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Preparation method for loading platinum nanoparticles on carbon carrier

A nanoparticle, carbon carrier technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of metal nanoparticles being difficult to directly load, and achieve simple efficiency Effect

Inactive Publication Date: 2005-11-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymer-protected metal nanoparticles obtained by this method are difficult to directly support on carbon supports.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] 0.16 g of commercial XC-72 nanocarbons were uniformly dispersed in 100 ml of ethylene glycol solution containing 0.002 mol of chloroplatinic acid, and 0, 0.25, 0.5 and 0.7 ml of 1 mol / L sodium acetate were added The solution was then heated to 170°C and refluxed for 3 hours. The final product is obtained after filtration and extensive washing. The loading of platinum metal nanoparticles on carbon was 20%. The observation result of transmission electron microscope shows: do not add sodium acetate and add 0.25, 0.5 and 0.7 milliliters of sodium acetate solution of 1 mol / liter in the synthesis solution, and the average particle diameter of the platinum metal particles supported on the XC-72 nano-carbon They are 4.5, 3.4, 3.1 and 2.9nm respectively.

Embodiment 2

[0010] 0.12 grams of commercialized XC-72 nanometer carbons were uniformly dispersed in 100 milliliters of ethylene glycol solution containing 0.004 moles of chloroplatinic acid, and 0, 0.5 and 1.0 milliliters of 1 moles / liter of sodium acetate solution were added, It was then heated to 175°C and refluxed for 3 hours. The final product is obtained after filtration and extensive washing. The loading of platinum metal nanoparticles on carbon was 40%. Transmission electron microscope observation result shows: in synthetic solution, do not add sodium acetate and add the sodium acetate solution of 1 mol / liter of 0.5 and 1.0 milliliters to obtain, the average particle size of the platinum metal particle loaded on XC-72 nanometer carbon is respectively 5.9, 3.7 and 3.0nm.

Embodiment 3

[0012] 0.18 grams of carbon nanotubes were uniformly dispersed in 100 milliliters of ethylene glycol solution containing 0.001 mole of potassium chloroplatinate, and 0 and 0.5 milliliters of 1 mole / liter of sodium acetate solution were added, then heated to 170 ° C, and reflux for 3 hours. The final product is obtained after filtration and extensive washing. The loading of platinum metal nanoparticles on carbon was 10%. The transmission electron microscope observation results show that: the average particle diameters of the platinum metal particles loaded on the carbon nanotubes obtained without adding sodium acetate and adding 0.5 milliliters of 1 mol / liter sodium acetate solution in the synthesis solution are 3.9 and 2.8 nm respectively .

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Abstract

This invention discloses a method for loading platinum metal nanometer particles in the carbon carrier surface, which comprises the following steps: a) scattering carbon carrier on the polyatomic alcohol liquid with platinum metal salt and acetate; b) heating to 160-180 Deg.c, stirring and refluxing 2-3 hours; wherein each liter liquid has 1.2-15 g carbon carrier, 0.01-0.04 mole metal salt, 0-0.01 mole acetate. The loading quantity of platinum metal nanometer particles in the carbon carrier surface is 2%-40%. The particles have fine and even grain size, and the average size is about 3.0nm; besides, the method does not need any surface activator or polyaromatics protecting agent.

Description

technical field [0001] The invention relates to the preparation of nanometer metal particles, in particular to a preparation method for loading platinum metal nanoparticles on a carbon carrier, and belongs to the technical field of catalyst preparation and the field of electrocatalysts for fuel cells. Background technique [0002] Carbon-supported platinum metal nanoparticles have been widely used as heterogeneous catalysts in chemical engineering and fuel cell electrocatalysts 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 dif...

Claims

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Application Information

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IPC IPC(8): B01J37/02
Inventor 陈卫祥俞贵艳赵杰
Owner ZHEJIANG UNIV
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