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Nucleocapsid catalyst in use for fuel cell and preparation method

A core-shell catalyst and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as high equipment requirements, not suitable for mass production, and limited number of functional groups

Inactive Publication Date: 2006-12-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited number of negatively charged functional groups introduced on the carbon surface, it is difficult to achieve a platinum loading of more than 5%.
[0007] Wu Shihua et al., Petrochemical Industry, 187: 361 introduced vacuum sputtering and metal vapor deposition methods to prepare catalysts, but these two methods have very high equipment requirements and are not suitable for mass production

Method used

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  • Nucleocapsid catalyst in use for fuel cell and preparation method
  • Nucleocapsid catalyst in use for fuel cell and preparation method
  • Nucleocapsid catalyst in use for fuel cell and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Take 500 ml of 0.05 mol / liter polydiallyldimethylammonium chloride, add 500 ml of 0.02 mol / liter nickel chloride solution, and stir for 3 minutes with an electric motor at a speed of 300 rpm. Add 0.1 mol / L NaBH 4 15 ml, stirred for 5 minutes, and passed through H 2 Protect. Add 0.01 mol / L H 2 PtCl 6 100 ml of the solution was stirred electrically for 1 hour at 500 rpm. Add 0.29 g of VulcanXC-72 carbon powder, electric stirring for 15 hours at 5000 rpm, filter and rinse with deionized water for 5 times, and vacuum dry at 80°C. The mass ratio of carbon to platinum in the prepared carbon-supported [nickel] (platinum) catalyst (the elements in the square brackets represent the core of the core-shell structure, and the elements in the brackets represent the shell of the core-shell structure) is 3:2. The transmission electron microscope image of the catalyst is shown in figure 2 .

Embodiment 2

[0041] Take 500 ml of 0.02 mol / L sodium citrate, add 500 ml of 0.01 mol / L cobalt chloride solution, and stir electrically for 5 minutes at a speed of 500 rpm. Add 0.1 mol / L NaBH 4 15 ml, stirred for 5 minutes, and passed through H 2 Protect. Add 0.01 mol / L H 2 PtCl 6 The solution was 100 ml, stirred by electric motor for 1 hour at 500 rpm, filtered and rinsed with deionized water 5 times, and dried under vacuum at 60°C. The prepared [cobalt] (platinum) catalyst. The transmission electron microscope image of the catalyst is shown in image 3

Embodiment 3

[0043] Take 500 ml of 0.04 mol / L sodium dodecylsulfonate solution, add 500 ml of 0.01 mol / L ferric sulfate solution, and stir for 4 minutes with a rotating speed of 400 rpm. Add 0.1 mol / L N 2 H 2 ·H 2 O40 ml, stirred for 5 minutes, and passed into H 2 Protect. Add 0.01 mol / L RuCl 3 100 ml of the solution was stirred electrically for 1 hour at 500 rpm. Add 0.404 g of VulcanXC-72 carbon powder, electric stirring for 15 hours at 5000 rpm, filter and rinse with deionized water for 5 times, and vacuum dry at 80°C. The mass ratio of carbon to ruthenium in the prepared carbon-supported [iron] (ruthenium) catalyst is 4:1.

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Abstract

A core-shell catalyst with controllable granularity and thickness of catalyzing layer and high active specific surface area and catalytic efficiency for fuel battery is prepared through preparing the nanoparticles of the metal with low standard electrode potential, and using it to displace out the metal with high standard electrode potential to cover on the surface of said nanoparticle.

Description

technical field [0001] The invention belongs to a core-shell catalyst for a fuel cell and a preparation method thereof Background technique [0002] Nano-sized unsupported metal particles are prone to agglomeration, resulting in a decrease in specific surface area. Therefore, catalysts used in fuel cells are generally supported noble metal catalysts, such as carbon-supported platinum, ruthenium, and the like. Due to the scarcity and high price of these noble metal resources, it is necessary to adopt appropriate preparation methods and production processes to reduce the particle size of the catalyst, make its particle size distribution uniform, and increase the dispersion of the catalyst to prevent catalyst agglomeration, thereby improving the activity and performance of the catalyst. utilization rate. Many researchers at home and abroad have tried various methods to prepare supported noble metal catalysts. [0003] US3,992,331 introduces a method for preparing a highly di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00B01J23/00H01M4/90
CPCY02E60/50
Inventor 唐浩林宛朝辉潘牧袁润章
Owner WUHAN UNIV OF TECH
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