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Method for preparing platinum/carbon nano electro catalyst by microwave synthesis

An electrocatalyst and microwave synthesis technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., to achieve energy-saving efficiency, good electrocatalytic performance, and wide application effects

Inactive Publication Date: 2006-05-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, adding sodium acetate solution as a stabilizer in the synthesis solution, and using microwave heating to synthesize platinum / carbon nanometer electrocatalysts has not been reported in the relevant literature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.002mol / L. Take 100 milliliters of this solution, then add 1.0 milliliters of 1mol / L sodium acetate solution, the concentration of sodium acetate in the synthesis solution is 0.01mol / L. Then, 160 mg of XC-72 nanocarbons were added to the synthesis solution, and treated with ultrasonic waves to make them evenly mixed. Finally, the homogeneous mixture was transferred to a 250 ml round bottom flask and placed in a microwave oven with a reflux device and microwaved for 2.5 minutes. After cooling, the solid product was filtered and fully washed with acetone and deionized water, and dried at 90°C to obtain a Pt / XC-72 nanometer electrocatalyst (the mass fraction of platinum was 20%). The platinum nanoparticles in the Pt / XC-72 nanometer electrocatalyst were observed by transmission electron microscope with a uniform particle size, and the average particle size was 2.8 nanometers.

...

Embodiment 2

[0019] Dissolve potassium chloroplatinate in ethylene glycol to prepare a solution with a concentration of 0.001mol / L. Get 100 milliliters of this solution, then add 0.6 milliliters of 1mol / L sodium acetate solution, the concentration of sodium acetate in the synthesis solution is 0.006mol / L. Then, 80 mg of multi-walled carbon nanotubes were added to the synthesis solution, and the mixture was uniformly mixed by ultrasonic treatment. Finally, the homogeneous mixture was transferred to a 250 ml round bottom flask and placed in a microwave oven with a reflux device and microwaved for 2.5 minutes. After cooling, the solid product was filtered and fully washed with acetone and deionized water, and dried at 90° C. to obtain a Pt / CNTs nanometer electrocatalyst (the mass fraction of platinum was 20%). The platinum nanoparticles in the Pt / MWCNTs nano-electrocatalyst were observed by transmission electron microscope with a uniform particle size, and the average particle size was 3.0 n...

Embodiment 3

[0023] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.001mol / L. Take 100 milliliters of this solution, then add 0.5 milliliters of 1mol / L sodium acetate solution, the concentration of sodium acetate in the synthesis solution is 0.005mol / L. Then, 80 mg of single-walled carbon nanotubes were added to the synthesis solution, and mixed uniformly by ultrasonic treatment. Finally, the homogeneous mixture was transferred to a 250 ml round bottom flask and placed in a microwave oven with a reflux device and microwaved for 2.5 minutes. After cooling, the solid product was filtered and fully washed with acetone and deionized water, and dried at 90°C to obtain a Pt / SWCNTs nanometer electrocatalyst (the mass fraction of platinum was 20%). The particle size of the platinum nanoparticles in the Pt / SWCNTs nano-electrocatalyst was observed by the transmission electron microscope, and the average particle size was 3.1 nm.

[0024] As a compari...

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Abstract

The present invention discloses a preparation method for synthesizing platinum-carbon nano electric catalyst by utilizing microwave. Said method includes the following steps: dissolving platinum salt in glycol solution, the concentration of platinum salt in the solution is 0.001-0.08 mol / L, adding acetic acid solution as stabilizing agent, the concentration of sodium acetate in the synthetic solution is 0.005-0.03 mol / L, adding nano carbon carrier, utilizing ultrasonic treatment process to make nano carbon material be fully dispersed in the solution to obtain uniform mixture, heating said mixture in microwave oven, filtering washing and drying so as to obtain the platinum-carbon nano electric catalyst whose mass percentage of platinum is 10-40%. Said invention has extensive application in fuel cell.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a preparation method of microwave-synthesized platinum / carbon nanometer electrocatalyst. Background technique [0002] Platinum / carbon materials with carbon-supported platinum metal nanoparticles have been widely used as catalysts in chemical engineering, especially as electrocatalysts in fuel cells, due to their excellent catalytic properties. However, the traditional preparation method of this carbon-supported platinum metal nanoparticle catalyst is mainly based on the impregnation-reduction technique, that is, the carbon support is first impregnated in a solution containing a metal salt, so that the metal salt is adsorbed on the surface of the carbon support, and then it is reduced. High temperature reduction in neutral atmosphere. However, this traditional impregnation-reduction method is difficult to control the size of platinum metal particles loaded on the carbon ...

Claims

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Application Information

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IPC IPC(8): B01J37/34B01J23/42B01J32/00
Inventor 陈卫祥赵杰李翔俞贵艳
Owner ZHEJIANG UNIV
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