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Platinum-carbon catalyst as well as preparation method and application thereof

A platinum-carbon catalyst and catalyst technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low catalytic activity, uneven dispersion of platinum nanoparticles, and low platinum utilization rate, and achieve simple process, improved stability, The effect of improving stability

Active Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical reduction method is a commonly used method for the manufacture of platinum-carbon catalysts. The advantage is that the process is simple, and the disadvantage is that the utilization rate of platinum is low and the catalytic activity is low.
The reason may be that the irregular carbon support pore structure leads to uneven dispersion of platinum nanoparticles.

Method used

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  • Platinum-carbon catalyst as well as preparation method and application thereof
  • Platinum-carbon catalyst as well as preparation method and application thereof
  • Platinum-carbon catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0066] A method for preparing a platinum-carbon catalyst, comprising: (1) a step of impregnating a nitrogen source: mixing a carbon material with an aqueous solution of a nitrogen source, and impregnating it to obtain a carbon material impregnated with a nitrogen source; (2) manufacturing a nitrogen-doped carbon material Step: raise the temperature of the carbon material impregnated with nitrogen source obtained in (1) to 1000°C to 1500°C at a rate of 8°C / min to 15°C / min in an inert gas, and then perform constant temperature treatment for 0.5h to 10h to obtain Nitrogen-doped carbon material; (3) step of supporting platinum: using the nitrogen-doped carbon material obtained in (2) as a carrier to support platinum.

[0067] According to the preparation method of the platinum-carbon catalyst of the present invention, the temperature of the constant treatment may be 1000°C to 1500°C, preferably 1150°C to 1450°C; the treatment time may be 0.5h to 10h, preferably 1h to 5h, more prefe...

Embodiment 1

[0113] This example is used to illustrate the preparation of the nitrogen-doped carbon support of the present invention.

[0114] Immerse 1g of Vulcan XC72 in 20mL of 2.5wt% ammonia solution for 24h; dry it in an oven at 100°C; then put it into a tube furnace and raise the temperature of the tube furnace to 1100°C at a rate of 8°C / min. Constant temperature treatment for 3 hours; nitrogen-doped carbon support was obtained after natural cooling, numbered as carbon support A.

[0115] Sample Characterization and Testing

[0116] The nitrogen mass fraction analyzed by XPS is 1.43%; the oxygen mass fraction analyzed by XPS is 9.31%; the specific surface area is 239m 2 / g; resistivity 1.28Ω·m.

[0117] figure 1 It is the XPS spectrogram of the carbon carrier A of embodiment 1.

Embodiment 2

[0119] This example is used to illustrate the preparation of the nitrogen-doped carbon support of the present invention.

[0120] Immerse 1g of Vulcan XC72 in 15mL of 0.7wt% aqueous urea solution for 24h; dry it in an oven at 100°C; Constant temperature treatment for 3 hours; nitrogen-doped carbon support was obtained after natural cooling, numbered as carbon support B.

[0121] Sample Characterization and Testing

[0122] The mass fraction of nitrogen by XPS analysis is 0.68%; the mass fraction of oxygen by XPS analysis is 8.92%; the resistivity is 1.25Ω·m.

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Abstract

The invention relates to a platinum-carbon catalyst and a preparation method and application thereof, in N1s spectral peaks of XPS analysis of the platinum-carbon catalyst, except for a characteristic peak between 399 ev and 400.5 ev, no other characteristic peak exists between 395 ev and 405 ev. When the platinum-carbon catalyst is used for oxygen reduction reaction, the platinum-carbon catalyst has higher mass ratio activity and stability.

Description

technical field [0001] The invention relates to a platinum-carbon catalyst and its preparation method and application, in particular to a nitrogen-doped platinum-carbon catalyst and its preparation method and application. Background technique [0002] A fuel cell is a power generation device that converts chemical energy into electrical energy in an electrochemical reaction, and is considered the most promising large-scale replacement of existing energy technologies. Hydrogen fuel cell is currently the mainstream fuel cell technology, and catalyst and proton exchange membrane are the core of hydrogen fuel cell technology. In the development of hydrogen fuel cells, the fabrication of efficient and low-cost electrode catalysts, especially cathode oxygen reduction electrode catalysts, has been a hot topic of scientific research. [0003] Nitrogen can be doped with carbon materials in a variety of structural forms, such as pyridinic nitrogen, graphitic nitrogen, pyrrole nitroge...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/9041H01M4/9083H01M4/926H01M4/921H01M4/8825Y02E60/50
Inventor 彭茜荣峻峰赵红王厚朋谢南宏顾贤睿张家康张云阁
Owner CHINA PETROLEUM & CHEM CORP
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