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Application of manganese oxide/graphene catalyst

A technology of graphene and manganese oxide, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problems of characterization of the catalytic performance of oxygen reduction reaction, and achieve easy Commercial promotion, good catalytic stability, and simple operation

Inactive Publication Date: 2013-08-14
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZL201110135866.X prepared a composite material of graphene and manganese oxide by reacting graphene with potassium permanganate, but did not characterize its catalytic performance for oxygen reduction reaction
At the same time, there is no report on the preparation of graphene and manganese oxide composites as air electrode catalysts by physical methods.

Method used

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  • Application of manganese oxide/graphene catalyst
  • Application of manganese oxide/graphene catalyst
  • Application of manganese oxide/graphene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of manganese oxide / graphene catalyst: First, a layer of graphene film is modified on the surface of the working electrode by physical modification method, and then the colloidal solution of manganese oxide prepared by hydrothermal synthesis method is drip-coated on the surface of graphene film to obtain manganese oxide / Graphene Oxygen Reduction Reaction Catalyst.

[0028] The specific steps are,

[0029] 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, s...

Embodiment 2

[0038] The difference from Example 1 is:

[0039] The concrete steps of preparing manganese oxide / graphene oxygen reduction reaction catalyst are,

[0040] 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.

[0041] 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 abso...

Embodiment 3

[0048] The difference with embodiment 1 and 2 is:

[0049] The concrete steps of preparing manganese oxide / graphene oxygen reduction reaction catalyst are,

[0050] 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.

[0051] 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 t...

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Abstract

The invention relates to an electrode catalyst, specifically to an application of manganese oxide / graphene catalyst. The manganese oxide / graphene catalyst is used in an air electrode. According to the catalyst, graphene and manganese oxide are respectively prepared by chemical reduction of graphite oxide and hydro-thermal synthesis, and modification of manganese oxide on the surface of a graphene film is realized by a physical dispensing method so as to obtain the manganese oxide / graphene air electrode catalyst. The prepared catalyst has excellent catalytic performance. By the adoption of the catalyst, overpotential of an oxygen reduction reaction can be reduced and reaction current can be increased.

Description

technical field [0001] The invention relates to an electrode catalyst, in particular to the application of a manganese oxide / graphene catalyst. Background technique [0002] Air electrodes play an important role in energy conversion systems (such as fuel cells and metal-air batteries), and the reaction on them is oxygen reduction reaction. Oxygen reduction reaction has the characteristics of complicated process and slow kinetics, which reduces the efficiency of energy conversion system. Therefore, the development of high-performance catalysts that can enable the four-electron reduction of oxygen to occur at a lower overpotential is of great significance. Platinum (Pt)-based materials are currently the most studied catalysts for oxygen reduction reactions, but their high cost and scarce resources limit their commercial application. [0003] The catalytic effect of manganese oxide on the oxygen reduction reaction has been known for a long time. The advantage of low cost has...

Claims

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Application Information

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