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Method for preparing carbon-supported nano Pt-M fuel cell catalyst

A fuel cell and catalyst technology, applied in the field of catalysis, can solve the problems of low adsorption rate, difficult control of particle and dispersion, and high platinum loading

Active Publication Date: 2010-12-15
CHENZHOU GAOXIN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing carbon-supported nano-Pt-M fuel cell catalysts, which solves the defects of electrocatalysts such as difficult control of particles and dispersion, high platinum loading, low adsorption rate and agglomeration using traditional preparation methods , and has the advantages of simple process, green environmental protection, relatively cheap catalyst, strong resistance to CO poisoning, high dispersion, small particle size, good catalytic performance, etc.

Method used

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  • Method for preparing carbon-supported nano Pt-M fuel cell catalyst
  • Method for preparing carbon-supported nano Pt-M fuel cell catalyst
  • Method for preparing carbon-supported nano Pt-M fuel cell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The 19.5gPt and 10.1gRu Add one or two of methanol, ethanol, propylene glycol, glycerol, ethylene glycol, and polyvinyl alcohol to dissolve and combine to ensure that the metal concentration is between 1-15mol / L, and then add 0.02-0.8mol of phosphoric acid or lemon acid, at a temperature of 25–60 Ultrasonic 10–20min under the condition; add to 118.4g -5–20 In the carrier carbon, at -5–20 Stir and adsorb for 24–36 hours, dehydrate to constant weight by microwave; add deionized water to slurry, add 29.6–592 mL of methanol, formaldehyde, formic acid, sodium borohydride, and hydrazine hydrate with a concentration of 0.01–5 mol / L under stirring One or both solutions are reduced and warmed to 50–100 ; Filtration, washing the catalyst repeatedly with deionized water, after 80–110 Microwave dehydration and drying to obtain a loading of 20wt% electrocatalyst.

[0026] figure 1 The transmission electron microscope (TEM) photo of the Pt-Ru alloy nanoparticles prepa...

Embodiment 2

[0029] The 19.5gPt and 5.3gPd Add one or two of methanol, ethanol, propylene glycol, glycerol, ethylene glycol, and polyvinyl alcohol to dissolve and combine to ensure that the metal concentration is between 1-15mol / L, and add 0.015-0.6mol of phosphoric acid or lemon acid, at a temperature of 25–60 Ultrasonic 10–20min under the condition; add to 99.2g -5–20 In the carrier carbon, at -5–20 Stir and adsorb for 24–36 hours, dehydrate to constant weight by microwave; after adding deionized water to slurry, add 24.8–496 mL of methanol, formaldehyde, formic acid, sodium borohydride, and hydrazine hydrate with a concentration of 0.01–5 mol / L under stirring One or both solutions are reduced and warmed to 50–100 ; Filtration, washing the catalyst repeatedly with deionized water, after 80–110 Microwave dehydration and drying to obtain a loading of 20wt% electrocatalyst.

[0030] The average particle size of the Pt-Pd alloy nanoparticles prepared in this example is 2.2nm, ...

Embodiment 3

[0033] The 19.5gPt and of Add one or two of methanol, ethanol, propylene glycol, glycerol, ethylene glycol, and polyvinyl alcohol to dissolve and combine to ensure that the metal concentration is between 1-15mol / L, and then add 0.02-0.8mol of phosphoric acid or lemon acid, at a temperature of 25–60 Ultrasonic 10–20min under the condition; add to 101.2g -5–20 In the carrier carbon, at -5–20 Stir and adsorb for 24–36 hours, dehydrate to constant weight by microwave; add deionized water to slurry, add 25.3–506 mL of methanol, formaldehyde, formic acid, sodium borohydride, and hydrazine hydrate with a concentration of 0.01–5 mol / L under stirring One or both solutions are reduced and warmed to -50–100 ; Filtration, washing the catalyst repeatedly with deionized water, after 80–110 Microwave dehydration and drying to obtain a loading of 20wt% electrocatalyst.

[0034] Prepared in this example The average particle size of the alloy nanoparticles is 1.9nm, the dispe...

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Abstract

The invention provides a method for preparing a carbon-supported nano Pt-M fuel cell catalyst. The method comprises the following steps of: (1) dissolving H2PtCl6.6H2O and an M compound with alcohol respectively, combining the dissolved H2PtCl6.6H2O and M compound and ultrasonically processing the mixture for 10 to 20 minutes at the temperature of between 25 and 60 DEG C; (2) performing dry-dipping on a Pt-M active precursor prepared in the step (1) on a carbon support and dehydrating the carbon support with microwave to a constant weight; (3) adding water into the carbon support obtained by the step (2) for pasting and adding a reducing agent into the carbon support for reduction; and (4) filtering, washing and dehydrating the obtained product with microwave to obtain a Pt-M / C catalyst. The nano Pt-M binary alloy fuel cell catalyst prepared by the method of the invention solves the problems of difficult control over graininess and dispersion degree, high platinum load, low adsorption rate, agglomeration and the like existing in the conventional method for preparing an electro-catalyst and has the advantages of simple process, environmental friendliness, relatively low cost, high anti-CO poisoning capacity, high dispersion degree, small grain size, high catalytic performance and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of a carbon-supported nanometer Pt-M fuel cell catalyst. Background technique [0002] Fuel cell is one of the most important new energy technologies in the 21st century. It has the advantages of low operating temperature, fast start-up, high energy conversion efficiency, and no pollution. A large number of researches are being carried out at home and abroad. [0003] So far, effective catalysts for cathodes and anodes of low-temperature fuel cells are still dominated by platinum. Due to the high price of platinum and the scarcity of resources, the cost of low-temperature fuel cells is very high, which greatly limits its wide application. In this way, reducing the amount of noble metal catalysts, seeking cheap catalysts, and improving the performance of electrode catalysts have become the main goals of electrode catalyst research. The developm...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/44B01J23/89B01J23/652B01J23/52B01J23/62H01M4/92
CPCY02E60/50
Inventor 杨拥军雷涤尘刘汉范叶咏祥邓春玲杨静
Owner CHENZHOU GAOXIN MATERIAL
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