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Carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst

A platinum-carbon catalyst and carbon material technology, applied in the preparation/purification of carbon, nanotechnology for materials and surface science, structural parts, etc., can solve the problem of uneven dispersion of platinum nanoparticles, accelerated carbon corrosion reaction, and catalytic activity Low-level problems, to achieve excellent comprehensive catalytic performance and carbon corrosion resistance, improve catalytic performance, and simple process

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery is running in an open circuit, the cathode potential can be higher than 0.9V. During the battery start / stop process, the local interface potential of the cathode can even reach 1.6V, which greatly accelerates the carbon corrosion reaction, resulting in a sharp decline in the performance of the platinum-carbon catalyst.
In addition, platinum will also accelerate the carbon corrosion rate, the greater the platinum loading, the faster the carbon corrosion
The price of conductive carbon black is low, and it is the platinum carbon catalyst carrier used in industry, but the corrosion resistance of conductive carbon black is poor
On the one hand, more defect sites on the carbon support are beneficial to increase the amount of platinum loaded, but at the same time aggravate carbon corrosion.
On the other hand, increasing the degree of graphitization can alleviate carbon corrosion, but it also makes the surface of the carbon support chemically inert, making it difficult to evenly disperse platinum on the carbon support.
[0007] 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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  • Carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst
  • Carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst
  • Carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst

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preparation example Construction

[0123] The present invention also provides a method for preparing carbon materials, comprising: contacting conductive carbon black with sulfur source, nitrogen source, phosphorus source and boron source, and treating (preferably constant temperature treatment) at 400°C to 900°C in an inert gas for 0.5 h to 10 h to obtain the carbon material.

[0124] According to the preparation method of the carbon material of the present invention, the conductive carbon black can be Ketjen black (Ketjen black) series of superconducting carbon blacks, Cabot series of conductive carbon blacks and series of conductive carbon blacks produced by Evonik Degussa. One or more; preferably EC-300J, EC-600JD, ECP-600JD, VXC72, Black pearls 2000, PRINTEX XE2-B, PRINTEX L6 or HIBLAXK 40B2.

[0125] According to the preparation method of the carbon material of the present invention, there is no limitation on the preparation method and source of the conductive carbon black. The conductive carbon black may...

Embodiment 1

[0205] This example is used to illustrate the preparation of sulfur nitrogen phosphorus boron doped carbon material of the present invention.

[0206] Immerse 1g of Vulcan XC72 in 20mL aqueous solution with ammonia concentration of 1.5wt%, sodium borate concentration of 0.4wt%, and phosphoric acid concentration of 1.2wt% for 20h; dry in an oven at 100°C; then mix with 0.167g elemental sulfur Evenly, put it into a tube furnace, raise the temperature of the tube furnace to 900 °C at a rate of 8 °C / min, and treat it at a constant temperature for 3 hours; after natural cooling, a carbon material doped with sulfur, nitrogen, phosphorus, and boron is obtained, and the number is carbon carrier A.

[0207] Sample Characterization and Testing

[0208] The mass fraction of sulfur by XPS analysis is 0.5%; the mass fraction of nitrogen by XPS analysis is 3.1%; the mass fraction of phosphorus by XPS analysis is 1.4%; the mass fraction of boron by XPS analysis is 0.6%; the specific surface ...

Embodiment 2

[0215] This example is used to illustrate the preparation of sulfur nitrogen phosphorus boron doped carbon material of the present invention.

[0216] Add 10mL absolute ethanol to 1g Ketjenblack ECP600JD, then add 25mL aqueous solution with urea concentration of 0.5wt%, boric acid concentration of 1.0wt%, and sodium dihydrogen phosphate concentration of 0.4wt% for 24 hours; bake in an oven at 100°C Dry; then mix with 0.25g elemental sulfur and nitrogen evenly, put it into a tube furnace, raise the temperature of the tube furnace to 500 °C at a rate of 5 °C / min, and treat it at a constant temperature for 3 hours; after natural cooling, sulfur, nitrogen, phosphorus, boron doped carbon Material, numbered as carbon support B.

[0217] Sample Characterization and Testing

[0218] The mass fraction of sulfur by XPS analysis is 0.9%; the mass fraction of nitrogen by XPS analysis is 1.7%; the mass fraction of phosphorus by XPS analysis is 0.4%; the mass fraction of boron by XPS analy...

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Abstract

The invention relates to a carbon material, a platinum-carbon catalyst and a preparation method and application thereof. Wherein the carbon material is sulfur, nitrogen, phosphorus and boron doped conductive carbon black, and the fuel cell platinum-carbon catalyst taking the carbon material as a carrier, especially the platinum-carbon catalyst with high platinum loading amount, has excellent catalytic performance and good carbon corrosion resistance.

Description

technical field [0001] The invention relates to a carbon material, a platinum-carbon catalyst and a preparation method and application thereof. Specifically, the present invention relates to a carbon material doped with sulfur, nitrogen, phosphorus, and boron, a platinum-carbon catalyst using it as a carrier, and their preparation methods and applications. Background technique [0002] In the field of chemistry, carbon materials are not only important supports, but also commonly used catalysts. Carbon elements are rich in bonding methods, and carbon materials can be modified in various ways in order to obtain more suitable properties. [0003] Oxygen reduction reaction (ORR) is a key reaction in the field of electrochemistry, for example, in fuel cells and metal-air batteries, the oxygen reduction reaction is the main factor affecting the battery performance. Carbon materials doped with atoms can be directly used as catalysts for oxygen reduction reactions. When used as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/92B82Y30/00B82Y40/00
CPCC01B32/05H01M4/926B82Y30/00B82Y40/00
Inventor 荣峻峰赵红谢南宏顾贤睿张家康王厚朋彭茜张云阁
Owner CHINA PETROLEUM & CHEM CORP