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Preparation method for PtCu/C catalyst

A catalyst, sodium borohydride technology, is applied in the field of preparation of PtCu/C catalysts, which can solve the problems of easy agglomeration of PtCu nanoparticles and easy oxidation of Cu nanoparticles, and achieve the effects of preventing oxidation, preventing aggregation and improving performance.

Inactive Publication Date: 2014-08-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that Cu nanoparticles are easily oxidized and PtCu nanoparticles are easy to agglomerate in the existing method for preparing PtCu / C catalyst, and provide a kind of preparation method of PtCu / C catalyst

Method used

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  • Preparation method for PtCu/C catalyst
  • Preparation method for PtCu/C catalyst
  • Preparation method for PtCu/C catalyst

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preparation example Construction

[0027] The present invention provides a kind of preparation method of PtCu / C catalyst, comprising:

[0028] Step 1: mixing the copper source and the carbon carrier in the solution to obtain a suspension;

[0029] Step 2: Under the protection of argon, mix the suspension obtained in Step 1 with sodium borohydride, and then add citric acid solution to obtain a mixed solution;

[0030] Step 3: Mix the mixed solution obtained in Step 2 with a platinum source to obtain a PtCu / C catalyst.

[0031] According to the present invention, in step 1, the copper source and the carbon carrier are first mixed in the solution, the carbon carrier is first added to deionized water and stirred evenly, preferably dispersed by ultrasonic for 1-2h, and then the copper source is added to obtain Suspension; the carbon carrier is a carbon carrier well known to those skilled in the art, without special limitations, preferably activated carbon, carbon nanotubes or graphene, more preferably VulcanXC-72 o...

Embodiment 1

[0042] 1) Add 96mg of VulcanXC-72 into 120mL of deionized water, ultrasonically disperse for 1 hour, then add 24mL of 0.01MCuCl 2 aqueous solution to obtain a suspension;

[0043] 2) Bubble argon into the suspension in 1) for 1 hour to remove the oxygen in the solution, and then add 12 mL containing 18.64 mg of NaBH 4 The aqueous solution, let stand for 3h, then add 24mL0.005M citric acid aqueous solution (molar ratio CuCl 2 : citric acid=1:0.5), obtain mixed solution;

[0044] 3) Add 24mL of 0.005M H to the mixture in 2) 2 PtCl 6 For the aqueous solution, the temperature of the water bath was controlled at 30° C., and the stirring was continued for 12 hours. The obtained mixed solution was filtered, washed, and vacuum-dried at 60° C. to obtain a PtCu / C catalyst.

[0045] Add 5 mg of the above-mentioned PtCu / C catalyst to 50 μL of the Nafion solution produced by Ladrich with a mass concentration of 5%, and disperse it ultrasonically for 30 minutes to obtain a solution; tak...

Embodiment 2

[0047] 1) Add 96mg of VulcanXC-72 into 120mL of deionized water, ultrasonically disperse for 1 hour, then add 24mL of 0.01MCuCl 2 aqueous solution to obtain a suspension;

[0048] 2) Bubble argon into the suspension in 1) for 1 hour to remove the oxygen in the solution, and then add 12 mL containing 18.64 mg of NaBH 4 The aqueous solution was left to stand for 3h, and then 24mL of 0.01M citric acid aqueous solution (molar ratio CuCl2:citric acid=1:1) was added to obtain a mixed solution;

[0049] 3) Add 24mL of 0.005M H to the mixture in 2) 2 PtCl 6 For the aqueous solution, the temperature of the water bath was controlled at 30° C., and the stirring was continued for 12 hours. The obtained mixed solution was filtered, washed, and vacuum-dried at 60° C. to obtain the PtCu / C catalyst.

[0050] Add 5 mg of the above-mentioned PtCu / C catalyst to 50 μL of the Nafion solution produced by Ladrich with a mass concentration of 5%, and disperse it ultrasonically for 30 minutes to ob...

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Abstract

The invention provides a preparation method for a PtCu / C catalyst, and belongs to the field of preparation methods for noble metal catalysts. The method comprises the following steps of mixing a copper source and a carbon support in a solution to obtain a suspension; mixing the suspension and sodium borohydride, and adding a citric acid solution to obtain a mixed solution; and mixing the obtained mixed solution and a platinum source to obtain the PtCu / C catalyst. According to the method, the citric acid solution is added in the reaction process to prevent the aggregation of nanoparticles, and the concentration of nitric acid is controlled to control the degree of wrapping of the citric acid on the surfaces of the nanoparticles, so that the degree of dispersion of the PtCu nanoparticles is controlled, and the methanol electro-oxidation catalysis performance is improved; the PtCu nanoparticles are uniformly dispersed, and are free of the aggregation, and the cyclic voltammetry curve of the PtCu / C catalyst in a methanol solution shows that the peak current density reaches 1,211mAmg<-1>.

Description

technical field [0001] The invention belongs to the field of preparation methods of noble metal catalysts, and in particular relates to a preparation method of a PtCu / C catalyst. Background technique [0002] As a clean energy source, direct methanol fuel cells have great potential in portable electronic devices and vehicle power applications. Currently, Pt-based catalysts are the most effective anode catalysts for methanol fuel cells due to their unique catalytic properties. However, the expensive price of the noble metal Pt and its low catalytic activity for methanol electrooxidation at room temperature have become major obstacles to the commercialization of direct methanol fuel cells. In the current research, in order to improve the activity of methanol oxidation and reduce the loading of Pt, the alloy catalyst of Pt and another non-noble metal is commonly used or the Pt-based catalyst nanoparticles with certain morphology are prepared. [0003] In general, the particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 邢巍吕青李晨阳梁亮
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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