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A method for surface modification of thin titanium bipolar plates for proton exchange membrane fuel cells

A proton exchange membrane and fuel cell technology, which is applied to fuel cell components, fuel cells, circuits, etc., can solve the problems of low film formation efficiency, high material loss, and poor stability of carbon coatings, and achieve membrane layer bonding Good, improved corrosion resistance, high stability

Active Publication Date: 2021-03-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of carbon coating by PVD has low film-forming efficiency, more material loss, and the stability of carbon coating at high potential is also poor, so more measures are needed to make it function better.

Method used

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  • A method for surface modification of thin titanium bipolar plates for proton exchange membrane fuel cells
  • A method for surface modification of thin titanium bipolar plates for proton exchange membrane fuel cells

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method comprises the following steps:

[0020] (1) Industrial pure titanium substrate, with a thickness of 0.05-0.5mm;

[0021] (2) Use detergent to wash off the large pieces of oil and dust on the surface of the titanium plate. After rinsing with deionized water, sonicate in acetone for 15-30 minutes to remove the residual oil, and then place it in oxalic acid solution at 70-100°C for 1-2 hours. Activate the surface to remove the passivation layer and improve the bonding force with the coating;

[0022] (3) The entire coating process is carried out in a high vacuum environment. First, the vacuum is roughly pumped to 1-3Pa, then the rough pumping system is turned off, and the fine pumping is turned on to 2x10 -3 ~2x10 -2 Pa, and then argon to maintain the flow rate of 100 ~ 500sccm to start coating;

[0023] (4) Turn on the target power supply, keep the current at 10-30A, control the bias voltage at -1000--500V, and clean the sputtering for 10-30 minu...

Embodiment 1

[0028] Use TA1 industrial pure titanium as the substrate, with a size of 20x60x0.1mm. After being ultrasonically treated with acetone for half an hour and oxalic acid at 80°C for one hour, it is placed in a vacuum chamber and vacuumed to 3x10 -3 Pa, the flow rate of argon is maintained at 300 sccm to start deposition. Turn on the bias voltage to -600V, turn on the Nb metal target, adjust the current to 30A, and perform cleaning and sputtering for 10 minutes; adjust the bias voltage to -300V to deposit the coating, adjust the current to 70A, and continue for 30 minutes to obtain the modified Nb Coated titanium bipolar plates.

Embodiment 2

[0030] Use TA1 industrial pure titanium as the substrate, with a size of 20x60x 0.2mm. After being ultrasonically treated with acetone for half an hour and oxalic acid at 80°C for one hour, it is placed in a vacuum chamber and evacuated to 3x10 -3 Pa, the flow rate of argon is maintained at 300 sccm to start deposition. Turn on the bias voltage to -700V, turn on the Cr metal target, adjust the current to 40A, and perform cleaning and sputtering for 20 minutes; adjust the bias voltage to -300V to deposit the coating, adjust the current to 85A, and continue for 45 minutes to obtain the modified Cr Coated titanium bipolar plates.

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Abstract

The invention relates to a non-noble metal coating bipolar plate in the field of proton exchange membrane fuel cells, a base body adopts a thin titanium plate, a coating adopts metal materials with excellent corrosion resistance, such as one or more of Nb, Zr and the like, the corrosion resistance is improved to a certain extent, and the contact resistance between the coating and a diffusion layeris greatly improved. Due to good mechanical properties and extremely small thickness of the metal, the metal can be subjected to punch forming, the internal resistance of the metal can be greatly reduced, and the mass and volume specific power of the galvanic pile are improved. Compared with the prior art, the process is simple, and batch production is easy to achieve. The coating and the base body are both made of metal, so that the bonding force is relatively strong.

Description

technical field [0001] The invention relates to a metal-coated bipolar plate in the field of proton exchange membrane fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a device that directly converts the chemical energy in hydrogen fuel and oxidant into electrical energy through electrode reaction. The product is only water, which has high energy conversion efficiency, no pollution, quick start, and long life. And high power density and other advantages, has been widely concerned by the world. [0003] As one of the key components of the proton exchange membrane fuel cell, the bipolar plate accounts for 40-50% of the total cost of the entire stack and 70-80% of the total mass. It plays the role of transporting gas, heat transfer and supporting the whole stack skeleton. Correspondingly, bipolar plates are required to have good electrical and thermal conductivity, low gas permeability, and high mechanical strength, and their harsh acidic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0206H01M8/0228C23C14/02C23C14/16C23C14/32
CPCC23C14/021C23C14/16C23C14/32H01M8/0206H01M8/0228H01M2008/1095Y02E60/50Y02P70/50
Inventor 邵志刚高正远曾亚超姚德伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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