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Oxygen reduction catalyst for fuel cell, and preparation method thereof

A fuel cell and catalyst technology, applied in the field of fuel cell oxygen reduction catalyst and its preparation, to achieve good resistance to methanol and carbon monoxide, process safety, and mild reaction conditions

Active Publication Date: 2012-04-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching, there is no report on the preparation of oxygen reduction electrode catalysts supported by graphene supported transition metal oxides.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Graphite oxide was prepared by the Hummers method. In an ice bath, mix 10 grams of graphite powder and 5 grams of sodium nitrate with 230 milliliters of 98% concentrated sulfuric acid, and slowly add 30 grams of potassium permanganate while stirring. It was moved to a 35°C water bath for 30 minutes, and 460 ml of deionized water was added gradually. The temperature was raised to 98°C and the reaction was continued for 40 minutes. The mixture turned from brown to bright yellow. Further dilute with water, and treat with 30% hydrogen peroxide solution to neutralize unreacted permanganic acid, centrifugally filter and repeatedly wash the filter cake, and vacuum dry to obtain graphite oxide (the same below). Then 150 milligrams of graphite oxide and 600 milligrams of copper acetate were dissolved in 100 milliliters of absolute ethanol, and after ultrasonic (power 150W) stirring for 6 hours, they were placed in an oven and dried to obtain a copper acetate-graphite oxide compo...

Embodiment 2

[0024] Graphite oxide was prepared by the Hummers method. Then 100 milligrams of graphite oxide and 500 milligrams of cobalt nitrate were dissolved in 200 milliliters of absolute ethanol, and after ultrasonic (power 150W) stirring for 4 hours, they were placed in an oven and dried to obtain a cobalt nitrate-graphite oxide composite; Ultrasound (power 150W) was dispersed in 80 ml of isopropanol, heated under magnetic stirring, added 5 ml of water at 90°C, continued to heat up to 130°C and reacted at this temperature for 4 hours; after the system was naturally cooled to room temperature, centrifuged , and washed with absolute ethanol until there is no reaction medium, dried, and the obtained solid graphene-supported cobalt tetraoxide composite material is an oxygen reduction catalyst for fuel cells, wherein transition metal oxide: graphene=69:50 (mass ratio), loaded on graphite The particle size of cobalt tetraoxide on the olefin sheet is 20nm.

[0025] The graphene-loaded tric...

Embodiment 3

[0028] Graphite oxide was prepared by the Hummers method. Then 30 milligrams of graphite oxide and 300 milligrams of iron acetate were dissolved in 40 milliliters of absolute ethanol, and after ultrasonic (power 150W) stirring for 1 hour, they were placed in an oven and dried to obtain iron acetate-graphite oxide composite; Ultrasound (power 150W) was dispersed in 50 ml of ethylene glycol, heated under magnetic stirring, added 1 ml of water at 70°C, continued to heat up to 200°C and reacted at this temperature for 2 hours; after the system was naturally cooled to room temperature, centrifuged , and washed with absolute ethanol until there is no reaction medium, dried, and the obtained solid graphene-supported iron oxide composite material is an oxygen reduction catalyst for fuel cells, wherein transition metal oxide: graphene=69:50 (mass ratio), loaded on The particle size of the iron oxide on the graphene sheet is 300nm.

[0029] The fuel cell oxygen reduction catalyst graph...

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Abstract

The invention relates to an oxygen reduction catalyst for a fuel cell, and a preparation method thereof. The oxygen reduction catalyst comprises a transition metal oxide and graphene, wherein a ratio of the transition metal oxide to the graphene is 1-100:1-50, the particle size of the transition metal oxide loaded on the graphene is 0.1-600 nm. The catalyst and the preparation method of the present invention have the following advantages that: with the method, the preparation time is shortened, the cost is low, the reaction conditions are mild, the process is safe, and the catalyst has advantages of good methanol resistance and good carbon monoxide resistance.

Description

technical field [0001] The invention belongs to a catalyst and a preparation method thereof, in particular to an oxygen reduction catalyst for a fuel cell and a preparation method thereof. Background technique [0002] Fuel cell is a green energy device that can convert chemical energy into electrical energy without burning. Because of its high energy density, environmental friendliness, pollution-free and high specific power, it has become a research hotspot all over the world. In the fuel cell system, the commonly used oxygen reduction catalyst is the noble metal Pt, which has high catalytic activity and good stability, and is a high-efficiency oxygen reduction catalyst. However, the commercial development of fuel cells is limited due to the high price. Therefore, the development of low-cost, high-efficiency non-precious metal oxygen reduction catalysts has become a top priority for fuel cells. [0003] Among the non-noble metal oxygen reduction catalyst systems, the rese...

Claims

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Application Information

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IPC IPC(8): B01J23/72B01J23/75B01J23/745B01J23/06B01J23/755B01J23/14B01J23/34H01M4/90
CPCY02E60/50
Inventor 郭向云闫晓燕靳国强童希立王英勇杨鹏
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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