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Gaseous diffusion layer for polymer electrolyte film fuel cell and preparation method thereof

A technology of gas diffusion layer and electrolyte membrane, which is applied to fuel cell parts, fuel cells, electrical components, etc., can solve the problems of ohmic polarization reduction, large concentration polarization of gas diffusion layer, etc., and achieve uniform distribution, Effect of improving mass transfer ability and conductivity, enhancing performance

Inactive Publication Date: 2009-01-21
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the gas diffusion layer has a large concentration polarization and ohmic polarization caused by the uneven distribution of hydrophobic materials in the carbon paper or carbon cloth of the existing gas diffusion layer, thereby reducing the performance of the fuel cell , and further provide a gas diffusion layer for a polymer electrolyte membrane fuel cell and a preparation method thereof

Method used

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  • Gaseous diffusion layer for polymer electrolyte film fuel cell and preparation method thereof
  • Gaseous diffusion layer for polymer electrolyte film fuel cell and preparation method thereof
  • Gaseous diffusion layer for polymer electrolyte film fuel cell and preparation method thereof

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specific Embodiment approach 1

[0009] Specific implementation mode 1: Combination figure 1 with figure 2 To illustrate this embodiment, the gas diffusion layer used in the polymer electrolyte membrane fuel cell of this embodiment is composed of a support layer 1 and a microporous layer 2. The microporous layer 2 covers the surface of the support layer 1, and the support The layer 1 is made of a hydrophobically treated porous material layer composed of a porous fiber layer and carbon nanowhiskers 4 grown on the fibers 3 of the porous fiber layer.

specific Embodiment approach 2

[0010] Specific implementation manner two: combination figure 2 To describe this embodiment, the difference between this embodiment and the first embodiment is that the porous fiber layer of this embodiment is made of carbon paper, carbon cloth or metal fiber mesh. With this arrangement, the hydrophobic material is more evenly distributed in the gas diffusion layer.

specific Embodiment approach 3

[0011] Specific implementation mode three: combination figure 2 To describe this embodiment, the difference between this embodiment and the first embodiment is: the porosity of the porous fibrous layer of this embodiment is 20%-95%, and the average pore diameter is greater than 1um. With this arrangement, the hydrophobic material is more evenly distributed in the gas diffusion layer.

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Abstract

The invention relates to a gaseous diffusion layer for a polymer electrolyte membrane fuel battery and a preparation method thereof, relating to a gaseous diffusion layer for a fuel battery and a preparation method thereof. The invention is capable of settling the problem of uneven distribution of carbon paper or hydrophobic material in the existing gaseous diffusion layer which degrades the performance of the fuel battery due to relatively big concentration polarization and ohm polarization of the gaseous diffusion layer. The porous-material layer in the gaseous diffusion layer comprises a porous fiber layer and carbon nano-palp growing on the fibers of the porous fiber layer. The preparation method of the invention includes the procedures that the porous fiber layer is rinsed and dried; nano-particles of cobalt, nickel or cobalt-nickel alloy are loaded onto the fiber surface; hydrophobic treatment is conducted; and the slurry is coated on the surface of the supporting layer and sintered. The hydrophobic materials of the gaseous diffusion layer are distributed evenly, as a result, the concentration polarization and the ohm polarization of the gaseous diffusion layer are lowered and the performance of the fuel battery is improved. Besides, the equipments needed by the method are simple and are easy to realize.

Description

Technical field [0001] The invention relates to a gas diffusion layer used in a fuel cell and a preparation method thereof. Background technique [0002] Fuel cell is a power generation method that directly converts chemical energy stored in fuel and oxidant into electrical energy through electrochemical reaction. It has outstanding advantages such as high efficiency and environmental friendliness. It is recognized as one of the key technologies to solve energy safety and environmental pollution. Polymer electrolyte membrane fuel cells have unique advantages such as fast start-up, fast load response, miniaturization, and flexible use. They have broad prospects in application fields such as electric vehicles and portable electronic devices. The polymer electrolyte membrane fuel cell is mainly composed of electrolyte membrane, catalytic layer, gas diffusion layer and flow field plate. The gas diffusion layer is located between the flow field plate and the catalytic layer. Its main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0245
CPCY02E60/50Y02P70/50
Inventor 杜春雨程新群尹鸽平史鹏飞王振波左朋建
Owner HARBIN INST OF TECH
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