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Fuel cell metal connector coating

A metal connector, fuel cell technology, applied in fuel cells, fuel cell parts, metal material coating processes, etc., can solve the problem of the decline of ion transmission efficiency of proton exchange membrane, the decline of fuel cell performance, and the increase of interface contact resistance. and other problems, to achieve the effect of improving the comprehensive working performance, reducing the growth rate and reducing the working resistance.

Pending Publication Date: 2021-10-26
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large size, high manufacturing cost and poor mechanical properties of traditional graphite bipolar plates, they are gradually replaced by metal bipolar plates with strong machinability, excellent electrical and thermal conductivity, and good mechanical properties.
However, in the acidic working environment of the battery, the metal plate is easy to corrode, and the metal ions formed during the corrosion process will lead to a decrease in the ion transmission efficiency of the proton exchange membrane. At the same time, the passivation film formed on the surface of the metal bipolar plate will increase the interface contact resistance. degraded fuel cell performance

Method used

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  • Fuel cell metal connector coating
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] will (Ti,Nb) 3 SiC 2 The coating is deposited on the surface of the SUS430 stainless steel connector. First prepare (Ti,Nb) 3 SiC 2 Bulk target and purchase commercial SUS430 stainless steel alloy. Use 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper to polish the alloy substrate step by step, and then pass the polished metal connector samples through acetone, alcohol and deionized water respectively. After ultrasonic cleaning for 15 min, dry in air for later use.

[0036] Coatings were deposited on the surface of the alloy using an arc ion plating apparatus. The arc ion plating device includes a rotary table, the upper surface of the rotary table is provided with a partition, the space above the rotary table is divided into several relatively independent spaces, the sample rack is arranged in the independent space, the column of the sample rack can rotate, and the column Can revolve with the turntable.

[0037] First hang the sample on the s...

Embodiment 2

[0040] Will (Ti,W) 3 SiC 2 The coating is deposited on the surface of the Crofer 22APU stainless steel connector. First prepare (Ti,W) 3 SiC 2 Bulk target and purchased commercial Crofer22APU stainless steel alloy. Use 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper to polish the alloy substrate step by step, and then pass the polished metal connector samples through acetone, alcohol and deionized water respectively. After ultrasonic cleaning for 10 min, dry in air for later use.

[0041] The coating is deposited on the surface of the alloy by using a magnetron sputtering equipment, and the sample is first suspended on the sample holder of the equipment (such as figure 1 shown), the column of the sample can rotate, and the rotating column can revolve with the turntable. Before coating preparation, pre-evacuated to 5×10 -4 Pa to minimize the contamination of residual gas during sputtering. After the vacuum degree required for the experiment was rea...

Embodiment 3

[0044] Ti 3 SiC 2 The coating is deposited on the surface of the Fe-17Cr-0.2Y stainless steel connector. First prepare Ti 3 SiC 2Bulk target and purchased commercial Fe-17Cr-0.2Y stainless steel alloy. Use 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper to polish the alloy substrate step by step, and then pass the polished metal connector samples through acetone, alcohol and deionized water respectively. After ultrasonic cleaning for 20 min, dry in air for later use.

[0045] The coating is deposited on the surface of the alloy using arc ion plating equipment, and the sample is first suspended on the sample holder of the equipment (e.g. figure 1 shown), the column of the sample can rotate, and the rotating column can revolve with the turntable. Before coating preparation, the vacuum chamber was pre-evacuated to a background vacuum of 5×10 -3 After Pa, a negative pulse bias voltage of 500V was applied to the substrate to perform backsplash cleaning ...

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Abstract

The invention belongs to the technical field of fuel cell materials. Aiming at the volatilization problem of an alloy connector Cr of a solid oxide fuel cell and the easy corrosion problem of a metal bipolar plate of a proton exchange membrane fuel cell, the invention provides a metal connector coating, the coating is Ti3SiC2 ceramic or doped modified solid solution material (Ti, M) 3SiC2, and M is selected from one of Nb, Ta, W and V materials. The coating is Ti3SiC2 ceramic or a modified solid solution material doped with the Ti3SiC2 ceramic, has the advantages of uniformity, compactness and high adhesive force, can effectively inhibit outward migration of Cr elements contained in a metal connector for a long time, solves the problem of cathode poisoning, can reduce the growth rate of a Cr2O3 film, reduces the working resistance of the connector, and improves the comprehensive working performance of the stainless steel connector; the coating can also be used for a metal bipolar plate of a proton exchange membrane fuel cell, and the corrosion resistance and the conductivity of the bipolar plate of the proton exchange membrane fuel cell are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, in particular to a metal connector coating of a fuel cell. Background technique [0002] Solid oxide fuel cells (Solid Oxide Fuel Cell, SOFC for short) have broad application prospects in the fields of distributed power station and power supply due to the advantages of using carbon-containing fuel, high power generation efficiency and low power generation cost. Although there are some battery stacks in demonstration operation around the world, their large-scale commercial application is still limited by the materials of each component. The linker material is one of the bottlenecks in the development of SOFC. The connector (also called connecting plate or bipolar plate) is the key component of the flat SOFC stack assembly. On the one hand, it electrically connects the adjacent single cells; on the other hand, it isolates the gas of the anode and the air of the cathode, and its perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0215H01M8/0228H01M8/0206C23C14/06C23C14/32C23C14/35
CPCH01M8/0206H01M8/0228H01M8/0215C23C14/35C23C14/325C23C14/06Y02E60/50
Inventor 郑莉莉李希超韦守李戴作强张洪信
Owner QINGDAO UNIV
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