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Proton conducter modified fuel cell catalyst using conductive ceramics as carrier and its preparation

A technology of fuel cells and conductive ceramics, which is applied in the direction of catalyst activation/preparation, catalyst carrier, catalyst protection, etc., to achieve the effects of improving utilization rate, improving corrosion resistance, and improving durability

Inactive Publication Date: 2008-08-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the use of proton-conducting polymers to modify conductive ceramics as catalyst supports for fuel cells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 116 mg of TiB 2 Conductive ceramic particles, particle size 10 nanometers to 50 nanometers, purity greater than 95%, added to 20 ml of a mixed solution of absolute ethanol and water, the mass ratio of absolute ethanol and water is 1:1, ultrasonic (R-S150 Ultrasonic cell pulverizer) was dispersed for 5 minutes, then it was added to 240 milliliters of alcohol water (the mass ratio of absolute ethanol and water was 1:1) mixed solution, and 4 milliliters of mass concentration 5% was added in the mixed solution Perfluorosulfonic acid resin solution, stirred for 20 minutes, added 4 g / L H 2 PtCl 6 40 ml, adjust pH=8 with NaOH, heat and reflux at 100°C for 20 minutes, wash and dry to obtain the Pt / TiB of the present invention 2 catalyst. The average particle size of the Pt catalyst is 2 nm.

[0031] Preparation of the fuel cell core chip CCM: add the prepared catalyst into a certain amount of deionized water and a 5% perfluorosulfonic acid resin solution, stir well, and...

Embodiment 2

[0034] Get 116 mg of TiC conductive ceramic particles with a particle size of 50-100 nanometers and a purity greater than 92%, add it to a mixed solution of 20 ml of isopropanol and water, the mass ratio of isopropanol and water is 1:1, and ultrasonically (R -S150 Ultrasonic Cell Pulverizer) was dispersed for 10 minutes, then it was added to the mixed solution of 240 milliliters of isopropanol and water, the mass ratio of isopropanol and water was 1:1, and then 4 milliliters of mass concentration 5 was added to the mixed solution. % sulfonated polyphenylene sulfide resin solution, stirred for 60 minutes, added 4 g / L H 2 PtCl 6 40 ml, adjust pH=10 with NaOH, heat and reflux at 100° C. for 10 minutes, wash and dry to obtain the Pt / TiC catalyst of the present invention. The average particle size of the Pt catalyst is 3 nanometers. The preparation process of the fuel cell core chip CCM, single cell assembly and testing conditions are the same as in Example 1, and the catalyst pr...

Embodiment 3

[0036] Take 116 mg of BaPbO 3 Conductive ceramic particles, particle size 100-120 nanometers, purity greater than 90%, added to 20 ml of methanol and water mixed solution, the mass ratio of methanol and water is 100:1, ultrasonic (R-S150 ultrasonic cell pulverizer) Disperse for 6 minutes, then add it to the mixed solution of 240 milliliters of methanol and water, the mass ratio of methanol and water is 100:1, then add 4 milliliters of sulfonated polyimide resin with a mass concentration of 5% in the mixed solution solution, stirred for 30 minutes, added 4 g / L H 2 PtCl 6 40 ml, adjust pH=9 with NaOH, heat and reflux at 100°C for 25 minutes, wash and dry to obtain Pt / BaPbO according to the present invention 3 catalyst. The average particle size of the Pt catalyst is 4.5 nanometers. The preparation process of the fuel cell core chip CCM, single cell assembly and test conditions are the same as in Example 1, and the catalyst prepared in this example is used. Test results show...

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PUM

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Abstract

The invention relates to a fuel battery catalyst which uses proton conductor to decorate conductive ceramic as carrier. Wherein, the carrier of catalyst is the conductive ceramic decorated by proton polymer; compared with traditional carbon carried catalyst, the invention has the advantages that (1) it has better conductive property and corrosion resistance; (2) the conductive ceramic has less surface porous and the expensive metal particle can be anchored on the surface of carrier, to improve the utilization of catalyst; (3) the proton polymer used as adhesive can improve the combine force between metal particle and conductive ceramic; (4) the proton polymer is proton conductor, and the composed catalyst has proton conductive function. The relative preparation comprises that preparing the conductive ceramic carrier decorated by proton polymer, then loading catalyst metal particles on its surface, whose average diameter is 2-5nm. And the catalyst can be prepared into fuel battery chip CCM, with better electric output property.

Description

technical field [0001] The invention relates to a catalyst, especially a catalyst used in a fuel cell, which is characterized in that the carrier of the catalyst is a conductive ceramic modified by a proton-conducting high polymer. The invention also relates to a preparation method of the catalyst. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC for short), as a new type of energy device, has many advantages such as low operating temperature, no pollution, high specific power, and rapid start-up, and has attracted more and more attention. It is a hotspot that countries all over the world are competing to study. The catalyst commonly used in fuel cells is the noble metal platinum or platinum alloys. However, platinum resources are scarce and expensive, so it is necessary to increase the utilization rate of platinum and reduce the amount of platinum to reduce the cost of fuel cells. At present, carbon black is generally used as a catalyst carrier, be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92B01J32/00B01J33/00B01J31/00B01J23/38B01J37/00
CPCY02E60/50
Inventor 木士春尹诗斌陈磊潘牧袁润章
Owner WUHAN UNIV OF TECH
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