Phosphorus-boron-doped carbon material, platinum-carbon catalyst and preparation method and application thereof

A platinum-carbon catalyst, boron-doped technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, carbon compounds, etc., can solve the problem of uneven dispersion of platinum nanoparticles, difficult platinum uniform dispersion, catalytic Problems such as low activity, to achieve the effect of easy mass ratio activity and stability, good ECSA, 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

Increasing the degree of graphitization can effectively alleviate carbon corrosion, but the high degree of graphitization also makes the surface of the carbon carrier chemically inert, making it difficult to evenly disperse platinum on the carbon carrier, especially when the amount of platinum loaded is high
[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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  • Phosphorus-boron-doped carbon material, platinum-carbon catalyst and preparation method and application thereof
  • Phosphorus-boron-doped carbon material, platinum-carbon catalyst and preparation method and application thereof
  • Phosphorus-boron-doped carbon material, platinum-carbon catalyst and preparation method and application thereof

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preparation example Construction

[0106] The present invention also provides a method for preparing a phosphorus-boron-doped carbon material, comprising: contacting the carbon material with a boron source and a phosphorus source, and treating (preferably constant temperature treatment) at 400°C to 900°C for 0.5h to 10h in an inert gas , to obtain the phosphorus-boron-doped carbon material.

[0107] According to the preparation method of the phosphorus-boron doped carbon material of the present invention, the carbon material is contacted with the boron source and the phosphorus source in a mixed manner. The present invention has no limitation on the order and manner of mixing carbon materials, boron sources and phosphorus sources, and those skilled in the art can select a suitable order and manner according to the teaching of the present invention and / or existing knowledge. The present invention provides a preferred mixing method: mixing carbon material with boron source and phosphorus source solutions (prefera...

Embodiment 1

[0175] This example is used to illustrate the preparation of the boron and phosphorus doped carbon material of the present invention.

[0176] Immerse 1g of Vulcan XC72 in 15mL aqueous solution with phosphoric acid concentration of 2.7wt% and sodium borate concentration of 2.6wt% for 24h; dry it in an oven at 100°C; then put it into a tube furnace at 10°C / min The temperature of the tube furnace was raised to 850°C, and the constant temperature was treated for 2 hours; after natural cooling, a boron-phosphorus-doped carbon material was obtained, which was designated as carbon carrier A.

[0177] Sample Characterization and Testing

[0178] The mass fraction of boron analyzed by XPS is 1.8%; the mass fraction of phosphorus analyzed by XPS is 1.1%; the specific surface area is 249m 2 / g; resistivity 1.30Ω·m.

[0179] figure 1 It is the XPS spectrum of the boron of the boron-phosphorus-doped carbon material of Example 1.

[0180] figure 2 It is the XPS spectrum of the phosph...

Embodiment 2

[0182] This example is used to illustrate the preparation of the boron and phosphorus doped carbon material of the present invention.

[0183] Immerse 1g of Vulcan XC72 in 15mL of an aqueous solution with a concentration of 0.6wt% sodium dihydrogen phosphate and a concentration of boric acid of 0.9wt% for 20h; dry it in an oven at 100°C; then put it into a tube furnace at 8°C / The tube furnace was heated up to 550°C at a rate of 1 min, and treated at a constant temperature for 2 hours; after natural cooling, a boron-phosphorus-doped carbon material was obtained, which was designated as carbon carrier B.

[0184] Sample Characterization and Testing

[0185] The boron mass fraction analyzed by XPS is 1.1%; the phosphorus mass fraction analyzed by XPS is 0.4%; the X specific surface area is 256m 2 / g; resistivity 1.26Ω·m.

[0186] image 3 It is the XPS spectrum of the boron of the boron and phosphorus doped carbon material of embodiment 2.

[0187] Figure 4 It is the XPS s...

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Abstract

The invention relates to a phosphorus-boron-doped carbon material, a platinum-carbon catalyst and a preparation method and application of the phosphorus-boron-doped carbon material and the platinum-carbon catalyst, and the phosphorus-boron-doped carbon material has a characteristic peak at 190.5 +/-0.5 eV in a B1s spectrum peak of XPS analysis of the phosphorus-boron-doped carbon material. A platinum-carbon catalyst taking the phosphorus-boron doped carbon material as a carrier has good mass ratio activity, ECSA and excellent ECSA stability.

Description

technical field [0001] The invention relates to a phosphorus-boron doped carbon material, a platinum-carbon catalyst and a preparation method and application thereof. 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 an oxygen reduction catalyst, it has been reported in the literature that nitrogen, phosphorus, boron, sulfur, fluorine, chlorine, bromine, iodine and other elements are doped into carbon materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92C01B32/168C01B32/194B82Y30/00B82Y40/00
CPCH01M4/926C01B32/194C01B32/168B82Y30/00B82Y40/00C01B2204/32C01B2204/20C01B2204/22C01B2202/32C01B2202/20C01B2202/22
Inventor 王厚朋荣峻峰赵红彭茜张家康谢南宏顾贤睿
Owner CHINA PETROLEUM & CHEM CORP
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