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Fuel cell stainless steel bipolar plate preparation and surface modification method

A surface modification, fuel cell technology, used in fuel cells, fuel cell parts, pretreated surfaces, etc., can solve the problems of decreased membrane electrode performance, increased fuel cell internal resistance, high cost, and improved corrosion resistance. The effect of improving performance, corrosion resistance, and reducing contact resistance

Active Publication Date: 2019-09-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the metal bipolar plate is prone to corrosion in the operating environment of the PEMFC fuel cell, the metal ions produced by corrosion will lead to a decrease in the performance of the membrane electrode, and the passivation film formed on the surface of the bipolar plate will increase the internal resistance of the fuel cell. resulting in lower fuel cell power density
At present, the surface modification method of metal bipolar plate is mainly to prepare a layer of noble metal coating, metal carbon / nitride coating, conductive Polymer coating and carbon film, etc., but these methods generally have problems such as complicated process technology and high cost

Method used

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  • Fuel cell stainless steel bipolar plate preparation and surface modification method
  • Fuel cell stainless steel bipolar plate preparation and surface modification method
  • Fuel cell stainless steel bipolar plate preparation and surface modification method

Examples

Experimental program
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Embodiment 1

[0073] (1) Preparation of stainless steel bipolar plates by chemical etching

[0074] Wire-cut a 1.0mm stainless steel plate into a substrate with a size of 156mmⅹ50mm; take 270.3g of ferric chloride hexahydrate solid, add 630.7mL of deionized water, and configure FeCl with a mass fraction of 30% 3 Chemical etching solution, then add 13mL concentrated nitric acid and 25mL concentrated hydrochloric acid. After degreasing the stainless steel substrate in a 35% sodium hydroxide solution at 60°C for 30 minutes, wash it with water and dry it. A 30 μm thick photosensitive ink layer was rolled on the surface of the degreased stainless steel substrate, and dried at 85° C. for 1 hour. Put the film film with flow channel pattern close to the ink layer of the photosensitive substrate, and irradiate it under a UV lamp for 80s; develop the exposed photosensitive ink layer in a sodium carbonate solution with a mass fraction of 1% for 2min, and cure it at 180°C for 2h Afterwards, the devel...

Embodiment 2

[0078] Nano-superconducting carbon / nano-graphite / PI / PF coating preparation

[0079] Take 20mL of nitrogen nitrogen dimethylacetamide (DMAC) and add it into two cylinders A and B in equal amounts, and add 0.1303g and 0.0.3958g of nano superconducting carbon into A and B respectively. Weigh 0.3958g of nano-graphite with a particle size of 30nm, add it to B, add a magnetic stirrer, adjust the rotation speed to 800r / min, and the time to 3.0h. Then take 1.1724g, 0.2638g of PF resin with a solid content of 80%, and then weigh 0.2638g of PI resin with a solid content of 70% and add them to B, adjust the rotation speed to 1000r / min, and the time to 3h. The obtained solid-to-liquid ratio is: 1:8, carbon content is 10% nanometer superconducting carbon / PF hybrid coating (S1), and conductive material contains nanometer superconducting carbon / nanographite / PF / PI (nano superconducting carbon:nanostone=1:1, PF:PI=1:1) mixed coating (S2). Then preheat the stainless steel bipolar plate to 220...

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Abstract

The invention provides a fuel cell stainless steel bipolar plate preparation and surface modification method, which belongs to the technical field of fuel cells. The method comprises steps: the stainless steel bipolar plate is firstly prepared; and stainless steel bipolar plate surface modification is then carried out. After the stainless steel bipolar plate is prepared through chemical etching, with N,N-dimethyl acetamide (DMAC) as a solvent, nanocarbon / graphite as a conductive material and polyimide resin solution (PI) / phenolic resin solution (PF) as an adhesive, a nanocarbon / PI / PF mixed coating (S1) with a carbon content of 10 to 30% and a nanocarbon / PI / PF mixed coating (S2) with a conductive material content of 40 to 70% are prepared respectively. Then, in a nitrogen atomization spray method, spray is carried out on the stainless steel bipolar plate. Finally, through low temperature hot pressing treatment, the electrical conductivity and the corrosion resistance of the coating on the ridge of the stainless steel bipolar plate are improved, and the contact resistance with carbon paper is reduced. The process is simple and efficient, the coating has good corrosion resistance and strong electrical conductivity, and the bonding force between the coating and the substrate is strong.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a preparation and surface modification method of a fuel cell stainless steel bipolar plate. Background technique [0002] As one of the key components in proton exchange membrane fuel cells, bipolar plates have a great impact on the fuel cell's operating life, cost and wide-ranging applications. At present, metal bipolar plates have gradually become the mainstream direction of bipolar plate research because of their small size, strong electrical conductivity, and high strength. However, since the metal bipolar plate is prone to corrosion in the operating environment of the PEMFC fuel cell, the metal ions produced by corrosion will lead to a decrease in the performance of the membrane electrode, and the passivation film formed on the surface of the bipolar plate will increase the internal resistance of the fuel cell. As a result, the power density of the fuel cell is reduced. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/021H01M8/0228C23F1/02C23F1/28B05D1/02B05D3/02B05D7/14B05D7/24
CPCB05D1/02B05D3/0218B05D7/14B05D7/24C23F1/02C23F1/28H01M8/021H01M8/0228Y02E60/50
Inventor 王新东徐招王萌杨兆一
Owner UNIV OF SCI & TECH BEIJING
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