Platinum phosphide nano-catalyst, preparation method thereof and application of platinum phosphide nano-catalyst in electrocatalytic oxygen reduction

A platinum catalyst and catalyst technology, applied in the field of nanoscience, can solve the problems of lack of versatility, high process cost, unfavorable large-scale production, etc., and achieve the effects of avoiding the use of transition metals, large application potential, and excellent catalytic stability

Inactive Publication Date: 2019-12-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared catalyst can only be synthesized on the carrier material, which is not versatile, and requires conditions such as vacuum and high-temperature calcination, and the process cost is high, which is not conducive to large-scale industrial production.

Method used

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  • Platinum phosphide nano-catalyst, preparation method thereof and application of platinum phosphide nano-catalyst in electrocatalytic oxygen reduction
  • Platinum phosphide nano-catalyst, preparation method thereof and application of platinum phosphide nano-catalyst in electrocatalytic oxygen reduction
  • Platinum phosphide nano-catalyst, preparation method thereof and application of platinum phosphide nano-catalyst in electrocatalytic oxygen reduction

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preparation example Construction

[0038] The preparation method of platinum phosphide nano-catalyst comprises the following steps:

[0039] Step 1, dispersing the platinum catalyst in a solvent to obtain a platinum catalyst dispersion;

[0040] Step 2, adding a phosphorus source to the platinum catalyst dispersion in step 1, stirring evenly, heating and reacting, centrifuging and washing after the reaction to obtain a platinum phosphide nano-catalyst.

[0041]In step 1, the platinum catalyst is platinum nanocrystal, platinum-based alloy or supported platinum-based catalyst. Platinum-based alloys are platinum-based binary alloys such as platinum-cobalt, platinum-nickel, platinum-iron, platinum-copper, platinum, and platinum-palladium, platinum-based ternary alloys such as platinum-cobalt-nickel, platinum-rhodium-palladium, and platinum-iron-manganese, and platinum-based multiple alloys Wait. Supported platinum-based catalysts are commercial platinum / carbon, platinum / alumina, platinum / silica, platinum / titania ...

Embodiment 1

[0047] The preparation method of platinum phosphide nano-catalyst of the present invention comprises the following steps:

[0048] 1) Ultrasonic dispersion of 3.76 mg of platinum nanocubes (average particle size of 8 nm) in 10 mL of oleylamine to obtain a stable platinum catalyst dispersion, wherein the concentration of platinum is 0.376 mg / mL;

[0049] 2) Add 1.6 mL of tri-n-octylphosphine to the platinum catalyst dispersion in step 1), and stir evenly to obtain a reaction precursor;

[0050] 3) Heating and stirring the reaction precursor solution at 300° C., centrifuging and washing after reacting for 1 hour to obtain a platinum phosphide nano-catalyst. The content of phosphorus atoms in the catalyst is 4%, the morphology remains as nano-cubes, and the size does not change significantly.

Embodiment 2

[0052] The preparation method of platinum phosphide nano-catalyst of the present invention comprises the following steps:

[0053] 1) Ultrasonic dispersion of 3.76 mg of platinum nanocubes (average particle size of 8 nm) in 10 mL of oleylamine to obtain a stable platinum catalyst dispersion, wherein the concentration of platinum is 0.376 mg / mL;

[0054] 2) Add 1.6 mL of tri-n-octylphosphine to the platinum catalyst dispersion in step 1), and stir evenly to obtain a reaction precursor;

[0055] 3) heating and stirring the reaction precursor solution at 300° C., centrifuging and washing after reacting for 1.5 hours to obtain a platinum phosphide nano-catalyst. The content of phosphorus atoms in the catalyst is 10%, and the shape gradually changes to a cube with cut corners.

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Abstract

The invention provides a platinum phosphide nano-catalyst and a preparation method thereof, and application of the platinum phosphide nano-catalyst in electrocatalytic oxygen reduction. The preparation method comprises the following steps: 1) dispersing a platinum catalyst in a solvent, and carrying out uniform mixing under stirring to obtain a platinum catalyst dispersion liquid; and 2) adding aphosphorus source into the platinum catalyst dispersion liquid, carrying out uniform mixing under stirring, carrying out a reaction at a certain temperature, and performing centrifuging and washing after the reaction is finished so as to obtain the platinum phosphide nano-catalyst. According to the method, phosphorus atoms generated by decomposition of the phosphorus source are diffused into the platinum catalyst at a certain temperature, so the platinum phosphide nano-catalyst with a specific electronic structure is synthesized. The preparation method has the advantages of simple process, lowcost, good repeatability, no environmental pollution and convenience in large-batch preparation; and the prepared platinum phosphide nano-catalyst shows far higher catalytic activity and stability inan electrocatalytic oxygen reduction reaction compared with commercial platinum/carbon catalysts, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of nanometer science, and in particular relates to a platinum phosphide nanometer catalyst, its preparation method and its application in electrocatalytic oxygen reduction. Background technique [0002] Platinum catalysts have shown excellent catalytic performance in the fields of energy, chemistry and petrochemical industry, especially in fuel cells, automobile exhaust purification, hydrogenation, dehydrogenation and other industrial catalytic reactions. However, platinum resources are scarce and concentrated in a few countries and regions, making it expensive and extremely expensive to use, which seriously hinders its large-scale application in modern industry. Therefore, improving the catalytic performance of platinum catalysts and reducing the amount of platinum has become a major research hotspot in energy science, which is of great significance for promoting economic development and saving resources. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08B82Y30/00B82Y40/00B01J27/185B01J35/00
CPCB01J27/1856B01J35/0033B82Y30/00B82Y40/00C01B25/08
Inventor 金明尚郭瑞雲
Owner XI AN JIAOTONG UNIV
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