Doped 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 field of doped carbon materials, can solve the problems of uneven dispersion of platinum nanoparticles, performance degradation of platinum-carbon catalyst, accelerated carbon corrosion reaction, etc., and achieve excellent comprehensive catalytic performance and excellent carbon resistance. Corrosion ability, the effect of improving catalytic performance

Active 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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  • Doped carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst
  • Doped carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst
  • Doped carbon material, platinum-carbon catalyst and preparation method and application of platinum-carbon catalyst

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Experimental program
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preparation example Construction

[0152] The invention provides a preparation method of platinum carbon catalyst, comprising:

[0153] (1) The steps of manufacturing carbon carrier: first contact the carbon material with phosphorus source and boron source, and treat it in inert gas at 300 ℃ ~ 800 ℃ for 0.5h ~ 10h; Then, contact with the sulfur source and treat it in inert gas at 400 ℃ ~ 1000 ℃ for 0.5h ~ 10h to obtain the carbon carrier;

[0154] (2) The step of loading platinum with the carbon carrier obtained in (1).

[0155] According to the preparation method of the platinum carbon catalyst of the invention, in (1), "the contact mode between the carbon material and the sulfur source, phosphorus source and boron source" is the same as the corresponding part in the previous text, which will not be repeated in the invention.

[0156] According to the preparation method of the platinum carbon catalyst of the invention, the sulfur source is elemental sulfur.

[0157] According to the preparation method of the plati...

Embodiment 1

[0192] The embodiment is used to illustrate the preparation of sulfur phosphorus boron doped carbon material of the invention.

[0193] Immerse 1g Vulcan XC72 in 15ml aqueous solution with sodium borate concentration of 2.0wt% and phosphoric acid concentration of 0.5wt% for 24h; Drying in an oven at 100 ℃; Then put it into the tubular furnace and raise the temperature of the tubular furnace to 450 ℃ at the rate of 5 ℃ / min for 2h; Boron and phosphorus doped carbon materials were obtained after natural cooling.

[0194] Mix the boron phosphorus doped carbon material with 0.167g elemental sulfur evenly, put it into the tubular furnace, and heat the tubular furnace to 700 ℃ at the rate of 5 ℃ / min for constant temperature treatment for 3h; After natural cooling, sulfur boron phosphorus doped carbon material is obtained, which is numbered as carbon carrier a.

[0195] Sample characterization and testing

[0196] The mass fraction of sulfur analyzed by XPS is 0.8%; The mass fraction ...

Embodiment 2

[0202] The embodiment is used to illustrate the preparation of sulfur phosphorus boron doped carbon material of the invention.

[0203] Add 10ml absolute ethanol to 1g ketjenblack ecp600jd, and then add 25ml aqueous solution with boric acid concentration of 0.4wt% and sodium phosphate concentration of 2.0wt% for immersion for 24h; Drying in an oven at 100 ℃; Then put it into the tubular furnace and raise the temperature of the tubular furnace to 700 ℃ at the rate of 5 ℃ / min for 2h; Boron and phosphorus doped carbon materials were obtained after natural cooling.

[0204] Mix the boron phosphorus doped carbon material with 0.25g elemental sulfur evenly, put it into the tubular furnace, and heat the tubular furnace to 400 ℃ at the rate of 5 ℃ / min for constant temperature treatment for 3h; After natural cooling, sulfur boron phosphorus doped carbon material is obtained, which is numbered as carbon carrier B.

[0205] Sample characterization and testing

[0206] The mass fraction o...

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Abstract

The invention relates to a doped carbon material, a platinum-carbon catalyst and a preparation method and application thereof. In the XPS analysis of the carbon material, a characteristic peak exists at 135.8 +/-0.5 ev. The platinum-carbon catalyst prepared from the carbon material has excellent catalytic performance and carbon corrosion resistance when being used for catalyzing oxygen reduction reaction.

Description

technical field [0001] The invention relates to a doped carbon material, a platinum carbon catalyst and a preparation method and application thereof. Specifically, it relates to a phosphorus doped carbon material and a platinum carbon catalyst using it as a carrier, as well as a preparation method and application of the two. Background technology [0002] In the field of chemistry, carbon material is not only an important carrier, but also a common catalyst. There are abundant bonding modes of carbon elements. 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 cells, oxygen reduction reaction is the main factor affecting the performance of cells. Carbon materials doped with atoms can be directly used as catalysts for oxygen reduction reactions. When used as oxygen reduction catalyst, it has been reported t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/92B82Y30/00B82Y40/00
CPCC01B32/05H01M4/926B82Y30/00B82Y40/00Y02E60/50
Inventor 荣峻峰赵红顾贤睿彭茜张家康王厚朋谢南宏张云阁
Owner CHINA PETROLEUM & CHEM CORP
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