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Catalyst for fuel cell and method for preparing the same

A fuel cell electrode and catalyst technology, which is applied in the direction of catalyst activation/preparation, fuel cells, chemical instruments and methods, etc., can solve the problems of reduced oxidation resistance and oxidation resistance that is not superior to activated carbon materials, and achieve improved performance. Effect

Active Publication Date: 2012-02-08
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the edge of the base surface is exposed to the surface, the oxidation resistance is reduced
Therefore, these materials do not exhibit better oxidation resistance than activated carbon materials depending on the environment

Method used

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  • Catalyst for fuel cell and method for preparing the same
  • Catalyst for fuel cell and method for preparing the same
  • Catalyst for fuel cell and method for preparing the same

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Experimental program
Comparison scheme
Effect test

Embodiment

[0071] Based on the method of preparing fuel cell catalysts and electrodes, linear crystalline carbon nanofibers and spherical crystalline carbon particles are mixed in a ratio of 20:80 wt% to 80:20 wt%, for example, in a ratio of 1:1.

[0072] Additionally, supported catalysts were prepared using 50% by weight crystalline carbon support and 50% by weight catalyst metal support.

[0073]Supported catalysts contain both platinum catalysts and transition metal-containing platinum alloy catalysts.

[0074] The preparation of the supported catalyst will be described in detail below.

[0075] As the first carbon carrier, sheet-like or herringbone-like linear crystalline carbon nanofibers with a fiber diameter of 30 to 200 nm are used.

[0076] The linear crystalline carbon nanofibers are heat-treated at 2200˜2800° C. under an argon atmosphere, and the heat-treated linear crystalline carbon nanofibers are ground and dispersed in ethylene glycol.

[0077] Linear crystalline carbon ...

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PUM

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Abstract

The present invention provides a method for preparing a catalyst for a fuel cell, and the catalyst for the fuel cell prepared via the method. The preparation method includes the following steps: heat-treating linear crystalline carbon nanofibers at a suitable temperature, about 2000 to 2800 DEG C, in an inert gas atmosphere to thereby improve oxidation resistance due to an improvement in crystallinity; heat-treating spherical crystalline carbon particles at a suitable temperature, about 1000 to 1500 DEG C, to thereby increase the surface area; individually dispersing the different types of carbon materials in an alcohol, such as ethylene glycol, respectively; mixing the different types of carbon supports in a predetermined mixing ratio to form a slurry; and preparing a platinum-supported catalyst or a platinum alloy-supported catalyst by adding NaOH, a platinum precursor or a platinum alloy precursor, and the different types of carbon materials to a solvent for catalyst synthesis, and refluxing the mixture at a suitable temperature, about 140 to 180 DEG C, to reduce the alloy precursor or the platinum alloy precursor.

Description

technical field [0001] The present invention generally relates to a fuel cell catalyst and a preparation method thereof. More particularly, it relates to a method of preparing a catalyst for fuel cell electrodes by using various kinds of crystalline carbon materials, and a catalyst for fuel cells prepared by this method. Background technique [0002] Generally, a fuel cell is a device that converts chemical energy of a fuel such as hydrogen into electrical energy. Since the theoretical efficiency of fuel cells is close to 100% and typically reaches high levels of 80-50%, many studies have focused on more efficient use of fuel cells and renewable energy in the form of hydrogen, especially as resources become more scarce. [0003] The operation of fuel cells is based on electrochemical reactions involving electron transfer, and it is important to induce reactions that can reduce the overvoltage to minimize the polarization at the equilibrium potential at the same rate as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/89H01M4/92H01M4/90
CPCY02E60/50B01J23/42H01M4/921H01M4/8882B01J35/06H01M2008/1095B01J37/04H01M4/926B01J23/44B01J23/8913B01J23/892B01J37/0036B01J23/825Y10S977/775
Inventor 卢范旭李起燮
Owner HYUNDAI MOTOR CO LTD