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Preparation method of Pt-based catalyst for fuel cell

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process, limited practical application, high energy consumption, etc., and achieves simple and easy method, convenient for large-scale production, high specific surface area Effect

Inactive Publication Date: 2019-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a variety of 3D graphene composites have been synthesized, their use as supports for fuel cell oxygen reduction catalysts has rarely been reported
In addition, the complex preparation process, high energy consumption, and high cost also limit the practical application of these 3D graphene composites.

Method used

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  • Preparation method of Pt-based catalyst for fuel cell
  • Preparation method of Pt-based catalyst for fuel cell
  • Preparation method of Pt-based catalyst for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Ultrasonic dispersion of carbon black in deionized water, adding cationic polymer PDDA, so that the mass ratio of carbon black to PDDA is 1:10. After ultrasonic stirring for 3 hours, wash and filter with deionized water to obtain positively charged functionalized carbon black (FCB);

[0032] 2) Redisperse the above-mentioned functionalized carbon black into deionized water, add a water dispersion of graphene oxide with a concentration of 0.5 mg / ml, so that the mass ratio of functionalized carbon black to graphene oxide is 2:1, and ultrasonically vibrate to make It was mixed evenly, and continued stirring at room temperature for 7h to obtain a functionalized carbon black-graphene oxide composite (FCB-GO);

[0033] 3) Add ascorbic acid to the mixed dispersion in step 2), so that the mass ratio of ascorbic acid to graphene oxide is 20, stir and react at 95°C for 12 hours, then centrifuge and wash to obtain a functionalized carbon black-graphene composite (FCB -rGO);

...

Embodiment 2

[0050] 1) Ultrasonic dispersion of carbon black in deionized water, adding cationic polymer PDDA, so that the mass ratio of carbon black to PDDA is 1:10. After ultrasonic stirring for 3 hours, wash and filter with deionized water to obtain positively charged functionalized carbon black (FCB);

[0051] 2) Redisperse the above-mentioned functionalized carbon black into deionized water, add a water dispersion of graphene oxide with a concentration of 0.5 mg / ml, so that the mass ratio of functionalized carbon black to graphene oxide is 4:1, and ultrasonically vibrate to make It was mixed evenly, and continued to stir at room temperature for 12h to obtain a functionalized carbon black-graphene oxide composite (FCB-GO);

[0052] 3) Add hydrazine hydrate to the mixed dispersion in step 2), so that the mass ratio of hydrazine hydrate to graphene oxide is 1:1, stir and react at 95°C for 6 hours, and then centrifugally wash to obtain functionalized carbon black-graphene Complex (FCB-rG...

Embodiment 3

[0056] 1) The carbon black was ultrasonically dispersed in deionized water, and the cationic polymer PDDA was added so that the mass ratio of carbon black to PDDA was 1:20. After ultrasonic stirring for 3 hours, wash and filter with deionized water to obtain positively charged functionalized carbon black (FCB);

[0057] 2) Redisperse the above-mentioned functionalized carbon black into deionized water, add a water dispersion of graphene oxide with a concentration of 0.5 mg / ml, so that the mass ratio of functionalized carbon black to graphene oxide is 1:2, and ultrasonically vibrate to make It was mixed evenly, and continued to stir at room temperature for 10h to obtain a functionalized carbon black-graphene oxide composite (FCB-GO);

[0058] 3) Add sodium borohydride to the mixed dispersion in step 2), so that the mass ratio of sodium borohydride to graphene oxide is 10, stir and react at 60° C. for 12 hours, then centrifuge and wash to obtain functionalized carbon black-graph...

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Abstract

The invention relates to a preparation method of a Pt-based catalyst for a fuel cell. According to the invention, a carbon black-graphene compound functionally modified by PDDA is synthesized based ona solution self-assembly method, and further a three-dimensional porous Pt / functionalized carbon black-graphene composite catalyst is obtained through solvothermal reduction. The study found that thethree-dimensional composite catalyst has a high specific surface area, an abundant pore channel structure, good conductivity, an excellent ion transport ability, small particle size and uniform particle size distribution. The electrochemical test result shows that the three-dimensional porous Pt / functionalized carbon black-graphene composite catalyst has excellent catalytic activity and cycle stability in oxygen reduction, and can be used as a high-efficiency cathode catalyst for proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a method for preparing a three-dimensional porous Pt / functionalized carbon black-graphene composite catalyst for low-temperature fuel cells. Background technique [0002] As a clean energy conversion device, proton exchange membrane fuel cells have the advantages of high power density, fast start-up, low operating temperature and low pollution, and show good application prospects in power sources and stationary power stations. However, the kinetic rate of the oxygen reduction reaction at the cathode is slow, requiring the use of a large amount of Pt-based catalysts, and the resource of Pt is limited and the price is high, which increases the cost of fuel cells and limits its commercial application. Therefore, in order to reduce the cost of fuel cells, the amount of Pt must be reduced, which requires the improvement of the electrocatalytic performance of Pt. In order to improve the cata...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/92
CPCY02E60/50
Inventor 邵志刚唐雪君秦晓平曹龙生杨丽梦衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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