Proton conductor modified fuel cell catalyst which uses conductive ceramics as carrying agent and preparation

A technology of conductive ceramics and fuel cells, applied in the direction of catalyst activation/preparation, fuel cell parts, catalyst carriers, etc., can solve the problems of fuel cell catalysts that have not yet existed, and achieve improved corrosion resistance, service life, and durability Improved effect

Inactive Publication Date: 2008-10-22
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 fuel cell catalysts modified by proton conductors and supported by conductive ceramics.

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 diameter 10 nanometers to 50 nanometers, purity greater than 95%, added to 20 ml of a mixture of absolute ethanol and water, the mass ratio of absolute ethanol and water is 1:1, ultrasonic (R-S150 Ultrasonic cell pulverizer) dispersed for 5 minutes to obtain TiB 2 Conductive Ceramic Dispersions. Take 4 ml of Nafion with a mass concentration of 5% @ The solution was added to the mixed solution of 240 ml of absolute ethanol and water, the mass ratio of absolute ethanol and water was 1:1, after stirring for 10 minutes, 40 ml of 4 g / L H 2 PtCl 6 The solution continued to stir, and the pH of the solution was adjusted to 8 with NaOH, and heated to reflux at 80° C., the solution gradually turned from light yellow to black, and finally dark black, and a stable Pt colloid was obtained. Then TiB 2 The conductive ceramic dispersion was added dropwise to the prepared Pt colloid, and the stirring was continued for 2 ho...

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 mixture of 20 ml of isopropanol and water, the mass ratio of isopropanol to water is 1:1, and ultrasonically (R -S150 Ultrasonic Cell Pulverizer) to disperse for 10 minutes to obtain a TiC conductive ceramic dispersion. Get 4 milliliters of sulfonated polyphenylene sulfide resin (SPPS) solution with a mass content of 5% and add it to a mixed solution of 240 milliliters of isopropanol and water. The mass ratio of isopropanol and water is 1:1. After stirring for 5 minutes, add 40 mL of 4 g / L HO 2 PtCl 6 The solution continued to stir, and the pH of the solution was adjusted to 10 with NaOH, and heated to reflux at 100°C. The solution gradually turned from light yellow to black, and finally dark black, and a stable Pt colloid was obtained. Then, the TiC conductive ceramic dispersion liquid was added dropwise into the prepared Pt gel, and the...

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 mixture, the mass ratio of methanol and water is 100:1, ultrasonic (R-S150 ultrasonic cell pulverizer) Disperse for 6 minutes to get BaPbO 3 Conductive Ceramic Dispersions. Get 4 milliliters of sulfonated polyimide resin (SPI) solutions with a mass content of 5% and add them to a mixed solution of 240 milliliters of methanol and water. The mass ratio of methanol and water is 100:1. After stirring for 6 minutes, add 40 milliliters 4 g / L H 2 PtCl 6 The solution continued to stir, and the pH of the solution was adjusted to 9 with NaOH, and heated to reflux at 90° C., the solution gradually turned from light yellow to black, and finally dark black, and a stable Pt colloid was obtained. Then the BaPbO 3 The conductive ceramic dispersion was added dropwise to the prepared Pt gel, and the stirring was continued for 3 hours to...

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Abstract

The invention relates to a fuel battery catalyst which is decorated by proton conductor and uses conductive ceramic as carrier, wherein compared with carbon-black carrier catalyst, it has the advantages that: (1) it has better conductive property and anti-corrosion property; (2) the surface of conductive ceramic has less holes, therefore, the expensive metal catalyst particles can be anchored on the carrier to improve the utilization of catalyst; (3) the conductive proton polymer is used as adhesive to improve the adhesive force between the metal particle and the carrier conductive ceramic; (4) since the conductive proton polymer is conductor, the composed catalyst has conductive proton function. The invention is multifunctional fuel battery catalyst. And its preparation comprises: first, preparing the catalyst nanometer expensive metal rubber decorated by conductive proton; then depositing the rubber on the carrier; the average diameter of catalyst expensive metal is 2-5 nanometers; and using catalyst to produce fuel battery chip CCM, to form single battery, with better electric output property.

Description

technical field [0001] The invention relates to a fuel cell catalyst, in particular to a fuel cell catalyst with the function of conducting protons. It is characterized in that the precious metal particles of the catalyst are modified by the proton conducting high polymer, and the carrier of the catalyst is conducting ceramics. 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. Therefore, it is necessary to increase the utilization rate of platinum and reduce the amount of plat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92B01J32/00C08J5/22H01M8/02B01J37/00
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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