Fuel cell bipolar plate and preparation method thereof

A fuel cell and bipolar plate technology, which is applied to fuel cells, fuel cell parts, circuits, etc., can solve the problems of shortened service life of bipolar plates, easy peeling of coatings, material corrosion, etc. The effect of compact shape and low cost

Active Publication Date: 2020-12-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the actual application process of the fuel cell bipolar plate, there will be problems of material corrosion, surface passivation, and coating easy to fall off, which will shorten the service life of the bipolar plate and increase the cost

Method used

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  • Fuel cell bipolar plate and preparation method thereof
  • Fuel cell bipolar plate and preparation method thereof
  • Fuel cell bipolar plate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The metal substrate in this embodiment is a titanium plate, and the preparation process includes the following steps:

[0033] (1) Surface pretreatment of titanium sheet

[0034] Use 400#, 600#, 800# sandpaper to remove the oxide film on the surface of the titanium sheet, and then clean and activate the surface of the substrate: clean with acetone→clean with alcohol→clean with water→activate with palladium chloride solution for one minute. Pretreatment of the material can improve the bonding force of the coating and improve the quality of the coating, otherwise the coating may appear uneven or fall off.

[0035] (2) Nitrogen doping treatment

[0036] Put the titanium plate in the nitriding furnace for glow plasma nitrogen doping, the nitrogen doping gas is NH 3 , the high glow voltage is 700V, the current is 14A, the vacuum in the furnace is 150Pa, the nitriding temperature is 700°C, and the nitriding time is 2h; thus, nitrogen doping is performed on the surface of th...

Embodiment 2

[0049] The preparation process of this example is basically the same as that of Example 1, except that the electroplating solution is heated to 55°C respectively, which is recorded as 55°C Ti / TiN / Ni-Cu.

Embodiment 3

[0051] The preparation process of this example is basically the same as that of Example 1, except that the electroplating solution is heated to 65°C respectively, which is recorded as 65°C Ti / TiN / Ni-Cu.

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Abstract

The invention discloses a fuel cell bipolar plate and a preparation method thereof. The fuel cell bipolar plate comprises a metal substrate and a coating covering the surface of the substrate, whereinthe surface of the metal substrate is doped with a nitrogen element, the coating comprises a chemically plated nickel layer and an electroplated nickel-copper alloy layer, and the metal substrate issubjected to pretreatment, nitrogen doping treatment, chemical nickel plating and nickel-copper alloy layer electroplating. According to the invention, the fuel cell bipolar plate has the advantages of uniform and compact surface coating, good combination of the coating and a matrix, difficult shedding, good corrosion resistance and stability in a fuel cell environment, convenient and reliable preparation process and low cost.

Description

technical field [0001] The invention relates to a bipolar plate and its preparation method, in particular to a fuel cell bipolar plate and its surface coating preparation method. Background technique [0002] Proton exchange membrane fuel cell has the advantages of high efficiency, energy saving, safety and environmental protection, such as: it can operate at a lower temperature (<100°C), has a high energy conversion efficiency (40% to 60%), and does not work To generate noise, the battery efficiency can be adjusted by changing the single battery pack. Its single cell consists of a proton exchange membrane, electrodes and conductive bipolar plates. The proton exchange membrane only conducts protons, so hydrogen protons can pass directly through the proton exchange membrane to the cathode, while electrons arrive through an external circuit, where the bipolar plate as electron transfer accounts for more than 40% of the battery cost. Therefore, various methods of chemicall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0206H01M8/0228
CPCH01M8/0206H01M8/0228Y02E60/50
Inventor 欧阳春史兴岭
Owner JIANGSU UNIV OF SCI & TECH
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