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Composite coating for fuel cell polar plate and preparation method thereof

A fuel cell plate and composite coating technology, which is applied to fuel cell components, fuel cells, circuits, etc., can solve problems such as battery performance attenuation, improve durability and service life, enhance service performance, and ensure stability output effect

Pending Publication Date: 2020-04-10
SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a composite coating for a fuel cell pole plate and a preparation method thereof, which can enhance the drainage function of the fuel cell pole plate, so as to solve the battery performance caused by poor drainage of the metal pole plate of the fuel cell in the prior art Attenuation problem

Method used

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  • Composite coating for fuel cell polar plate and preparation method thereof
  • Composite coating for fuel cell polar plate and preparation method thereof
  • Composite coating for fuel cell polar plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select a mechanically formed metal plate with uniform thickness, and perform ultrasonic cleaning in ethanol and water to remove surface grease and surface debris; fix the metal plate of the fuel cell on the hanger, and transport it to the working place through the transmission guide rail. position; close the reaction chamber and evacuate its interior, when the vacuum is evacuated to 1Pa, turn on the heater for heating; when the temperature in the reaction chamber reaches the specified temperature, keep it warm for a period of time, and then pass through the gas path and air holes into the chamber Inject the reaction gas, and control the vacuum degree required by the process through the exhaust system, adjust the bias voltage and gas flow; use the reactive sputtering method to uniformly deposit a layer of Cr-C carbide (chromium carbide) conductive corrosion-resistant coating on the surface of the metal plate layer; then brush a layer of aqueous solution of nano-fluorine s...

Embodiment 2

[0029] Select a mechanically formed metal plate with uniform thickness, and perform ultrasonic cleaning in ethanol and water to remove surface grease and surface debris; use laser cladding to deposit a layer of W-C carbide (tungsten carbide) on the surface of the metal plate Conductive anti-corrosion coating; then send the metal pole plate with conductive anti-corrosion coating into the vacuum chamber, magnetron sputtering PTFE target, use the corresponding partition device to make the sputtered PTFE coating adhere to the metal pole In the channel bottom of the reaction area of ​​the plate and the distribution area of ​​the metal pole plate; the fuel cell pole plate with the composite coating of the present invention can be obtained.

[0030] The contact angle of the obtained hydrophobic material film layer is 123°, which is much higher than that of the conductive corrosion-resistant coating, and the surface properties of the hydrophobic material film layer have not occurred si...

Embodiment 3

[0032] A mechanically formed metal plate with a uniform thickness is selected and ultrasonically cleaned in ethanol and water to remove surface grease and surface debris; a layer of Ti-C carbide (titanium carbide) is deposited on the surface of the metal plate by reactive sputtering. ) Conductive anti-corrosion coating; Then utilize the gas spray gun, nano-SiO2 and nano-F-SiO 2 The ethanol dispersion liquid is evenly sprayed onto the distribution area of ​​the metal pole plate and the flow channel bottom of the reaction area; the fuel cell pole plate with the composite coating of the present invention can be obtained.

[0033] The contact angle of the obtained hydrophobic material film layer is 128°, which is much higher than that of the conductive corrosion-resistant coating, and the surface performance of the hydrophobic material film layer does not occur after being placed in an acidic solution with pH=3 for more than 200 hours and in the air for more than 1000 hours Signif...

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Abstract

The invention discloses a composite coating for a fuel cell polar plate and a preparation method of the composite coating. The composite coating comprises a conductive corrosion-resistant coating anda hydrophobic material film layer, the conductive corrosion-resistant coating is formed by compounding one or more of metal, metal carbide or carbon materials deposited on the surface of the fuel cellpolar plate; and the hydrophobic coating is a hydrophobic material film layer deposited on the upper surface of the conductive corrosion-resistant coating at the bottom of the runner groove of the reaction area and in the distribution area of the metal polar plate. The composite coating for the metal polar plate of the fuel cell can be maintained in a high-potential and acid environment, and hasthe advantages of complete structure and low possibility of oxidation; and water generated on the surface of the metal polar plate in the using process of the fuel cell stack is rapidly discharged, the durability of the metal polar plate is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cell metal pole plate coatings, in particular to a composite coating for enhancing the drainage performance of fuel cell pole plates and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFC, Proton exchange membrane fuel cells) is a power generation device that can efficiently convert hydrogen fuel and oxidant air directly into electrical energy through electrochemical reactions. The product is water, which is green and pollution-free. The core of PEMFC is the membrane electrode assembly (MEA) and the pole plate. MEA is the place of electrochemical reaction. The metal base plate has good electrical conductivity and thermal conductivity, and can realize batch molding. It plays an important role in realizing uniform distribution of gas and collecting current. significance. However, the use of metal flow field plates in proton exchange me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0202H01M8/0206H01M8/0228
CPCH01M8/0202H01M8/0206H01M8/0228Y02E60/50
Inventor 梅昊毕飞飞姜天豪蓝树槐彭林法
Owner SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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