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Array carbon nano-tube/graphene platinum-supported catalyst for fuel cell and preparation method of array carbon nano-tube/graphene platinum-supported catalyst

A carbon nanotube and fuel cell technology, applied in the field of electrochemistry, can solve problems such as shedding, large catalyst particle size, and reduced catalytic efficiency, and achieve the effects of strong electrical conductivity, large specific surface area, and increased mass transfer rate.

Active Publication Date: 2015-03-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the operation process is simple and the preparation cost is low, but the particle size of the catalyst is too large, and the catalyst is only connected to the carbon support by adsorption, and it is easy to fall off during the electrochemical reaction, thereby reducing the catalytic efficiency.

Method used

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  • Array carbon nano-tube/graphene platinum-supported catalyst for fuel cell and preparation method of array carbon nano-tube/graphene platinum-supported catalyst
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  • Array carbon nano-tube/graphene platinum-supported catalyst for fuel cell and preparation method of array carbon nano-tube/graphene platinum-supported catalyst

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Take 3g of flake graphite, add concentrated sulfuric acid and concentrated phosphoric acid respectively, and pre-oxidize for 24h; slowly add an appropriate amount of potassium permanganate 18g under ice bath conditions, and control the temperature below 20°C; then heat and react at 50°C for 12h, and wait for The reactant was cooled to room temperature, poured into 400ml of ice-deionized water, added 10ml of 30% hydrogen peroxide, first centrifugally washed with 5% HCl, and then centrifugally washed with deionized water to obtain wet graphite oxide;

[0031] (2) Take 100ml of wet graphite oxide obtained in step 1, put it into 500ml of deionized water, and continue ultrasonication for 3 hours to fully dissolve it. After ultrasonication, add 10ml of hydrazine hydrate, reflux at 90°C for 6h, cool, filter and wash the obtained product, and freeze-dry it. The obtained product is graphene (RGO);

[0032] (3) get the Graphene 0.1g that obtains in step 2 and carry out sensit...

Embodiment 2

[0036](1) Take 3g of flake graphite, add 360ml and 40ml of concentrated sulfuric acid and concentrated phosphoric acid respectively, and pre-oxidize for 24 hours; slowly add an appropriate amount of potassium permanganate 18g under ice bath conditions, and control the temperature below 20°C; then heat the reaction at 50°C After 12 hours, the reactants were cooled to room temperature, poured into 400ml ice deionized water, added 10ml 30% hydrogen peroxide, first centrifugally washed with 5% HCl, and then centrifugally washed with deionized water to obtain wet graphite oxide;

[0037] (2) Take 100ml of wet graphite oxide obtained in step 1, put it into 500ml of deionized water, and continue ultrasonication for 3 hours to fully dissolve it. After ultrasonication, add 10ml of hydrazine hydrate, reflux at 90°C for 6h, cool, filter and wash the obtained product, and freeze-dry it. The obtained product is graphene (RGO);

[0038] (3) get the Graphene 0.1g that obtains in step 2 and c...

Embodiment 3

[0042] (1) Take 3g of flake graphite, add 360ml and 40ml of concentrated sulfuric acid and concentrated phosphoric acid respectively, and pre-oxidize for 24 hours; slowly add an appropriate amount of potassium permanganate 18g under ice bath conditions, and control the temperature below 20°C; then heat the reaction at 50°C After 12 hours, the reactants were cooled to room temperature, poured into 400ml ice deionized water, added 10ml 30% hydrogen peroxide, first centrifugally washed with 5% HCl, and then centrifugally washed with deionized water to obtain wet graphite oxide;

[0043] (2) Take 100ml of wet graphite oxide obtained in step 1, put it into 500ml of deionized water, and continue ultrasonication for 3 hours to fully dissolve it. After ultrasonication, add 10ml of hydrazine hydrate, reflux at 90°C for 6h, cool, filter and wash the obtained product, and freeze-dry it. The obtained product is graphene (RGO);

[0044] (3) get the Graphene 0.1g that obtains in step 2 and ...

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Abstract

The invention provides an array carbon nano-tube / graphene platinum-supported catalyst for a fuel cell and a preparation method of the array carbon nano-tube / graphene platinum-supported catalyst, belonging to the field of electrochemistry. The catalyst comprises the following components in percentage by mass: 60-80% of array carbon nano-tube / graphene and 20-40% of platinum. The array carbon nano-tubes / graphene is used as a catalyst support, and the platinum serving as a metal component is loaded on the support. The preparation method comprises the steps of firstly, preparing a nickel / cobalt-supported graphene composite; then, growing an upright ordered carbon nano-tube on the graphene through chemical vapor deposition; and finally, reducing platinum on the support, namely the graphene-array carbon nano-tube. The support has a special structure, and the upright ordered carbon nano-tube grows on the graphene, so that the relatively large specific surface area is obtained, the utilization ratio of platinum can be increased, a smooth ion and electron channel is also provided for electro-catalytic reaction, the electro-catalytic reaction rate can be favorably increased, and finally, the catalytic efficiency of the catalyst and the utilization ratio of precious metal can be favorably increased.

Description

technical field [0001] The invention relates to an array carbon nanotube / graphene-supported platinum catalyst for a fuel cell and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] A fuel cell is an electrochemical device that directly converts chemical energy into electrical energy. One of its key materials is an electrode catalyst. For a long time, precious metals such as platinum (Pt) and ruthenium (Ru) have been widely used because of their excellent catalytic properties. use. However, due to the limited content of platinum group metals in the earth's crust, the price is high, and the rate of platinum in batteries is not high, which limits the development of fuel cells. Although the alloy catalyst can reduce the loading of Pt and improve the catalytic efficiency, the stability of the catalyst needs to be improved. Due to their unique catalytic properties, core-shell catalysts have attracted more and more attention in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCB82Y30/00H01M4/8817H01M4/8882H01M4/90H01M4/926Y02E60/50
Inventor 朱红魏伶俐孔令汉王芳辉
Owner BEIJING UNIV OF CHEM TECH
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