Preparation method of Pd@Pt core-shell structural catalyst for low-temperature fuel cell

A technology of fuel cell and core-shell structure, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Large-scale production and other issues, to achieve the effect of simple preparation process, high electrochemical specific surface area, high oxygen reduction catalytic activity

Inactive Publication Date: 2013-04-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this method is synthesized by electrochemical method, which requires special equipment and is not suitable for large-scale production.
Xia's research group (Lim, B., M.J. Jiang, et al. Pd-Pt Bimetallic Nanonodendrites with High Activity for Oxygen Reduction. Science, 2009, 324 (5932): 1302-1305.) first prepared Pd nanoparticl

Method used

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  • Preparation method of Pd@Pt core-shell structural catalyst for low-temperature fuel cell
  • Preparation method of Pd@Pt core-shell structural catalyst for low-temperature fuel cell
  • Preparation method of Pd@Pt core-shell structural catalyst for low-temperature fuel cell

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Experimental program
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Effect test

Embodiment 1

[0024] 1. Add a certain amount of PdCl to a one-necked flask 2 aqueous solution and K 2 PtCl 4 Aqueous solution, so that the concentration of the sum of Pd and Pt elements is 15.1mmol L -1 , the atomic ratio of Pd and Pt is 1:2, stir evenly.

[0025] 2. Add to the above solution P123, stirring, the mass fraction of P123 after complete dissolution is 0.5%.

[0026] 3. Add ascorbic acid to the above solution so that the ratio of ascorbic acid to the sum of Pd and Pt elements is 4.8:1, and stir at room temperature for 12 hours.

[0027] 4. Centrifuge after the reaction, and then wash several times. The obtained metal particles were dispersed in isopropanol for later use.

[0028] The TEM photo of the PdPt nanoparticles that the present embodiment obtains is as follows figure 1 shown.

Embodiment 2

[0030] 1. Add a certain amount of Na to the single-necked flask 2 PdCl 4 aqueous solution and H 2 PtCl 6 Aqueous solution, so that the concentration of the sum of Pd and Pt elements is 4.66mmol L -1 , the atomic ratio of Pd and Pt is 2:1, stir well.

[0031] 2. Add to the above solution F127, stir, the mass fraction of F127 after complete dissolution is 5%.

[0032] 3. Add ascorbic acid to the above solution so that the ratio of ascorbic acid to the sum of Pd and Pt elements is 15.6:1, and stir at room temperature for 12 hours.

[0033] 4. Centrifuge after the reaction, and then wash several times. The obtained metal particles were dispersed in isopropanol for later use.

[0034] The TEM photo of the PdPt nanoparticles that the present embodiment obtains is as follows figure 2 shown.

Embodiment 3

[0036] 1. Add a certain amount of Na to the single-necked flask 2 PdCl 4 aqueous solution and K 2 PtCl 4 Aqueous solution, so that the concentration of the sum of Pd and Pt elements is 4.66, 6.22, 7.77 and 9.33mmol L -1 , the corresponding atomic ratios of Pd and Pt are 2:1, 1:1, 2:3 and 1:2, and stir evenly.

[0037] 2. Add to the above solution F127, stir, the mass fraction of F127 after complete dissolution is 1%.

[0038] 3. Add ascorbic acid to the above solution so that the ratios of ascorbic acid to the sum of Pd and Pt elements are 15.6:1, 11.7:1, 9.4:1 and 7.8:1 respectively, and stir at room temperature for 12 hours.

[0039] 4. After the reaction, the reaction system was cooled to room temperature, then centrifuged and washed several times. The obtained metal particles were dispersed in isopropanol for later use.

[0040] The TEM photo of the PdPt nanoparticles that the present embodiment obtains is as follows image 3 As shown, the atomic ratio obtained by...

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Abstract

The invention provides a method for preparing core-shell structural nanometer metal particles. Spherical Pd nanoparticles are taken as a core; Pt nanodendrites are taken as a shell; and the nanometer metal particles can be taken as a low-temperature fuel cell catalyst. The preparation method comprises the following steps of: reducing precursors of Pd and Pt with ascorbic acid by taking deionized water as a solvent and taking a segmented copolymer as a protecting agent; and preparing nanoparticles according to different reducing sequences of the ascorbic acid on the Pd and Pt precursors, wherein the Pt shell has a nanometer dendritic crystal structure. A supported catalyst can be obtained by adding a carrier into nanoparticle sol obtained by reacting. The preparation method adopted by the invention has the advantages of easiness, environment friendliness, energy saving and the like. The prepared core-shell structural catalyst shows high area specific activity and unit mass Pt catalytic activity on an oxygen reduction reaction.

Description

technical field [0001] The invention relates to a core-shell structure nano catalyst, in particular to a preparation method of a low-temperature fuel cell cathode PdPt core-shell structure catalyst. Background technique [0002] With the increasing depletion of fossil energy, environmental pollution and climate change, clean energy has attracted great attention from all over the world. Proton exchange membrane fuel cells have the advantages of cleanliness, high efficiency, high power density, and low-temperature fast start-up, and are widely used in vehicle power supplies and distributed power generation. However, the commercialization of proton exchange membrane fuel cells faces the problem of high cost, in which the catalyst occupies a large proportion, because the catalyst uses Pt, and the resource of Pt is limited, so the price is high. In order to reduce the cost of fuel cells, the amount of Pt must be reduced, which requires an increase in the catalytic activity per u...

Claims

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Application Information

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IPC IPC(8): B01J23/44H01M4/92
CPCY02E60/50
Inventor 邵志刚张耕鲁望婷谢峰秦晓平衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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