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Flow field plate for fuel cell or water electrolytic cell and preparation method and application thereof

A water electrolysis cell and fuel cell technology, applied in the field of materials, can solve the problems of increasing system complexity and low utilization rate of reaction gas, and achieve the effect of improving utilization rate

Inactive Publication Date: 2019-06-07
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

In these flow fields, the generated water in the battery is purged out of the stack by high gas flow rate, and the power of water transmission comes from the gas purge, so the gas flow rate is required to be fast, that is, the reaction gas and the generated water have a high stoichiometry Ratio, the utilization rate of the reaction gas is very low, or a gas circulation pump needs to be installed
In addition, the reaction gas of the fuel cell needs to be humidified to improve its reaction performance, and an external humidification tank is usually required, which will undoubtedly increase the complexity of the system

Method used

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  • Flow field plate for fuel cell or water electrolytic cell and preparation method and application thereof
  • Flow field plate for fuel cell or water electrolytic cell and preparation method and application thereof
  • Flow field plate for fuel cell or water electrolytic cell and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 Copper porous foam net flow field plate

[0035] Take a foamed copper mesh with a thickness of 0.1 mm and a median pore size of 1 μm, and apply a layer of silicon dioxide hydrophilic layer to the hole surface of the copper porous mesh by wet chemical method. The wetting angle of the obtained hydrophilic layer is 5 degrees.

[0036] Obtain the porous mesh flow field plate used for fuel cells, denoted as sample 1 # .

Embodiment 2

[0037] Embodiment 2 carbon fiber porous mesh flow field plate

[0038] Take a carbon fiber porous mesh with a thickness of 1 cm and a median pore size of 100 μm, and apply a layer of hydrophilic graphene to the pores of the carbon fiber porous mesh by vacuum ion plating to obtain a hydrophilic layer. The wetting angle is 60 degrees.

[0039] Obtain the porous net flow field for the water electrolysis cell, denoted as sample 2 # .

Embodiment 3

[0040] Embodiment 3 stainless steel porous braided mesh flow field plate

[0041] Take a stainless steel braided mesh with a thickness of 5 mm and a median pore size of 50 μm, deposit a layer of noble metal platinum on the porous stainless steel mesh by pulse electrodeposition, and roughen the surface by ion beam bombardment to obtain a hydrophilic layer. The wet angle is 10 degrees, put one end into the water, and the wet height reaches 8cm within 1min.

[0042] Obtain the described porous mesh flow field for fuel cell, denoted as sample 3 # .

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Abstract

The invention discloses a flow field plate for a fuel cell or a water electrolytic cell. The flow field plate comprises a porous mesh, wherein the surface of the porous mesh is hydrophilic or the surface of the porous mesh is provided with a hydrophilic layer. By applying a flow field formed by the flow field plate, water is stored in mesh pores under the action of capillary adsorption and is directionally conducted under the action of surface tension by taking the activity difference as a driving force, thereby enabling the porous mesh to have the functions of water storage and directional water conduction, and thus achieving an effect of humidifying the fuel cell or discharging the generated water. The invention further discloses a preparation method of the flow field plate and a fuel cell or an electrolyte cell applying the above process.

Description

technical field [0001] The application relates to a flow field plate used for a fuel cell or a water electrolysis cell, and belongs to the field of materials. Background technique [0002] With the depletion of fossil energy, environmental pollution and climate change, clean energy has attracted great attention from all over the world. Fuel cells have the advantages of cleanliness, high efficiency, high power density, and low-temperature fast start-up, and are widely used in military fields, vehicle power supplies, and distributed power generation. Hydrogen production by electrolysis of water also plays an important role in the fields of energy and chemical industry. [0003] Most of the existing fuel cell flow fields are flow fields formed by engraving flow channels on the surface of carbon-based materials, or flow fields formed by pasting graphite sheets with flow channels on the surface of flat metal plates, or flow fields formed by metal The plate is pressed to form a ...

Claims

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Application Information

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IPC IPC(8): H01M8/0245H01M8/04828
CPCY02E60/50
Inventor 谢峰俞红梅韦世慧刘凯邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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