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Method for surface treating stainless steel double polar plate of proton exchanging film fuel cell

A technology of proton exchange membrane and fuel cell, which is applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as low corrosion rate, high surface contact resistance, and low normal working voltage of batteries

Inactive Publication Date: 2006-06-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corrosion rate of titanium in the PEMFC environment is very low, but its surface contact resistance is large, which makes the normal working voltage of the battery low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A two-electrode system is adopted, that is, a platinum sheet is used as an auxiliary electrode, and 18-8 stainless steel is used as a working electrode. Before synthesis, the surface of stainless steel needs to be polished to 240# with water abrasive paper, cleaned and dried with distilled water and acetone, so that the prepared coating can be well combined with the stainless steel substrate. Coating preparation at 0.4mol / dm 3 pyrrole and 0.15mol / dm 3 It is carried out in an aqueous solution of sodium lauryl sulfate. During the synthesis process, an ice-water bath is used to keep the synthesis temperature at about 0°C, and the synthesis current is constant at 3mAcm -2 , and the synthesis time was 24 minutes. In order to avoid side reactions such as oxidation and low molecular weight polymerization of the pyrrole monomer during the synthesis process, protective measures such as avoiding light and nitrogen gas were adopted, and finally formed a layer of 15 μm thick on th...

Embodiment 2

[0020] A two-electrode system is adopted, that is, a platinum sheet is used as an auxiliary electrode, and 18-8 stainless steel is used as a working electrode. Before synthesis, the surface of stainless steel needs to be polished to 240# with water abrasive paper, cleaned and dried with distilled water and acetone, so that the prepared coating can be well combined with the stainless steel substrate. Coating preparation at 0.2mol / dm 3 pyrrole and 0.08mol / dm 3 Carried out in an aqueous solution of sodium dodecyl sulfate, the synthesis temperature is 15°C, and the synthesis current is constant at 3mAcm -2 , the synthesis time was 20min. In order to avoid side reactions such as oxidation and low molecular weight polymerization of the pyrrole monomer during the synthesis process, light protection measures were adopted, and finally a layer of sodium lauryl sulfate with a thickness of 15 μm was formed on the surface of the stainless steel. Doped polypyrrole corrosion resistant, con...

Embodiment 3

[0024] A two-electrode system is adopted, that is, a platinum sheet is used as an auxiliary electrode, and 18-8 stainless steel is used as a working electrode. Before synthesis, the surface of stainless steel needs to be polished to 240# with water abrasive paper, cleaned and dried with distilled water and acetone, so that the prepared coating can be well combined with the stainless steel substrate. Coating preparation at 0.4mol / dm 3 pyrrole and 0.2mol / dm 3 Carried out in an aqueous solution of sodium dodecyl sulfate, the synthesis temperature is 15°C, and the synthesis current is constant at 3mAcm -2 , the synthesis time was 15 minutes. In order to avoid side reactions such as oxidation and low molecular weight polymerization of the pyrrole monomer during the synthesis process, light protection measures were adopted. Finally, a layer of sodium dodecyl sulfate with a thickness of 15 μm was formed on the surface of the stainless steel. Doped polypyrrole corrosion resistant an...

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Abstract

The invention is a surface processing method for the stainless steel dipolar plates of a proton exchange fuel battery, characterized in that the surfaces of the dipolar plates is covered with a synthesized corrosion resistant, conductive sodium dodecyl sulphate-doped polypyrrole coating whose thickness is 10 mum-30 mum. The method synthesizes a corrosion resistant, conductive polypyrrole coating, which can be applied to the surfaces of various stainless steels (such as 18-8. 316 and 310 stainless steels). The conductivity of the polypyrrole coating is about 10S / cm, and as the thickness of the polypyrrole coating reaches about 15 micron, it can play the role in long-time protecting the stainless steel substrate.

Description

Technical field: [0001] The invention relates to fuel cell technology, and in particular provides a method for making the stainless steel bipolar plate have good corrosion resistance and electrical conductivity through surface treatment of the proton exchange membrane fuel cell stainless steel bipolar plate. Background technique: [0002] A fuel cell (FC) is a high-efficiency power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy through electrochemical reactions. With the increasing tension of fossil energy and the increasing importance of environmental protection, clean and efficient FC technology has become a new field and has been paid more and more attention. Proton exchange membrane fuel cell (proton exchange membrane fuel cell, referred to as PEMFC) is a new generation of fuel cell with solid polymer proton exchange membrane as electrolyte, hydrogen or reformed gas as fuel, and oxygen or air as oxidant. It has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 张弢曾潮流
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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