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Multistage hole structure transition metaloxygen reduction catalyst and preparation method thereof

A technology of transition metals and transition metal salts, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as low activity, high cost, and unrealistic catalyst design, achieve large specific surface area, reduce production costs, and promote business The effect of the application

Inactive Publication Date: 2019-05-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve technical problems such as high cost, low activity, and unrealistic catalyst design in the production of fuel cells. Based on the actual situation of alkaline fuel cells, a transition metal oxygen reduction catalyst with a multi-level porous structure is proposed. Its preparation method uses cheap chemicals as raw materials, and prepares an oxygen reduction catalyst with rich micropores, mesopores and macropores, good electrical conductivity and high activity through static growth and high-temperature carbonization. The catalytic activity is controllable, easy to scale up, and it is applied in the preparation process of the membrane electrode of the alkaline fuel cell to reduce the production cost of the fuel cell, so it has important practical application significance and economic benefits

Method used

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  • Multistage hole structure transition metaloxygen reduction catalyst and preparation method thereof
  • Multistage hole structure transition metaloxygen reduction catalyst and preparation method thereof
  • Multistage hole structure transition metaloxygen reduction catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Disperse 500 mg of commercial carbon black, 1.5 g of cobalt nitrate hexahydrate and 500 mg of polyvinylpyrrolidone in 40 mL of methanol, and ultrasonically disperse the carbon black, cobalt nitrate and polyvinylpyrrolidone for 15 minutes to obtain a black suspension (mixture A) ;

[0039](2) Disperse 2 g of 2-methylimidazole in another portion of 40 mL of methanol, and ultrasonicate for 5 min to obtain a clear and transparent solution (mixture B);

[0040] (3) Place mixture A in an environment of 0°C, and magnetically stir at a speed of 600 rpm for 30 minutes; then quickly pour mixture B into mixture A, and continue stirring for 40 minutes in an environment of 0°C;

[0041] (4) Stop stirring after 40 minutes, take out the magnet, and let it stand at room temperature for 72 hours after sealing;

[0042] (5) Centrifuge the sample after standing, and wash the obtained solid twice with ultrapure water. Finally, centrifuge and take out the solid, which is the precursor ...

Embodiment 2

[0063] (1) 500mg graphene, 1.5g ferrous sulfate heptahydrate and 500mg polyvinylpyrrolidone are dispersed in 20mL ethanol, ultrasonic 15min, graphene, ferrous sulfate heptahydrate and polyvinylpyrrolidone are dispersed evenly, obtain black suspension ( mixture A);

[0064] (2) Disperse 2g of 2-methylimidazole in another portion of 20mL of ethanol, and sonicate for 5min to obtain a clear and transparent solution (mixture B);

[0065] (3) Place mixture A in a -5°C environment, and magnetically stir at a speed of 600rpm for 30 minutes; then quickly pour mixture B into mixture A, and continue stirring in a -5°C environment for 10 minutes;

[0066] (4) Stop stirring after 10 minutes, take out the magnet, and let it stand at room temperature for 24 hours after sealing;

[0067] (5) Centrifuge the sample after standing, and wash the obtained solid twice with ultrapure water. Finally, centrifuge and take out the solid, which is the precursor of the catalyst, and place it in a blast d...

Embodiment 3

[0074] (1) Disperse 500 mg of carbon nanotubes, 1.5 g of zinc nitrate hexahydrate and 500 mg of polyvinylpyrrolidone in 100 mL of ethanol, and ultrasonically disperse the carbon nanotubes, zinc nitrate hexahydrate and polyvinylpyrrolidone for 15 minutes to obtain a black suspension ( mixture A);

[0075] (2) Disperse 2 g of 2-methylimidazole in another portion of 100 mL of ethanol, and ultrasonicate for 5 min to obtain a clear and transparent solution (mixture B);

[0076] (3) Place mixture A in an environment of 5°C, and perform magnetic stirring at a speed of 600 rpm for 30 minutes; then quickly pour mixture B into mixture A, and continue stirring in an environment of 5°C for 60 minutes;

[0077] (4) Stop stirring after 60 minutes, take out the magnet, and let it stand at room temperature for 48 hours after sealing;

[0078] (5) Centrifuge the sample after standing, and wash the obtained solid twice with ultrapure water. Finally, centrifuge and take out the solid, which is ...

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Abstract

The invention belongs to the technical field of inorganic advanced nanomaterials, and discloses a multistage hole structure transition metal oxygen reduction catalyst and a preparation method thereof.Powder-like carbon materials are taken as carriers, and the zeolite imidazole organic framework is grown in-situ on the surfaces of the powder-like carbon materials as a pre-driving body of the catalyst; a non-noble metal oxygen reduction catalyst with rich Co and N elements and the multistage hole structure is prepared; the temperature of pre-driving body thermal cracking is adjusted and controlled, thus the distribution of different elements and the bore diameter of the different elements in the catalyst can be adjusted, and thus oxygen reduction catalytic activity of the catalyst is controlled. According to the multistage hole structure transition metal oxygen reduction catalyst and the preparation method thereof, the catalytic performance is approach to commercial Pt / C (the content ofthe Pt is 60) catalyst, and the multistage hole structure transition metal oxygen reduction catalyst and the preparation method have the characteristics of cheapness and high-efficiency; the introduction of carbon black lowers the particle size of the catalyst, thus more active sites expose to the surface to participate reaction, meanwhile the interactive conveying process of the electron and gas-liquid is optimized, and thus the excellent performance and application prospects are displayed in the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of inorganic advanced nanometer materials, and specifically relates to a fuel cell transition metal nano-oxygen reduction catalyst and a preparation method thereof. Background technique [0002] Hydrogen energy is considered to be an ideal energy source for human beings in the 21st century, and a fuel cell is a high-efficiency energy conversion device that converts hydrogen energy into electrical energy. Therefore, the development of fuel cell technology is of great significance to the sustainable development of energy and the construction of a hydrogen energy society. However, the cost of traditional noble metal catalysts limits the further development of fuel cells. In order to reduce the production cost of fuel cells and promote the commercial application of fuel cells, the development of non-precious metal oxygen reduction catalysts has become the focus of researchers. However, most of the current rese...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 张俊锋尹燕祝伟康秦彦周
Owner TIANJIN UNIV