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Electrocatalyst for fuel cell membrane electrode and preparation method thereof and fuel cell membrane electrode

A fuel cell membrane and electrocatalyst technology, which is applied to fuel cell components, battery electrodes, circuits, etc., can solve the problem of not being able to obtain the effect of non-humidification/self-humidification, and achieve large-scale preparation and non-humidification. The effect of good performance and simple preparation process

Inactive Publication Date: 2009-12-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] So far, none of these methods can obtain the ideal non-humidification / self-humidification effect

Method used

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  • Electrocatalyst for fuel cell membrane electrode and preparation method thereof and fuel cell membrane electrode
  • Electrocatalyst for fuel cell membrane electrode and preparation method thereof and fuel cell membrane electrode
  • Electrocatalyst for fuel cell membrane electrode and preparation method thereof and fuel cell membrane electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of composite carrier: Take 0.0155g of tetraethyl orthosilicate and add it to 3ml of ethanol, then add 1 gram of XC-72R carbon black that has been oxidized and heat-treated, and stir at room temperature for 15 minutes to make orthosilicate and carbon black uniform Disperse, then in a vacuum drying oven at 40°C, vacuumize to remove residual ethanol, then heat treat at 300°C for 3h under an inert atmosphere, and cool; that is, a carbon composite carrier material containing silicon dioxide is obtained; it can be expressed as SiO2 / XC-72R or SiO2 / C;

[0041] (2) Preparation of electrocatalyst: take the composite carrier prepared in step (1) as the carrier, and adopt the organic sol method described in patent ZL200510102382. A mixture of acetone and ethylene glycol is used as a solvent, ethylene glycol is used as a reducing agent, chloroplatinic acid is used as a precursor of platinum, and sodium citrate is used as a complexing agent. React in an autoclave at ...

Embodiment 2

[0047] Except that the amount of tetraethyl orthosilicate added is 0.155g, and the SiO2 content is 3% in the catalyst prepared at last, other steps are completely identical with embodiment 1.

[0048] The results show that: using SiO 2 3% Pt / SiO 2 The membrane electrode made by / C catalyst showed a very good effect of avoiding humidification. Within 3 hours, the current density was only reduced by 200A / cm 2 (from 900mA / cm 2 down to 700mA / cm 2 ), and then basically stable within 20 hours (see figure 2 ).

Embodiment 3

[0053] In addition to increasing the amount of ethyl orthosilicate, and using acetone to replace absolute ethanol as the dispersion medium of ethyl orthosilicate, the catalyst Pt / SiO 2 SiO in / C 2 Content is except 6%, other is with embodiment 1.

[0054] see results image 3 and Table 1. Its anti-humidification effect is lower than that of the membrane electrode prepared by the catalyst containing 3% silicon dioxide.

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Abstract

The invention relates to the fuel cell field and discloses an electrocatalyst for fuel cell membrane electrode and a preparation method thereof and a fuel cell membrane electrode; the electrocatalyst is characterized in that the electrocatalyst is prepared by loading precious metals on composite carrier and the composite carrier is carbon carrier deposited with water-retaining substance; in the electrocatalyst, the content of the water-retaining substance is 0.3-10wt% and the content of the precious metals is 10-60wt%. An electrode can be prepared by adopting the conventional method and using the electrocatalyst prepared by the method of the invention which is used as anode catalyst and the membrane electrode with good moisture-holding ability can be obtained; in the preparation method, a moisture-holding layer is needed to build and no moisture-holding substance is needed to add in the proton exchange membrane, thus avoiding the problems such as the increment of the internal resistance of cells which is caused by the addition of the moisture-holding substance in the moisture-holding layer and the proton exchange membrane, and providing a simple and efficient approach for preparing wetting-proof membrane electrode.

Description

technical field [0001] The invention relates to a fuel cell. An electrocatalyst with self-humidification function in the fuel cell is prepared, and a membrane electrode with good self-humidification performance is prepared by using the electrocatalyst. Background technique [0002] In proton exchange membrane fuel cells (PEMFCs), water management has a decisive impact on cell performance. When PEMFC is running, it is usually necessary to humidify the reaction gas externally to ensure that there is enough water in the proton exchange membrane and electrodes to obtain high proton conductivity and electrochemical performance. Gas humidification is generally completed by complex auxiliary humidification equipment. The humidification system increases the complexity of the PEMFC system and increases the cost of the PEMFC system. At the same time, external humidification needs to consume a lot of energy, which reduces the total output power of the fuel cell system; in fact, a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M4/86H01M8/02
CPCH01M4/8828H01M4/8803H01M4/9083H01M4/92H01M4/9075Y02E60/50Y02E60/522
Inventor 廖世军朱华平徐磊敏苏华能杨丽君吴燕妮梁振兴
Owner SOUTH CHINA UNIV OF TECH
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