Microparticle-supported carbon particle, method for production thereof, and fuel cell electrode

A manufacturing method and technology of microparticles, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as the reduction of catalytic ability, and achieve the effect of reducing usage

Inactive Publication Date: 2008-09-24
HITACHI MAXELL ENERGY LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, conventional electrode catalysts for fuel cells using metal platinum particles cannot completely prevent the deterioration caused by CO poisoning of the metal platinum particles during use or the mutual adhesion of platinum particles caused by repeated exposure to a temperature atmosphere above 100°C. grows up, so there is a problem that its catalytic ability is significantly reduced

Method used

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  • Microparticle-supported carbon particle, method for production thereof, and fuel cell electrode
  • Microparticle-supported carbon particle, method for production thereof, and fuel cell electrode
  • Microparticle-supported carbon particle, method for production thereof, and fuel cell electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058]

[0059] 2.53 g of cerium chloride heptahydrate was dissolved in 100 ml of water, and 3 equivalents of citric acid were added to cerium to prepare an aqueous solution containing cerium-containing citric acid coordination ions. 5 g of Bulkan XC-72 (registered trademark, carbon black manufactured by CABOT, with an average particle size of 30 nm) was added to the aqueous solution and dispersed by ultrasonic waves, followed by stirring for 2 hours to adsorb the coordination ions on the surface of the Bulkan. Thereafter, hydrothermal treatment was performed at 180°C for 5 hours, and drying was performed at 90°C to obtain carbon particles carrying a cerium compound.

[0060] Next, 0.19 g of chloroplatinic acid hexahydrate was dissolved in 30 g of ethanol to prepare an ethanol solution of platinum. The ethanol solution was impregnated into the previously obtained cerium compound-carrying carbon particles (powder), and after drying at 60°C, the carbon particles were heat-treated in ...

Embodiment 2

[0063]

[0064] Dissolve 1.44 g of cerium chloride heptahydrate and 1.33 g of chloroplatinic acid hexahydrate in 100 ml of water, and add equivalent citric acid to the cerium ion and platinum ion to prepare an aqueous solution containing cerium and platinum citric acid coordination ions.

[0065] Next, 5 g of Bulkan XC-72 (registered trademark, carbon black manufactured by CABOT, with an average particle size of 30 nm) was impregnated with an aqueous solution containing the above-mentioned citric acid coordination ions, and the above-mentioned coordination ions were adsorbed on the surface of the above-mentioned Bulkan. After drying at 90°C, heating treatment was performed at 700°C in nitrogen to obtain platinum-substituted cerium oxide (Ce 0.6 Pt 0.4 )O 2 Particles of carbon particles.

[0066] For the support (Ce 0.6 Pt 0.4 )O 2 Powder X-ray diffraction spectroscopy was performed on the carbon particles of, and the results confirmed that although the peak position shift caused ...

Embodiment 3

[0069]

[0070] In the method for producing fine particle-carrying carbon particles of Example 1, after obtaining cerium compound-carrying carbon particles in the same manner as in Example 1, 0.09 g of ruthenium chloride trihydrate was dissolved in 30 g of water to make the ruthenium aqueous solution The above-mentioned carbon particles supporting the cerium compound were impregnated, except that the same operation as in Example 1 was carried out to obtain ruthenium-substituted cerium oxide particles (Ce 0.95 Ru 0.05 )O 2 Of carbon particles.

[0071] For the support prepared in this way (Ce 0.95 Ru 0.05 )O 2 The result of powder X-ray diffraction spectrum measurement of the carbon particles of, it was confirmed that a clear single-phase peak of the cerium oxide structure appeared as in Example 1. It can be seen that the ruthenium element enters the crystal lattice of the cerium oxide. At this time, the average crystallite size calculated from the half-value width of the diffract...

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Abstract

Disclosed is a microparticle-supported carbon particle which can be used as an alternative to a platinum-supported carbon particle or a metal platinum particle which is currently used as a catalyst for a fuel cell electrode or the like and in which the amount of platinum used is largely reduced compared to that in a conventional platinum-supported carbon particle or the like. Also disclosed is an electrode for a fuel cell, which is manufactured using the microparticle-supported carbon particle. The microparticle-supported carbon particle comprises a carbon particle having an average particle diameter of 20 to 70 nm and a metal oxide microparticle supported on the carbon particle, wherein the metal oxide microparticle has an average crystallite diameter ranging from 1 to 20 nm and contains a noble metal element such as platinum element (the metal oxide microparticle is represented by the general formula: MOx, and the metal element (M) in the metal oxide microparticle is partly substituted by a noble metal element). The microparticle-supported carbon particle can be produced by a method comprising the steps of preparing a solution containing a complex ion of a metal constituting the metal oxide microparticle, dispersing a carbon particle in the solution to cause the adsorption of the complex ion onto the carbon particle, and performing hydrothermal treatment.

Description

Technical field [0001] The requirements for this patent application are based on the Japanese Patent Application No. 2005-277022 (filed on September 26, 2005, the title of the invention: "Carbon particles carrying fine particles and their manufacturing method") and Japanese Patent Application No. 2005-277024 ( Filed on September 26, 2005, the title of the invention: "Carbon particles carrying fine particles and a method for producing the same") is a priority based on the Paris Treaty. By citation here, all the contents described in the above application constitute a part of this specification. [0002] The present invention relates to fine-particle-carrying carbon particles, a method for producing the same, and a fuel cell electrode. More specifically, the present invention relates to fine-particle-carrying carbon particles supporting metal oxide fine particles containing noble metal elements in a crystal lattice and the same Manufacturing methods, etc. Background technique [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/42H01M4/90
CPCY02E60/50
Inventor 泽木裕子佐藤吉宣岸本干雄中西治通今西雅弘
Owner HITACHI MAXELL ENERGY LTD
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