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One-dimensional porous platinum-containing alloy nanowire catalyst and preparation method thereof

A technology of platinum nanowires and platinum alloys, applied in the field of electrocatalysis, can solve the problems of undiscovered one-dimensional porous platinum-based alloy nanowires, complex catalyst preparation technology, unfavorable catalyst use cost, etc., and achieve excellent cycle stability, excellent oxygen Reduction activity, simple and efficient synthesis method

Inactive Publication Date: 2020-08-07
HUAZHONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

However, there are still a large amount of noble metal platinum distributed inside these one-dimensional platinum alloy catalysts, which leads to low utilization of platinum, which is not conducive to reducing the cost of catalysts.
[0004] All in all, although people have made a lot of efforts in using hollow or one-dimensional platinum alloy catalysts to apply oxygen reduction in various energy conversion technologies, the existing catalysts still have complex preparation techniques, poor catalyst stability, and are not conducive to industrial production. question
In addition, in the current existing technologies and patents, there is no relevant report on the use of one-dimensional porous platinum-based alloy nanowires for actual fuel cell single cell testing.

Method used

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  • One-dimensional porous platinum-containing alloy nanowire catalyst and preparation method thereof
  • One-dimensional porous platinum-containing alloy nanowire catalyst and preparation method thereof
  • One-dimensional porous platinum-containing alloy nanowire catalyst and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing a one-dimensional porous low-platinum nanowire, comprising the following steps:

[0036] (1) Preparation of one-dimensional platinum-containing alloy nanowires: dissolving platinum metal salt and one or more transition metal salts in a solvent to obtain a precursor solution, and mixing the precursor solution with a surfactant and a reducing agent in Mixing under stirring conditions, oxidation-reduction reaction occurs at a certain temperature, and one-dimensional platinum-containing alloy nanowires are synthesized; under the action of a reducing agent, the platinum metal salt and transition metal salt are reduced to platinum and transition metal alloys. Under the guiding effect of , one-dimensional platinum-containing alloy nanowires are obtained.

[0037] (2) Preparation of one-dimensional porous platinum-containing alloy nanowires: the one-dimensional platinum-containing alloy nanowires obtained in step (1) are etched to r...

Embodiment 1

[0056] One is a porous platinum-containing alloy nanowire, which is a one-dimensional porous binary Pt3 Ni 2 The nanowire, wherein the platinum content is 83.3%, is obtained according to the following preparation method:

[0057] (1) Preparation of one-dimensional solid platinum alloy nanowires

[0058] In a fume hood, take a 100 ml beaker and put platinum acetylacetonate (Pt(acac) 2 ,10mg), nickel acetylacetonate (Ni(acac) 2 , 4.84mg) and dodecyltrimethylammonium bromide (CTAB, 100mg) were added to 10mL oleylamine solution, mixed and stirred evenly, and ultrasonicated for 2 hours to prepare a light yellow transparent solution. The above solution was transferred to a 50 ml flask, heated in an oil bath, and the temperature of the oil bath was raised to 180° C. within 30 minutes, kept at this temperature for 3 hours, and cooled naturally. The reactant was centrifuged, 10000 rpm / centrifugation for 5 minutes, the reactant was washed with a mixed solution of cyclohexane / absolute...

Embodiment 2

[0067] One-dimensional porous ternary Pt 3 Ni 2 PD 0.5 Nanowires, with a platinum content of 77.4%, which are used as catalysts for electrode materials. Prepared as follows:

[0068] Except that palladium acetylacetonate (2.35 mg) was added during the above synthesis process, other preparation and testing methods were completely the same as in Example 1. In the supported alloy nanowires, the loading amount of the alloy nanowire catalyst on the carrier was 22%. The loading capacity of platinum in the electrode material prepared in the embodiment is 21.6 μg / cm 2 . The oxygen reduction performance of the catalyst obtained in this example is 6.8 times that of the commercial Pt / C catalyst.

[0069] image 3 For the one-dimensional hollow ternary Pt obtained in embodiment 2 3 Ni 2 PD 0.5 TEM and HRTEM images of alloy nanowires. It can be seen that the one-dimensional hollow ternary Pt 3 Ni 2 PD 0.5 The alloy nano wire is composed of a nano wire and several hollow sphere...

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Abstract

The invention belongs to the field of electrocatalysis, and particularly relates to a one-dimensional porous low-platinum nanowire catalyst capable of being applied to oxygen reduction reactions in various energy conversion technologies, and a preparation method thereof. The preparation method comprises the following steps: dissolving a platinum metal salt and a salt of another one or more transition metals in a solvent, adding a surfactant and a reducing agent, and reacting at a certain temperature to prepare a platinum alloy nanowire with one-dimensional structural morphology; and then preparing the one-dimensional porous platinum-containing alloy nanowire by adopting an acid corrosion mode. The catalyst has a one-dimensional nanowire and a porous structure, has relatively high oxygen reduction catalytic activity and stability, and can be applied to oxygen reduction catalysts in various energy conversion devices. The method has the characteristics of high yield, simple synthesis process, high catalytic activity and the like, is suitable for large-scale industrial production, and has important significance for promoting the commercialization process of various energy conversion devices.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and more specifically relates to a one-dimensional porous low-platinum nanowire catalyst applicable to oxygen reduction reactions in various energy conversion technologies and a preparation method thereof. Background technique [0002] With the rapid development of economy and society, people are facing energy shortage and environmental problems are becoming more and more severe, so it is imperative to develop green energy and explore new energy conversion technologies. The oxygen reduction reaction is the core reaction of many electrochemical energy technologies, especially proton exchange membrane fuel cells and metal-air batteries. Due to the sluggish kinetics of the oxygen reduction reaction, the currently widely used catalysts still use the expensive and scarce precious metal platinum as the main active component. The resulting high cost of the catalyst has become a constraint for fuel cells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/92B82Y40/00
CPCB82Y40/00H01M4/861H01M4/8882H01M4/921Y02E60/50
Inventor 夏宝玉田新龙
Owner HUAZHONG UNIV OF SCI & TECH
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