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A structurally ordered platinum-based intermetallic nanocrystal and its preparation and application at medium and low temperatures

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

Active Publication Date: 2022-04-12
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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  • A structurally ordered platinum-based intermetallic nanocrystal and its preparation and application at medium and low temperatures
  • A structurally ordered platinum-based intermetallic nanocrystal and its preparation and application at medium and low temperatures
  • A structurally ordered platinum-based intermetallic nanocrystal and its preparation and application at medium and low temperatures

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] S1: According to the molar ratio of 5: 4: 1, acetyl acetinate platinum, acetylacetone zinc, and dibutyldiacetyltin, and dissolved in a 5 mL olelamine solution, mounted to a platinum precursor concentration of 0.01 mol / L The solution. Under argon, the solution was stirred at 110 ° C for 20 minutes, and the precursor salt was fully dissolved.

[0046] S2: Subsequently, the solution was raised to 320 ° C at a heating rate of 10 ° C / min, and the reaction was continued for 2 hours, then centrifuged, and nanoparticles disordered platinum zinc tin.

[0047] S3: The carbon powder having a certain mass of 15% is weighed with a mixture of ethanol and a mixture of ethanol and hexanes having a volume ratio of 2: 1, and the ultrasonic dispersion is subsequently dropped. Non-nanoparticles. After a period of time, centrifugation, washing, drying, to obtain carbon-free disfrunitable platinum zinc tin three-dimensional nanoparticles;

[0048] S4: The obtained carbon-free platinum zinc t...

Embodiment 2

[0050] S1: According to the molar ratio of 50:35:15, acetyl acetinate platinum, acetylacetone nickel, and dibutyl diacetinyltin, and dissolved in a 5 mL olelamine solution, formulated into a platinum precursor concentration of 0.05 mol / L The solution. Under argon, the solution was stirred at 100 ° C for 20 minutes, and the precursor salt was fully dissolved.

[0051] S2: Subsequently, the solution was warmed to 260 ° C at a heating rate of 5 ° C / min, and the reaction was continued for 1 hour, then centrifugation was washed, and the disprofer platinum nickel tin three dollars were obtained;

[0052] S3: The carbon powder having a certain mass of 20% is weighed with a mixture of ethanol and hexane volume ratio of 2: 1, and the ultrasonic dispersion is subsequently dispersed, and then slowly dropped into step S2 obtained from the disprising platinum nickel tin three. Non-nanoparticles. After a period of time, centrifugation, washing, drying, to obtain carbon-free disprise platinu...

Embodiment 3

[0055] S1: According to the molar ratio of 50: 45: 5, acetyl acetiptiplatin, iron acetate, and dibutyl diacetatetin, and dissolved in a 5 mL olelamine solution, formulated into a platinum precursor concentration of 0.01 mol / L Solution. Under argon, the solution was stirred at 130 ° C for 20 minutes, and the precursor salt was sufficiently dissolved.

[0056] S2: Subsequently, the solution was warmed to 260 ° C at a temperature rise rate of 5 ° C / min, and the reaction was continued for 1 hour, then centrifuged, resulting in disorderly platinum iron tin three-dimensional nanoparticles;

[0057] S3: The toner of a certain mass of 10% is weighed with a mixture of ethanol and a mixture of ethanol and hexanes having a volume ratio of 2: 1, and the ultrasonic dispersion is subsequently dripped into step S2. Platinum Tin 3. Non-nanoparticles. After a period of time, centrifugation, washing, drying, to obtain carbon-free disorderly platinum iron tin three-dimensional nanoparticles;

[...

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Abstract

The invention relates to a structurally ordered platinum-based intermetallic nanocrystal and its medium and low temperature preparation and application, belonging to the field of proton exchange membrane fuel cell cathode materials. Disperse the salt formed by platinum salt, transition metal salt and low melting point metal into the organic amine solution, and the metal salt in the mixed solution is reduced to obtain disordered ternary alloy nanocrystals; the obtained nanocrystals are loaded on carbon, and the three The platinum-based intermetallic nanocrystalline oxygen reduction catalyst can be obtained by annealing the alloy at a medium and low temperature. The preparation method of the present invention has a simple process, and can reduce the disordered-ordered phase transition temperature of the platinum-transition metal nanocrystal catalyst through the introduction of low-melting point metals, reduce energy consumption, save energy and reduce emissions, and are easy to industrialized batch production, and the obtained Platinum-based intermetallic nanocrystalline oxygen reduction catalysts have good activity and durability, and can be applied to proton exchange membrane fuel cells.

Description

Technical field [0001] The present invention belongs to the field of proton exchange membrane fuel cell cathode material, and more particularly to a structural ordered platinum-based nanocrystalline and a low temperature preparation and application, and more particularly to a platinum-based nanocrystalline oxygen reducing catalyst. The preparation method, particularly a method for lowering the preparation of platinum-based nanocrystalline phase transition temperature and a platinum-based nanocrystalline oxygen reducing catalyst for accelerating the cathode oxygen reducing reaction rate of fuel cells and the preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell, PEMFC) can be converted into electrical energy in fuel / oxygen in the electrochemical process, with high conversion efficiency, high specific to power, and its product is non-toxic The harmless water is environmentally friendly energy. [0003] At present, the bottleneck application ...

Claims

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Application Information

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Patent Type & Authority Patents(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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