Doped multilayer gradient coating for metal bipolar plates of fuel cell

A metal bipolar plate and fuel cell technology, which is applied to fuel cell parts, battery electrodes, metal material coating technology, etc., can solve the problem of large difference in physical properties between the carbon film and the stainless steel substrate, poor bonding force of the film base, and deposition Long time and other problems, to achieve the effect of improving the stacking performance and service life, low porosity, and improving the binding force of the membrane base

Active Publication Date: 2013-07-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the physical properties of the carbon film and the stainless steel substrate are quite different. Usually, the carbon film has a huge internal stress (usually up to GPa level), which leads to poor bonding force of the film substrate.
[0006] Aiming at the shortcomings of PVD deposition of graphite-like carbon film, such as long deposition time, poor film-base bonding and easy generation of

Method used

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  • Doped multilayer gradient coating for metal bipolar plates of fuel cell
  • Doped multilayer gradient coating for metal bipolar plates of fuel cell
  • Doped multilayer gradient coating for metal bipolar plates of fuel cell

Examples

Experimental program
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Example Embodiment

[0037] Example 1

[0038] Step 1. Ion sputtering cleaning;

[0039] First, place the ultrasonically cleaned stainless steel bipolar plate in a UDP650 closed-field unbalanced magnetron sputtering ion coating equipment, and start vacuuming so that the background vacuum is lower than 5×10 -6 Torr, start argon gas to maintain the vacuum at 2×10 -2 Torr;

[0040] Secondly, add a bias voltage to -500V, turn on the chromium target current, control it at 0.5A, and clean the stainless steel bipolar plate for 30 minutes to remove the oxide film and passivation film that may remain on the stainless steel surface, and obtain a certain surface roughness ;

[0041] Step 2: Depositing a pure chromium transition layer;

[0042] Adjust the substrate bias to -70V, the chromium target current is 7A, and deposit the Cr transition layer for 15 minutes.

[0043] Step 3: Depositing a CrN coating and simultaneously adjusting the doping structure;

[0044] Control the bias voltage at -60V, maintain the chromium ...

Example Embodiment

[0052] Example 2

[0053] The first, second, and third steps in this embodiment are exactly the same as those in embodiment 1. The difference is that when the fourth, fifth, and sixth steps are implemented in this embodiment, while other parameters are consistent with those in embodiment 1, the Ti target and The Al target is doped with elements and the structure is adjusted, and the target current of the Ti target and the Al target is maintained at 2A, and is gradually reduced to 0 during the fifth step.

[0054] The sample of Example 2 was tested using the same test method as that of Example 1. Such as image 3 As shown in the curve of Example 2, in the simulated fuel cell corrosion solution, the corrosion potential of the sample prepared in Example 2 is 0.382V, and the corrosion current density is 8.7×10 -8 A / cm 2 , The current density at 0.6V is 4.2×10 -7 A / cm 2 . Such as Figure 4 As shown in Example 2, the sample has a surface contact resistance of 2.8mΩ·cm under typical fue...

Example Embodiment

[0055] Example 3

[0056] The first step in this embodiment is exactly the same as in embodiment 1, except that:

[0057] The second step is to control the bias voltage at -50V, the chromium target current is 5A, and deposit the Cr transition layer for 30 minutes;

[0058] The third step is to maintain the chromium target current at 5A, control the bias voltage at -70V, and pass in nitrogen gas at a ventilation rate of 20SCCM. Turn on the Mo target and W target at the same time. The Mo target current is controlled at 0.5A and the W target current is controlled at 1A. Deposit CrN coating doped with Mo and W elements for 45 minutes;

[0059] The fourth step, control the bias voltage at -50V, turn on the graphite target, and gradually increase the current from 0A to 6A. At the same time, gradually reduce the current of the chromium target, Mo target and W target to 0A, and deposit the chromium carbon nitrogen transition layer for 15 minutes;

[0060] The fifth step is to close the chromiu...

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Abstract

The invention discloses a proton exchange membrane fuel cell metal bipolar plate doped with a multilayer gradient membrane on the surface, and a preparation method of the proton exchange membrane fuel cell metal bipolar plate. The Ti, Al and/or Mo doped C/CrN multilayer gradient membrane is prepared on the surface of the metal bipolar plate by a closed-field unbalanced magnetron sputtering technology. The doped C/CrN multilayer gradient coating comprises a graphite-like carbon coating, a CrN coating and a Cr transition layer as well as Ti, Al, Mo, W, Nb, Ni, Zr, Fe, Si and other elements doped in the graphite-like membrane and/or the CrN coating for structure and component control. Compared with the prior art, the proton exchange membrane metal bipolar plate provided by the invention has the characteristics of excellent conductivity and corrosion resistance, low open porosity and cost and the like, the stacking performance of a fuel cell is greatly improved, and the service life of the fuel cell is greatly prolonged; and the metal bipolar plate can meet the use requirements of the fuel cell, and has broad application prospect.

Description

technical field [0001] The invention relates to a surface coating of a fuel cell metal bipolar plate and a preparation method thereof, in particular to a doped multilayer gradient film of a proton exchange membrane fuel cell metal bipolar plate and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high energy conversion rate (40%-60%), zero emission, fast start-up, and high specific power, so it is considered to be an ideal device for vehicle-mounted energy and distributed power stations. The bipolar plate is a multifunctional key component in PEMFC, which accounts for 80% of the total weight of PEMFC, almost the entire volume, 10% of the total cost of PEMFC, and 20% of the material cost. The functions of the bipolar plate include supporting the membrane electrode group, collecting current, conducting gas and draining water. Therefore, bipolar plate materials are required to have certain strength, go...

Claims

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Application Information

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IPC IPC(8): H01M8/02C23C14/02C23C14/06H01M4/86
CPCY02E60/50
Inventor 冯凯李铸国韩子羿杨慧聪周宁康毛艳
Owner SHANGHAI JIAO TONG UNIV
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