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

A platinum-carbon catalyst and carbon material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of reduced catalytic performance of platinum meter, low catalytic activity, uneven dispersion of platinum nanoparticles, etc., to improve catalytic activity and its The effect of stability and simple process

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

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Problems solved by technology

[0005] Increasing the amount of platinum loaded is conducive to the manufacture of thinner and better-performing membrane electrodes, but in the prior art, a substantial increase in the amount of platinum loaded will lead to a significant decrease in the catalytic performance calculated by unit mass of platinum
[0006] 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

Experimental program
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preparation example Construction

[0073] A preparation method of platinum carbon catalyst, comprising:

[0074] (1) The step of manufacturing sulfur-doped conductive carbon black: mixing conductive carbon black with elemental sulfur, raising the temperature to 400°C-1500°C under an inert atmosphere, and then treating at a constant temperature for 0.5h-10h to obtain sulfur-doped conductive carbon black;

[0075] (2) Using the sulfur-doped conductive carbon black obtained in (1) as a carrier to support platinum.

[0076] According to the preparation method of the platinum-carbon catalyst of the present invention, the mass ratio of the conductive carbon black to sulfur is 20:1-2:1; preferably 10:1-4:1, more preferably 8:1-4:1.

[0077] According to the preparation method of platinum-carbon catalyst of the present invention, the sulfur-doped conductive carbon black described in (1), in its XPS analyzed S 2P Among the spectral peaks, there are only characteristic peaks of thiophene sulfur between 162ev and 166ev, ...

Embodiment 1

[0132] This example is used to illustrate the preparation of the sulfur-doped carbon support of the present invention.

[0133] Mix Ketjenblack ECP600JD and elemental sulfur evenly, the mass ratio of the two is 4:1, put it in a tube furnace, raise the temperature of the tube furnace to 1000 °C at a rate of 5 °C / min, and then treat it at a constant temperature for 2 hours. After cooling down naturally The obtained sulfur-doped conductive carbon black is coded as carbon carrier A.

[0134] Sample Characterization and Testing

[0135] The sulfur mass fraction analyzed by XPS is 0.72%; the oxygen mass fraction analyzed by XPS is 12.7%; the specific surface area is 1373m 2 / g, the pore volume is 2.31mL / g; the resistivity is 1.38Ω·m.

Embodiment 2

[0137] This example is used to illustrate the preparation of the sulfur-doped carbon support of the present invention.

[0138] Mix Vulcan XC72 and elemental sulfur evenly, the mass ratio of the two is 6:1, put it in a tube furnace, raise the temperature of the tube furnace to 400 °C at a rate of 8 °C / min, and then treat it at a constant temperature for 3 hours. After cooling down naturally Obtain sulfur-doped conductive carbon black, coded as carbon carrier B.

[0139] Sample Characterization and Testing

[0140] The sulfur mass fraction analyzed by XPS is 1.21%; the oxygen mass fraction analyzed by XPS is 8.53%; the specific surface area is 247m 2 / g, the pore volume is 0.47mL / g; the resistivity is 1.29Ω·m.

[0141] figure 1 It is the XPS spectrogram of the carbon carrier of embodiment 2.

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Abstract

The invention relates to a platinum-carbon catalyst as well as a preparation method and application thereof. The catalyst comprises sulfur-doped conductive carbon black and platinum metal loaded on the sulfur-doped conductive carbon black. When the platinum-carbon catalyst is used for oxygen reduction reaction, the mass ratio activity and the stability of the platinum-carbon catalyst are superior to those of commercial catalysts.

Description

technical field [0001] The invention relates to a platinum carbon catalyst and its preparation method and application, in particular to a sulfur-doped platinum carbon catalyst and its preparation method and application. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. It has the advantages of high energy density, fast start-up, high energy conversion efficiency, and low pollution. It is considered the most New energy technologies that have the potential to replace existing energy technologies on a large scale. Among them, hydrogen fuel cell is the current mainstream fuel cell technology, and catalyst and proton exchange membrane are the core of hydrogen fuel cell technology. [0003] Platinum-on-carbon catalysts are currently the most mature hydrogen fuel cell catalysts, but they are still insufficient for large-scale commercial app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/9041H01M4/9083H01M4/926H01M4/921H01M4/8825Y02E60/50
Inventor 荣峻峰赵红王厚朋张家康彭茜顾贤睿谢南宏
Owner CHINA PETROLEUM & CHEM CORP
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