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Doped Multilayer Gradient Coatings of Metallic Bipolar Plates for Fuel Cells

A metal bipolar plate and fuel cell technology, which is applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problem of the large difference in physical properties between carbon film and stainless steel substrate, poor film-base bonding force, and poor film-base bonding. and other problems, to achieve the effect of improving stacking performance and service life, low through porosity, excellent electrical conductivity and corrosion resistance

Active Publication Date: 2016-06-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 pores, technicians in the field are committed to developing a C / CrN multi-layer gradient doped with magnetron sputtering ion plating deposition elements. The membrane method improves the bonding force of the membrane base, reduces the porosity, and reduces the cost, so as to achieve the goal of preparing high-quality, high-conductivity and corrosion-resistant coatings on the surface of stainless steel

Method used

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  • Doped Multilayer Gradient Coatings of Metallic Bipolar Plates for Fuel Cells
  • Doped Multilayer Gradient Coatings of Metallic Bipolar Plates for Fuel Cells
  • Doped Multilayer Gradient Coatings of Metallic Bipolar Plates for Fuel Cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1, ion sputtering cleaning;

[0039] First, put the ultrasonically cleaned stainless steel bipolar plate in the UDP650 closed-field unbalanced magnetron sputtering ion coating equipment, and start vacuuming to make the background vacuum degree lower than 5×10 -6 Torr, start feeding argon to keep the vacuum at 2×10 -2 Torr;

[0040] Secondly, apply the 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, passivation film, etc. that may remain on the surface of the stainless steel, and obtain a certain surface roughness ;

[0041] Step 2, depositing a pure chromium transition layer;

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

[0043] Step 3, depositing the CrN coating and controlling the doping structure at the same time;

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

Embodiment 2

[0053] In this embodiment, the first, second, and third steps are exactly the same as those in Embodiment 1. The difference is that when implementing the fourth, fifth, and sixth steps in this embodiment, while other parameters are consistent with those in Embodiment 1, the Ti target and The Al target is subjected to element doping and tissue regulation, and the target current of both the Ti target and the Al target is kept at 2A, and is gradually reduced to 0 during the fifth step.

[0054] The same test method as in Example 1 is used to detect the sample of Example 2. 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 surface contact resistance of the sample under the pressure condition of a typical fue...

Embodiment 3

[0056] In this embodiment, the first step is exactly the same as Embodiment 1, the difference is:

[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 keep the chromium target current at 5A, control the bias voltage at -70V, feed nitrogen gas at a gas rate of 20SCCM, turn on the Mo target and the W target at the same time, control the Mo target current at 0.5A, and the W target current at 1A. Depositing a 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, gradually increase the current from 0A to 6A, and 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 chromium target, Mo target and W target, control the bias v...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0206H01M8/0228C23C14/02C23C14/06H01M4/86
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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