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Composite catalyst of self-humidifying fuel cell and manufacturing method and application thereof

A composite catalyst and fuel cell technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of increasing membrane internal resistance, reducing battery performance, and unsuitability, so as to improve activity and prepare The method is simple and the effect of improving performance

Inactive Publication Date: 2012-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adds a catalyst to the membrane, which is easy to cause a short circuit, and the addition of a non-proton conductor carrier will increase the internal resistance of the membrane and reduce the performance of the battery, so it is not suitable for practical applications.
[0005] Chinese patent ZL200610134014.8 discloses "a composite proton exchange membrane for self-humidifying fuel cells and its synthesis method". Pouring, spraying or casting methods are filled into porous reinforced membranes to prepare self-humidifying composite proton exchange membranes, but the conductivity of self-humidifying composite proton exchange membranes prepared by this method is low
However, this method has not yet found an effective method for determining the structure and distribution of hydrophilic pores and hydrophobic pores in MPL; and the content of hydrophilic carbon powder in MPL cannot be accurately determined.
[0013] So far, there are certain defects in the water balance method in PEMFC, and none of them can achieve a good self-humidification / no-humidification effect

Method used

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  • Composite catalyst of self-humidifying fuel cell and manufacturing method and application thereof
  • Composite catalyst of self-humidifying fuel cell and manufacturing method and application thereof
  • Composite catalyst of self-humidifying fuel cell and manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of composite carrier: Add 2ml of tetraethyl orthosilicate to ethanol to make 100ml of tetraethyl orthosilicate / ethanol solution to obtain a mixed solution;

[0049] (2) Add 1 gram of RuCl 3 ·3H 2 O was added to ethanol to make 20mg / ml RuCl 3 ·3H 2 O / ethanol solution, obtains mixed solution;

[0050] (3) Take 5.9ml of the mixed solution obtained in step (1) and 0.3ml of the mixed solution obtained in step (2) (volume ratio is 19.7:1), then add 500mg of oxidized XC-72R carbon black, at room temperature Stir under low pressure and ultrasonic for half an hour each to mix tetraethyl orthosilicate and metal precursors with carbon black evenly. Evaporate in a water bath at 70°C for 4 hours. After evaporating ethanol, put it in a vacuum oven at 80°C and vacuumize for 6 hours to further remove the residue. ethanol, and then sintered at 300°C for 8 hours under an inert atmosphere, and cooled to obtain a composite carrier. The content of silicon dioxide in the ...

Embodiment 2

[0058] The preparation of the composite carrier is similar to the preparation of 6.5wt%RuSiOx / C in Example 1, the difference is: take 6ml of the mixed solution obtained in step (1) in Example 1, and take 1.2 ml of the mixed solution obtained in step (2) in Example 1 ml, take 500mg of oxidized carbon nanotubes, the calcination temperature is 400°C, the calcination time is 5h, the silicon oxide content in the carrier is 6wt%, the ruthenium oxide content is 2wt%, which can be expressed as 8wt%RuSiOx / C, ruthenium oxide The mass ratio to silicon oxide is 1:3; the catalyst preparation steps, membrane electrode preparation steps, methanol electrocatalytic performance evaluation steps, oxygen reduction performance evaluation steps and membrane electrode testing steps are all the same as in Example 1.

[0059]After testing: the methanol anodic oxidation current (forward scanning peak current) density of the catalyst prepared in this embodiment is 0.59A / mgPt, and the oxygen reduction cur...

Embodiment 3

[0061] The preparation of the composite carrier is similar to the preparation of 6.5wt%RuSiOx / C in Example 1, the difference is: take 6.1ml of the mixed solution obtained in step (1) in Example 1, and take the mixed solution obtained in step (2) in Example 1 1.7ml, the calcination temperature is 500°C, the silicon oxide content in the carrier is 6wt%, the ruthenium oxide content is 3wt%, which can be expressed as 9wt%RuSiOx / C, the mass ratio of ruthenium oxide and silicon oxide is 1:2; The preparation steps, membrane electrode preparation steps, methanol electrocatalytic performance evaluation steps, oxygen reduction performance evaluation steps and membrane electrode testing steps are all the same as in Example 1.

[0062] Figure 1(a) And Fig. 1(b) is the structure characterization diagram of the composite catalyst using JEOL JEM2100 electron microscope. It can be seen from the figure that the composite catalyst is evenly distributed and the particle size is about 2.5nm.

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Abstract

The invention provides a composite catalyst of a self-humidifying fuel cell and a manufacturing method and application thereof. The composite catalyst is prepared by depositing water-retaining substance and metallic oxide together on a carbon carrier to obtain a composite carrier, and then bearing noble metal on the composite carrier by using a high-pressure organosol method or microwave-aided high-pressure organosol method. The water-retaining substance is silicon dioxide, titanium dioxide or tungsten trioxide, the metallic oxide is ruthenium oxide or iridium oxide, and the noble metal is platinum, platinum ruthenium or platinum palladium. In the invention, by adding the metallic oxide, the performance of the catalyst can be improved effectively; the catalyst is used directly, and a membrane electrode is manufactured by a spray coating method which not only can obtain a membrane electrode with good moisture retention, but also improves the performance of the membrane electrode by over 20% in comparison with the membrane electrode manufactured by using the catalyst without metallic oxide. The manufacturing method provided by the invention is simple, does not need special equipment and can realize large-scale production of the catalysts.

Description

technical field [0001] The invention relates to an electrocatalyst for a fuel cell, in particular to a composite catalyst for a self-humidifying fuel cell and its preparation method and application. Background technique [0002] Water management in proton exchange membrane fuel cells (PEMFC) has become one of the hot topics in fuel cell research. During the operation of PEMFC, in order to maintain a high proton conductivity of the membrane electrode (MEA), additional humidification of the reaction gas is usually required, and the resulting humidification equipment increases the cost and complexity of the fuel cell system, and Brings additional energy consumption. In fact, the cathode of PEMFC will produce a large amount of water during operation. Therefore, some researchers hope to use this water to realize self-humidification or non-humidification membrane electrodes and corresponding fuel cell systems. [0003] At present, research on self-humidifying fuel cells is mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/46B01J23/44
CPCY02E60/50
Inventor 廖世军曾巧曾建皇
Owner SOUTH CHINA UNIV OF TECH
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