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Platinum alloy nanocrystalline catalyst, and preparation method and application thereof

A technology of nanocrystals and catalysts, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of catalyst nanoparticle agglomeration, reduction of electrochemical specific surface area, increase of preparation cost, etc.

Active Publication Date: 2021-06-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-temperature ordering treatment will lead to agglomeration of catalyst nanoparticles, decrease in electrochemical specific surface area, and decrease in the utilization rate of platinum atoms, resulting in a decrease in catalyst activity; on the other hand, high-temperature treatment will lead to high energy consumption in the technical route and increase the production cost

Method used

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  • Platinum alloy nanocrystalline catalyst, and preparation method and application thereof
  • Platinum alloy nanocrystalline catalyst, and preparation method and application thereof
  • Platinum alloy nanocrystalline catalyst, and preparation method and application thereof

Examples

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preparation example Construction

[0029] The preparation method of the platinum alloy nanocrystal catalyst provided by the invention, the preparation method first synthesizes disordered face-centered cubic structure platinum-based alloy nanocrystal (hereinafter referred to as fcc-PtFe) by the method of organic phase synthesis, and then fcc-PtFe The nanocrystal is used as the positive electrode of the lithium-ion battery, and the metal lithium sheet is used as the negative electrode of the lithium-ion battery to assemble a complete lithium-ion battery. The charging and discharging process is carried out in the voltage range of 0-2.4V, and the lithium intercalation amount in the positive electrode nanocrystalline material is controlled by controlling the discharging time. The invention reduces the bonding strength between metal atoms in the alloy by electrochemically inserting lithium into PtFe, increases the number of vacancies in the nanocrystal, and reduces the activation energy of phase transition.

[0030] ...

Embodiment 1

[0041] see figure 1 , Embodiment 1 of the present invention comprises the following steps:

[0042] S1: Weigh 0.05mmol of platinum acetylacetonate and 0.05mmol of iron acetylacetonate and dissolve them in 5ml of oleylamine, and place the resulting solution under N 2 In the atmosphere, react at 300°C for 1h. The fcc-PtFe powder was subsequently washed by centrifugation, and the obtained powder was dissolved in n-hexane. Weigh 72 mg of carbon powder XC-72 and disperse it in a mixed solvent of n-hexane and ethanol for 0.5 h, then add the fcc-PtFe powder dispersed in n-hexane dropwise into the mixed solvent, and continue to sonicate for 1 h. Then the solvent was centrifugally washed and dried to obtain the fcc-PtFe alloy supported on XC-72.

[0043] S2: Weigh 24 mg of the final sample obtained in step S1 and 6 mg of sodium alginate into a mortar, drop in an appropriate amount of ultrapure water, and grind the powder evenly. The obtained slurry was coated on a flat copper foil, a...

Embodiment 2

[0046] The sample synthesis steps S1 and S2 in this example are the same as the steps S1 and S2 in Example 1.

[0047] S3: After step S2 is assembled, the button battery is in the potential window of 0-2.4V at 100mA g -1 The current density charge and discharge cycles 5 times, and then discharge at the same current density for 1.5h. The lithium-intercalated button battery is disassembled, and the positive electrode material of the battery is soaked in the polycarbonate solution for 12 hours, and the electrolyte remaining on the surface of the positive electrode material is washed away. Subsequently, the soaked positive electrode material was transferred to ultrapure water for ultrasonication for 2 minutes, at which point the positive electrode material had completely fallen off from the copper foil and was dispersed in the ultrapure water. Then, suction filtration, washing, and drying obtain the PtFe nanocrystals after lithium intercalation, and place the obtained nanocrystal...

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Abstract

The invention belongs to the related technical field of proton exchange membrane fuel cell cathode catalysts, and discloses a platinum alloy nanocrystalline catalyst, and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a carbon-supported nanocrystalline sample by using a mixed solution composed of a platinum source precursor, an iron source precursor and oleylamine as a raw material; (2) preparing a positive electrode of a lithium ion battery by taking the carbon-supported nanocrystalline sample as one of raw materials, and carrying out charging and discharging treatment on the formed lithium ion battery to obtain the lithium ion battery with a lithium-embedded positive electrode; and (3) disassembling the lithium ion battery to obtain a lithium-embedded positive electrode material, and treating the positive electrode material to obtain a phase-changed ordered platinum alloy nanocrystalline catalyst. According to the invention, electrochemical lithium intercalation is carried out on the platinum-based alloy nanocrystals in a charging and discharging mode of the assembled lithium battery so that the bonding strength among metal atoms in the alloy is reduced, and ordered transformation of the platinum-based alloy nanocrystals under a low-temperature condition is promoted.

Description

technical field [0001] The invention belongs to the technical field related to proton exchange membrane fuel cells, and more specifically relates to a platinum alloy nanocrystal catalyst and its preparation method and application, especially to the preparation of ordered intermetallic phase proton exchange membrane fuel cell cathode catalysts. Background technique [0002] With the rapid development of economy and society, the energy crisis and environmental problems have become increasingly prominent. Traditional fossil energy has problems such as environmental pollution and low energy utilization efficiency. It is imminent to develop green, clean and efficient new energy sources (such as solar energy, hydrogen energy, wind energy, etc.). Proton exchange membrane fuel cells (PEMFCs) are a new type of energy device that directly converts chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, low operating temperature, clean and gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/10H01M10/44H01M4/38B82Y30/00B82Y40/00
CPCH01M4/921H01M8/10H01M10/44H01M4/38B82Y30/00B82Y40/00Y02E60/10Y02E60/50
Inventor 李箐毛佳伦
Owner HUAZHONG UNIV OF SCI & TECH
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