrifuged, then washed once with hydrochloric acid solution with a mass concentration of 20%, washed three times with ultrapure water, and finally washed once with absolute ethanol to obtain a paste of graphite oxide. After the paste was dried at 55°C, it was ground with a mortar to obtain powdered graphite oxide. Dissolve graphite oxide ...

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Abstract

The invention relates to an oxygen reduction reaction catalyst with graphene as a carrier, and a preparation method thereof. The invention provides a graphene-based composite oxygen reduction reaction catalyst and a preparation method thereof. The catalyst comprises graphene and cobalt hydroxide, and the loading amount of cobalt hydroxide is 3.2-15 microgram / cm2. The preparation method of the graphene-based composite oxygen reduction reaction catalyst comprises: depositing a cobalt hydroxide precipitate on a surface of a graphene membrane by a potentiostatic deposition method so as to obtain the graphene-based composite oxygen reduction reaction catalyst.

Description

technical field [0001] The invention relates to an oxygen reduction reaction catalyst with graphene as a carrier and a preparation method thereof. Background technique [0002] The widespread application of air electrodes in energy conversion systems such as fuel cells and metal-air batteries has drawn attention to the cathodic reaction of oxygen reduction. Since the oxygen reduction reaction is a kinetically slow process, the development of high-performance catalysts has always been a hot spot in this field. Platinum (Pt)-based materials are considered to be the most active and efficient oxygen reduction reaction catalysts, but their high cost and scarce resources limit their commercial applications. Therefore, the development of high-performance non-Pt oxygen reduction reaction catalysts has important application value. [0003] Since the discovery of graphene by the Geim research group in 2004, the preparation and application of graphene have attracted much attention. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/75B01J37/34
CPCY02E60/50
Inventor 吴佳佳张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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