Preparation method for metal base fuel battery bipolar plate with hydrophobicity

A fuel cell and metal-based technology, which is applied to fuel cell components, battery electrodes, metal material coating technology, etc., can solve the problems of battery performance degradation, easy accumulation of water and gas, flow field blockage, etc., and achieve simple process, Good electrical conductivity and water repellency, excellent corrosion resistance effect

Inactive Publication Date: 2009-12-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the flow field on the bipolar plate is relatively narrow, after the humidified gas enters the flow field, water vapor is easy to condense on the wall of the flow field, and is not easy to be blown away by the gas. After a long time, part of the flow field is seriously blocked and the air flow is not smooth. , the performance of the battery is reduced, and it may even cause the battery to be overheated and burn out.

Method used

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  • Preparation method for metal base fuel battery bipolar plate with hydrophobicity
  • Preparation method for metal base fuel battery bipolar plate with hydrophobicity
  • Preparation method for metal base fuel battery bipolar plate with hydrophobicity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 Shown, the preparation method of the metal-based fuel cell bipolar plate with hydrophobicity, it comprises the steps:

[0029]1) Take a 304 stainless steel plate with a flow field and perform surface polishing treatment to obtain a polished metal plate with a flow field.

[0030] 2) Prepare a dense film: Put the polished metal plate with a flow field into a magnetron sputtering furnace for coating, select a Cr target, the temperature is 180 °C, and the vacuum degree is 2.0×10 -1 Pa, current 18A, voltage 300V, Ar / N 2 The gas volume flow ratio is 2:1, the coating time is 1.5 hours, a layer of dense CrN film is formed on the surface of the metal plate with a flow field, and a metal plate with a dense film is obtained.

[0031] 3) Prepare a thin film with nano-protrusions: the metal plate with a dense thin film obtained in step 2) is put into a magnetron sputtering furnace for coating, and the Cr 3 Ni 2 target, the temperature is 180°C, the vacuum degree i...

Embodiment 2

[0035] like figure 1 Shown, the preparation method of the metal-based fuel cell bipolar plate with hydrophobicity, it comprises the steps:

[0036] 1) Take a 304 stainless steel plate with a flow field and perform surface polishing treatment to obtain a polished metal plate with a flow field.

[0037] 2) Prepare a dense film: put the polished metal plate with a flow field into a magnetron sputtering furnace for coating, select a Cr target, the temperature is 220 °C, and the vacuum degree is 2.3×10 -1 Pa, current 16A, voltage 500V, Ar / N 2 The gas volume flow ratio is 3:1, the coating time is 1 hour, a layer of dense CrN film is formed on the surface of the metal plate with a flow field, and a metal plate with a dense film is obtained.

[0038] 3) Prepare a thin film with nano-protrusions: the metal plate with a dense thin film obtained in step 2) is put into a magnetron sputtering furnace for coating, and the Cr 3 Ni 2 target, the temperature is 220°C, the vacuum degree is ...

Embodiment 3

[0042] like figure 1 Shown, the preparation method of the metal-based fuel cell bipolar plate with hydrophobicity, it comprises the steps:

[0043] 1) Take a 304 stainless steel plate with a flow field and perform surface polishing treatment to obtain a polished metal plate with a flow field.

[0044] 2) Prepare a dense film: put the polished metal plate with a flow field into a magnetron sputtering furnace for coating, select a Cr target, the temperature is 220°C, and the vacuum degree is 2.1×10 -1 Pa, current 17A, voltage 400V, Ar / N 2 The gas volume flow ratio is 2:1, the coating time is 2 hours, a layer of dense CrN film is formed on the surface of the metal plate with a flow field, and a metal plate with a dense film is obtained.

[0045] 3) Prepare a thin film with nano-protrusions: the metal plate with a dense thin film obtained in step 2) is put into a magnetron sputtering furnace for coating, and the Cr 3 Ni 2 target, the temperature is 220°C, the vacuum degree is ...

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Abstract

The invention relates to a preparation method for a metal base fuel battery bipolar plate with hydrophobicity. The preparation method for the metal base fuel battery bipolar plate with hydrophobicity is characterized in that the method comprises the following steps: (1) surface polishing treatment is carried out on a metal plate with flow field as to obtain the polished metal plate with flow field; (2) a layer of compact thin film is prepared on the surface of the polished metal plate with flow field so as to obtain the metal plate with the compact thin film; (3) a layer of thin film with nanometer micro-convex is deposited on the surface of the metal plate with the compact thin film to obtain a metal plate with the compact thin film and nanometer micro-convex thin film; (4) electrical conductivity regulation is carried out on the surface the metal plate with the compact thin film and nanometer micro-convex thin film to prepare a layer of film with good electrical conductivity inheriting micro-convex structure, thus obtaining the metal base fuel battery bipolar plate with hydrophobicity. The metal base fuel battery bipolar plate prepared by the method not only has excellent corrosion resistance, but also has good electrical conductivity and hydrophobicity.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic metal-based fuel cell bipolar plate. Background technique [0002] Proton membrane fuel cells have the characteristics of cleanness, high efficiency, mobility, and mild operating conditions, and have important application values ​​in the fields of transportation, aerospace, and electronic communications. A bipolar plate is a plate material that connects single cells in series, and needs to meet various performance requirements. That is, good electrical conductivity, excellent corrosion resistance (including acid corrosion, oxidative moisture corrosion, electrode potential corrosion), good air tightness, sufficient mechanical strength, low density and relatively low cost. [0003] The currently used bipolar plate material is graphite, which is mainly based on graphite's good electrical conductivity, corrosion resistance, and oxidation resistance. However, due to the poor mechanical properti...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/88C23C14/35C23C14/06
CPCY02E60/50
Inventor 张东明
Owner WUHAN UNIV OF TECH
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