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A kind of preparation method of carbon-coated platinum catalyst with high stability and low load

A platinum catalyst and high stability technology, which is applied in the field of materials and electrochemistry, can solve the problems of active site deactivation, performance degradation of platinum-based catalysts, and inability to inhibit the fusion of platinum components and platinum nanoparticles, so as to avoid deactivation, The effect of improving cycle stability

Active Publication Date: 2021-10-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst prepared by this method can fully expose the catalytic active sites, it cannot inhibit the dissolution of platinum components and the fusion of adjacent platinum nanoparticles during the long cycle process.
At the same time, studies have shown that the direct contact of the sulfonic acid groups in Nafion, an ionic polymer used in commercial fuel cells, with Pt will cause the deactivation of the active sites.
All of the above factors will lead to a significant decline in the performance of existing commercial platinum-based catalysts in the application process

Method used

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  • A kind of preparation method of carbon-coated platinum catalyst with high stability and low load
  • A kind of preparation method of carbon-coated platinum catalyst with high stability and low load
  • A kind of preparation method of carbon-coated platinum catalyst with high stability and low load

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Take 0.16g of platinum acetylacetonate, 2g of oleic acid, 12g of oleylamine and 17.6g of benzyl ether in a 100mL three-neck flask, stir it at 80°C, then raise the temperature to 110°C, and vacuum for 1 hour. Take 0.16g of manganese carbonyl and dissolve it in 1mL of chloroform for later use. In a nitrogen atmosphere, the temperature of the reaction system was raised to 160° C., and a chloroform solution of manganese carbonyl was injected, and then reacted at 200° C. for 0.5 hour to complete the experiment. Finally, after 100 mL of ethanol centrifugation and washing twice, it was dispersed in 10 mL of chloroform to complete the preparation of platinum nanoparticles.

[0025] (2) Take 30 mg of Ketjen Black and disperse it in 30 mL of chloroform, add 3 mL of platinum nanoparticle solution, then sonicate for 10 minutes, and then place it in an oven at 80°C to evaporate to dryness to obtain a mixed solid of platinum nanoparticles and Ketjen Black.

[0026] (3) Mix the s...

Embodiment 2

[0031] (1) Take 0.8g of platinum acetylacetonate, 10g of oleic acid, 60g of oleylamine and 88g of benzyl ether in a 500mL three-necked flask, stir it evenly at 80°C, then raise the temperature to 110°C, and vacuum for 2 hours. Take 0.8g of manganese carbonyl and dissolve it in 5mL of chloroform for later use. In a nitrogen atmosphere, the temperature of the reaction system was raised to 160° C., and a chloroform solution of manganese carbonyl was injected, and then reacted at 200° C. for 0.5 hour to complete the experiment. Finally, after 500 mL of ethanol centrifugation and washing twice, the platinum nanoparticles were dispersed in 50 mL of chloroform to complete the preparation of platinum nanoparticles.

[0032] (2) Take 50 mg of Ketjen Black and disperse it in 50 mL of chloroform, add 5 mL of platinum nanoparticle solution, then sonicate for 15 minutes, and then place it in an oven at 80°C to evaporate to dryness to obtain a mixed solid of platinum nanoparticles and Ketje...

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Abstract

The invention provides a preparation method of a carbon-coated platinum catalyst with high stability and low load. The carbon coating layer can effectively stabilize the platinum catalyst and realize excellent long-cycle performance. The invention firstly synthesizes platinum nanoparticles coated with oleylamine, then co-assembles Ketjen black and platinum nanoparticles, and completes the preparation of carbon-coated platinum catalyst through ligand pre-crosslinking, carbonization, high-temperature activation and other means. The carbon-coated platinum catalyst prepared in the present invention is due to the existence of the unique carbon coating layer. On the one hand, it effectively stabilizes the internal platinum nanoparticles, avoids the dissolution of the platinum component and the adjacent platinum nanoparticles in the long cycle process under acidic conditions. On the other hand, it blocks the direct contact between the ionomer and the platinum nanoparticles, thereby avoiding the reduction of the catalytic activity of the platinum nanoparticles by the sulfonic acid groups in the ionomer.

Description

technical field [0001] The invention belongs to the field of materials and electrochemistry, specifically a method for preparing a novel low-loaded carbon-coated platinum catalyst to achieve high-stability electrocatalytic oxygen reduction, especially a direct contact between a stable platinum component and a barrier spacer polymer Preparation method of high stability and low loading carbon-coated platinum catalyst. [0002] technical background [0003] With the continuous advancement of human science and technology, the rapid expansion of industrial production and the continuous growth of the world population, the global energy consumption has increased rapidly. At the same time, the traditional limited fossil energy represented by petroleum and coal is becoming increasingly exhausted, and scientists from all over the world are gradually focusing on clean energy and its storage and conversion devices. As an energy conversion device, the fuel cell has the advantages of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B82Y40/00
CPCB82Y40/00H01M4/926Y02E60/50
Inventor 董安钢邹金祥李志成蔡青福杨东
Owner FUDAN UNIV