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Platinum-based intermetallic nanocrystal with ordered structure and preparation and application thereof

A technology with ordered structure and nanocrystals, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of nanoparticle agglomeration, low catalyst activity, high preparation cost, etc., achieve reduced agglomeration, high catalytic ability, and simple preparation method Effect

Active Publication Date: 2021-08-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a simple and environmentally friendly preparation method of a platinum-based intermetallic nanocrystalline oxygen reduction catalyst with a completely ordered structure. Carbon-supported platinum nanoparticles are obtained on carbon, and then transition metal salts are introduced for hydrolysis, and metal oxides are coated on the surface of carbon-supported platinum to obtain a composite of carbon-supported platinum and active metal oxides. The composite is annealed to obtain a uniform size , and a platinum-based intermetallic nanocrystalline oxygen reduction catalyst with a small particle size, so as to solve the technical problems of nanoparticle agglomeration, low catalyst activity, high preparation cost, high toxicity, and unfavorable environmental protection in the prior art

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  • Platinum-based intermetallic nanocrystal with ordered structure and preparation and application thereof
  • Platinum-based intermetallic nanocrystal with ordered structure and preparation and application thereof
  • Platinum-based intermetallic nanocrystal with ordered structure and preparation and application thereof

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preparation example Construction

[0035] The embodiment of the present invention provides a simple and environmentally friendly method for preparing a platinum-based intermetallic nanocrystalline oxygen reduction catalyst with a completely ordered structure. The preparation process is as follows: figure 1 As shown, it specifically includes the following steps:

[0036] (1) ultrasonically disperse the carbon powder into the polyol solution to obtain a carbon powder dispersion with a concentration of 0.5 to 5 mg / mL, and dissolve the platinum salt in deionized water to obtain a platinum salt solution with a concentration of 5 to 50 mg / mL, Measure the platinum solution and carbon dispersion according to a certain platinum / carbon ratio, weigh the surfactant according to a certain ratio of surfactant / platinum substance, and stir at 100°C to 130°C under the condition of condensation and reflux React for 0.5 to 1 hour to obtain a carbon-supported platinum nanoparticle solution;

[0037] (2) After dissolving the trans...

Embodiment 1

[0042] (1) Dissolve 1g of chloroplatinic acid in 100mL of deionized aqueous solution to make a platinum salt solution with a concentration of 10mg / mL, take 16mg of carbon powder and disperse it in 8mL of ethylene glycol solution, add 1mL of platinum salt solution, and add 1.6g Polyvinylpyrrolidone (molecular weight 8000), ultrasonically mixed uniformly; under the condition of condensation and reflux, stirred and reacted at 130°C for 1 hour to obtain a carbon-supported platinum nanoparticle solution;

[0043] (2) Weigh 100 mg of zinc acetate powder, dissolve it in 1 mL of deionized water, slowly add the zinc acetate solution into the carbon-supported platinum nanoparticles solution, and stir evenly with ultrasonic;

[0044] (3) Under the condition of condensation and reflux, the solution is heated and reacted, stirred and reacted at 130°C for 1 hour, the transition metal salt is hydrolyzed on the surface of carbon-supported platinum to obtain an oxide coating layer, and after ce...

Embodiment 2

[0048] (1) Take 1g of chloroplatinic acid and dissolve it in 20mL of deionized aqueous solution to make a platinum salt solution with a concentration of 50mg / mL, take 40mg of carbon powder and disperse it in 8mL of 2-propylene glycol alcohol solution, add 1mL of platinum salt solution, and add 80mg of poly Vinylpyrrolidone (molecular weight 8000), ultrasonically mixed uniformly; under the condition of condensation and reflux, stirred and reacted at 130°C for 2 hours to obtain a carbon-supported platinum nanoparticle solution;

[0049] (2) Weigh 200 mg of ferric chloride powder, dissolve it in 1 mL of deionized water, slowly add the ferric chloride solution into the carbon-supported platinum nanoparticle solution, and stir evenly with ultrasonic;

[0050] (3) Under the condition of condensation and reflux, the solution is heated and reacted, stirred and reacted at 130°C for 1 hour, ferric chloride is hydrolyzed on the surface of carbon-supported platinum to obtain an oxide coati...

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Abstract

The invention discloses a platinum-based intermetallic nanocrystal with an ordered structure as well as preparation and application thereof, and belongs to the field of cathode catalytic materials of proton exchange membrane fuel cells. The method comprises the steps: mixing a platinum salt solution and the carbon powder dispersion liquid to obtain a mixed solution, reducing platinum salt in the mixed solution, and compounding the reduced platinum salt with carbon powder to obtain carbon-loaded platinum nanoparticles; on the basis of carbon-supported platinum nanoparticles, obtaining a carbon-supported platinum and metal oxide compound by hydrolyzing transition metal salt, and annealing the compound to obtain the superfine platinum-based intermetallic nanocrystalline oxygen reduction catalyst. The preparation method is simple in process, green and environmentally friendly, disordered-ordered structure conversion of nanocrystals can be effectively promoted, the size of nanoparticles can be effectively regulated and controlled, batch production is easy, and the obtained platinum-based intermetallic nanocrystal oxygen reduction catalyst has good activity and durability and has a remarkable effect when applied to a proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cell cathode catalytic materials, more specifically, relates to a structurally ordered platinum-based intermetallic nanocrystal and its preparation and application, especially a platinum for accelerating the oxygen reduction reaction rate of fuel cell cathode An intermetallic nanocrystalline oxygen reduction catalyst and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is a power generation device that directly converts chemical energy into electrical energy. It has the advantages of high energy density, abundant fuel sources, and environmental friendliness. It is a current research hotspot. Since the oxygen reduction reaction rate of the PEMFC cathode is much smaller than that of the anode hydrogen oxidation reaction, noble metal platinum is needed as a catalyst to accelerate the rate of the oxygen reduction reaction. In the curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/9083H01M4/9016H01M4/926H01M4/923H01M4/8825H01M4/8882Y02E60/50
Inventor 李箐梁嘉顺
Owner HUAZHONG UNIV OF SCI & TECH
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