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304 stainless steel bipolar plate for SnO2 film modified proton exchange membrane fuel cell (PEMFC) and preparation method of 304 stainless steel bipolar plate

A 304 stainless steel, bipolar plate technology, applied in solid-state chemical plating, metal material coating technology, coating and other directions, can solve the problems of difficult to widely use, practical limitations, complex methods, etc., to achieve good corrosion resistance and Stability, avoid battery life impairment, good mechanical strength effect

Inactive Publication Date: 2013-10-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, workers at home and abroad have carried out a lot of research on stainless steel bipolar plates, but various methods still have certain deficiencies. For example, Feng et al. have modified stainless steel bipolar plates by magnetron sputtering ion plating, although Corrosion resistance is good, but due to the complexity of the method, there are certain limitations in practicability, so it is not easy to be widely used

Method used

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  • 304 stainless steel bipolar plate for SnO2 film modified proton exchange membrane fuel cell (PEMFC) and preparation method of 304 stainless steel bipolar plate
  • 304 stainless steel bipolar plate for SnO2 film modified proton exchange membrane fuel cell (PEMFC) and preparation method of 304 stainless steel bipolar plate
  • 304 stainless steel bipolar plate for SnO2 film modified proton exchange membrane fuel cell (PEMFC) and preparation method of 304 stainless steel bipolar plate

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Embodiment 1

[0041] A kind of SnO 2 The preparation method of 304 stainless steel bipolar plates for membrane modified PEMFC comprises the steps:

[0042] (1), 3.2gSnCl 2 2H 2 O, 0.23g polyethylene glycol 2000, 50ml absolute ethanol, electromagnetically stirred at 50°C for 2h, cooled naturally, and aged for 24h to obtain a colorless transparent sol;

[0043] (2) Pre-treat the 304 stainless steel substrate material 10mm×70mm×2mm, that is, use metallographic sandpaper (#2~#6) to polish it step by step, and degrease the polished substrate 304 stainless steel with absolute ethanol, And use ultrasonic cleaning for 5min, then wash with deionized water, and finally dry with air for use;

[0044] (3) Take 10ml of the sol from step (1) and put it into a 10ml small beaker, and then dip-pull the 304 stainless steel treated in step (2) to form a film. The dipping time is 20s, and the pulling speed is 2mm / s. The number of pulls is 2 times. After the pull is completed, the film is dried naturally an...

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Abstract

The invention discloses a 304 stainless steel bipolar plate for SnO2 film modified PEMFC and a preparation method thereof. That is to prepare the precursor solution with SnCl2·2H2O, and prepare a layer of corrosion-resistant SnO2 film on the surface of 304 stainless steel by combining sol dipping-pulling method and alcohol thermal method. Because SnO2 has good corrosion resistance in weakly acidic environment, the 304 stainless steel bipolar plate for SnO2 film modified PEMFC obtained in the present invention can effectively improve its performance and performance under PEMFC environment (0.05MH2SO4+2ppmHF). Extend its service life. And the modified 304 stainless steel bipolar plate still has good mechanical strength. In addition, the preparation method of the present invention can be operated under simple conditions because it does not require complex procedures and equipment, so it has the characteristics of simple operation and favorable large-scale production.

Description

technical field [0001] The present invention relates to a kind of SnO 2 The invention discloses a 304 stainless steel bipolar plate for membrane-modified PEMFC and a preparation method thereof, belonging to the technical field of stainless steel surface modification. Background technique [0002] In the application field of PEMFC, due to the advantages of high energy conversion efficiency, low-temperature start-up, and no pollution, it has broad application prospects in military and portable power supplies, and is also the most promising power source for vehicles such as vehicles instead of fossil fuels. [0003] The bipolar plate is one of the key components of PEMFC, accounting for 80% of the total mass and 45% of the cost of the cell stack. The ideal bipolar plate material must have the advantages of high electrical conductivity, corrosion resistance, low density, high mechanical strength, high air tightness and easy processing and molding, so its performance directly af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C20/08
Inventor 徐群杰潘红涛云虹邓先钦刘明爽周罗增
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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