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

A technology with an ordered structure and nanocrystals, applied in structural parts, nanotechnology, nanotechnology, etc., can solve the problems of reduced electrochemical specific surface of catalyst nanoparticles, easy dissolution of transition metals, and high energy consumption of technical routes. Achieve the effects of increased electrochemical active area, easy industrialization, and smaller size

Active Publication Date: 2021-08-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve catalyst activity, in the current research, researchers usually alloy platinum with transition metals to improve the oxygen reduction catalytic activity of platinum-based catalysts, but there are still problems with its stability: that is, under high temperature, high voltage and acidic conditions , transition metals are prone to dissolution, leading to a decrease in the activity of the catalyst
But the main problem at present is that this kind of catalyst needs to undergo heat treatment to complete the phase transition process from disorder to order, and the formed ordered alloy, that is, intermetallic compound, can greatly improve the structural stability and electrochemical stability.
[0005] High-temperature ordering treatment will lead to agglomeration of catalyst nanoparticles, reduction of electrochemical specific surface, and low utilization of platinum atoms, resulting in a decrease in catalyst activity; on the other hand, high-temperature treatment will lead to high energy consumption in technical routes, which is not conducive to Industrialization promotion

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0045] S1: According to the molar ratio of 5:4:1, take platinum acetylacetonate, zinc acetylacetonate and dibutyl tin diacetylacetonate, and dissolve them in 5 mL of oleylamine solution to make the platinum precursor concentration 0.01mol / L The solution. Under the protection of argon, the solution was stirred at 110 °C for 20 minutes, and the precursor salt was fully dissolved and mixed.

[0046] S2: Subsequently, the temperature of the solution was raised to 320° C. at a heating rate of 10° C. / min, and the reaction was continued for 2 hours, followed by centrifugal washing to obtain disordered platinum-zinc-tin nanoparticles.

[0047] S3: Weigh a certain mass of carbon powder according to the metal loading of 15%, add a mixture of ethanol and hexane with a volume ratio of 2:1, and ultrasonically disperse, and then slowly drop into the disordered platinum-zinc-tin-tricarbonate obtained in step S2 meta-nanoparticles. After ultrasonication for a period of time, centrifuge, was...

Embodiment 2

[0050] S1: According to the molar ratio of 50:35:15, take platinum acetylacetonate, nickel acetylacetonate and dibutyl tin diacetylacetonate, and dissolve them in 5 mL of oleylamine solution to make the platinum precursor concentration 0.05 mol / L The solution. Under the protection of argon, the solution was stirred at 100 °C for 20 minutes, and the precursor salt was fully dissolved and mixed.

[0051] S2: Subsequently, at a heating rate of 5°C / min, the solution was heated to 260°C, and the reaction was continued for 1 hour, followed by centrifugal washing to obtain disordered platinum-nickel-tin ternary nanoparticles;

[0052] S3: Weigh a certain mass of carbon powder according to the metal loading of 20%, add a mixture of ethanol and hexane with a volume ratio of 2:1, and ultrasonically disperse, and then slowly drop into the disordered platinum nickel tin three meta-nanoparticles. After ultrasonication for a period of time, centrifuge, wash, and dry to obtain carbon-suppo...

Embodiment 3

[0055] S1: According to the molar ratio of 50:45:5, take platinum acetylacetonate, iron acetate and dibutyl tin diacetylacetonate, and dissolve them in 5 mL of oleylamine solution to make a platinum precursor concentration of 0.01mol / L solution. Under the protection of argon, the solution was stirred at 130 °C for 20 minutes, and the precursor salt was fully dissolved and mixed.

[0056] S2: Subsequently, at a heating rate of 5°C / min, the temperature of the solution was raised to 260°C, the reaction was continued for 1 hour, and then centrifuged and washed to obtain disordered platinum-iron-tin ternary nanoparticles;

[0057] S3: Weigh a certain mass of carbon powder according to the metal loading of 10%, add a mixture of ethanol and hexane with a volume ratio of 2:1, and ultrasonically disperse, then slowly drop into the disordered platinum-iron-tin tricarbonate obtained in step S2 meta-nanoparticles. After ultrasonication for a period of time, centrifuge, wash, and dry to ...

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Abstract

The invention relates to a platinum-based intermetallic nanocrystal with an ordered structure as well as low-temperature preparation and application of the platinum-based intermetallic nanocrystal, and belongs to the field of cathode materials of proton exchange membrane fuel cells. The method comprises the following steps: dispersing a platinum salt, a transition metal salt and a salt formed by a low-melting-point metal into an organic amine solution, and reducing the metal salt in the mixed solution to obtain a disordered ternary alloy nanocrystal; loading the obtained nanocrystalline on carbon, and carrying out medium and low temperature annealing treatment on the ternary alloy to obtain the platinum-based intermetallic nanocrystalline oxygen reduction catalyst. The preparation method disclosed by the invention is simple in process, the disordered-ordered phase transition temperature of the platinum-transition metal nanocrystal catalyst can be reduced by introducing the low-melting-point metal, the energy consumption is reduced, the energy is saved, the emission is reduced, the industrial batch production is easy, and the obtained platinum-based intermetallic nanocrystal oxygen reduction catalyst has good activity and durability, and can be applied to proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the field of cathode materials for proton exchange membrane fuel cells, and more specifically relates to a structurally ordered platinum-based intermetallic nanocrystal and its medium and low temperature preparation and application, especially a platinum-based intermetallic nanocrystal oxygen reduction catalyst and its A preparation method, especially a preparation method for reducing the phase transition temperature of platinum-based intermetallic nanocrystals, a platinum-based intermetallic nanocrystal oxygen reduction catalyst for accelerating the oxygen reduction reaction rate of a fuel cell cathode, and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) can convert the chemical energy stored in fuel / oxygen into electrical energy through an electrochemical process, which has the advantages of high conversion efficiency and high specific power, and its products are non-toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9058H01M4/921H01M4/8825B82Y30/00B82Y40/00Y02E60/50
Inventor 李箐梁嘉顺
Owner HUAZHONG UNIV OF SCI & TECH
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