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Proton exchange film fuel cell stainless steel bi-polar plate and production thereof

A proton exchange membrane, fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, fuel cell components and other directions, can solve the problems of low corrosion rate, low normal operating voltage of the battery, large surface contact resistance, etc. The effect of low cost, excellent corrosion resistance and simple process

Inactive Publication Date: 2009-07-22
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

[0018] 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. The synthesis of the underlying polypyrrole coating adopts a dual-electrode system, that is, a platinum sheet is used as an auxiliary electrode, and 304 stainless steel is used as a working electrode. Prepared at 0.4mol / dm 3 Pyrrole+0.15mol / dm 3 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 5°C, and the synthesis current is constant at 3mAcm -2 , the synthesis time was 20 minutes, and the coating thickness was about 12 μm; the polyaniline coating was synthesized on 304SS / polypyrrole using a three-electrode system, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was a platinum shee...

Embodiment 2

[0023] 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. The synthesis of the underlying polypyrrole coating adopts a dual-electrode system, that is, a platinum sheet is used as an auxiliary electrode, and 304 stainless steel is used as a working electrode. Coating preparation at 0.4mol / dm 3 pyrrole and 0.15mol / dm 3 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 5°C, and the synthesis current is constant at 3mAcm -2 , the synthesis time was 12 minutes, and the thickness of the coating was 8 μm; the polyaniline coating was synthesized on 304SS / polypyrrole using a three-electrode system, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was ...

Embodiment 3

[0028] 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. The synthesis of the underlying polypyrrole coating adopts a dual-electrode system, that is, a platinum sheet is used as an auxiliary electrode, and 304 stainless steel is used as a working electrode. Coating preparation at 0.1mol / dm 3 pyrrole and 0.1mol / 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 5°C, and the synthesis current is constant at 1.5mAcm -2 , the synthesis time was 30 minutes, and the coating thickness was 10 μm; the polyaniline coating was synthesized on 304SS / polypyrrole using a three-electrode system, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was...

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Abstract

The invention provides a stainless steel bipolar plate of a proton exchange membrane fuel cell and the preparation thereof. The surface of the stainless steel bipolar plate is covered with a corrosion resistant and conductive complex coating of polypyrrole / polyaniline with the thickness of the coating standing at 10-25mum and the thickness ratio of a bottom polypyrrole coating and a top polyaniline coating standing between 1:1 and 1:4. The invention has the advantages of simple technique, no limitation by the shape of the workpiece structure, low processing coat, excellent corrosion resistant performance of the coating in sour environment and the like, thereby being capable of improving the corrosion resistant performance of metal and lowering contact resistance of the metal. The coating is for the first time applied to the protection of the stainless steel bipolar plate of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to fuel cell technology, and particularly provides a stainless steel bipolar plate of a proton exchange membrane fuel cell and a preparation method thereof. The stainless steel bipolar plate has good corrosion resistance and electrical conductivity. 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 mineral energy and the requirements of environmental protection, clean and efficient FC technology has become a new field, and has been paid more and more attention by various countries. 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 ve...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/10H01M8/0228
CPCY02E60/50Y02P70/50
Inventor 曾潮流任延杰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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