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Gas diffusion layer with water retaining property for fuel cell, preparation method of gas diffusion layer, membrane electrode assembly and application

A gas diffusion layer and fuel cell technology, which is applied to fuel cell components, fuel cells, battery electrodes, etc., to achieve the effects of good water retention, reduced volatilization, and improved water retention and self-humidification.

Active Publication Date: 2014-07-30
武汉理工新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the air-cooled self-humidifying fuel cell stack and system working at normal pressure are very suitable, and the technology is very simple, but the only difficulty is that the membrane electrodes used must be self-humidifying.

Method used

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  • Gas diffusion layer with water retaining property for fuel cell, preparation method of gas diffusion layer, membrane electrode assembly and application
  • Gas diffusion layer with water retaining property for fuel cell, preparation method of gas diffusion layer, membrane electrode assembly and application
  • Gas diffusion layer with water retaining property for fuel cell, preparation method of gas diffusion layer, membrane electrode assembly and application

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Embodiment 1

[0039] This embodiment provides a method for preparing a fuel cell gas diffusion layer with water retention, which includes the following steps:

[0040] 1) Dilute the polytetrafluoroethylene emulsion (mass concentration is 80%) to 15%, then put the carbon paper 0.35mm thick into the prepared polytetrafluoroethylene (PTFE) emulsion for 8 minutes, take it out, and let it air in the air 10min, then put it into an oven at 100°C and dry it for 20min to obtain a pretreated hydrophobic carbon paper with a degree of hydrophobicity of 30%, which is set aside;

[0041] 2) 18.00 g of perfluorosulfonic acid resin (Nafion PFSA5% Dispersions D520 of Dupond Company) solution with a solid content of 10%, carbon powder 2.7 g, and deionized water 3.6 g are made into a hydrophilic layer solution for subsequent use; The mass percentage of perfluorosulfonic acid resin is 40%;

[0042] 3) Dilute the polytetrafluoroethylene emulsion to a mass fraction of 20%, take 6.88g graphitized carbon powder, ...

Embodiment 2

[0046] This embodiment provides a method for preparing a fuel cell gas diffusion layer with water retention, which includes the following steps:

[0047] 1) Dilute the polytetrafluoroethylene emulsion (mass concentration is 80%) to 15%, then put the carbon paper 0.35mm thick into the prepared polytetrafluoroethylene (PTFE) emulsion for 8 minutes, take it out, and let it air in the air 10min, then put it into an oven at 100°C and dry it for 20min to obtain a pretreated hydrophobic carbon paper with a degree of hydrophobicity of 30%, which is set aside;

[0048] 2) 18.00 g of perfluorosulfonic acid resin (Nafion PFSA5% Dispersions D520 of Dupond Company) solution with a solid content of 10%, carbon powder 7.2 g, and deionized water 3.6 g are made into a hydrophilic layer solution for subsequent use; The mass percentage of perfluorosulfonic acid resin is 20%;

[0049] 3) Dilute the polytetrafluoroethylene emulsion to a mass fraction of 20%, take 6.88g of graphitized carbon powde...

Embodiment 3

[0053] This embodiment provides a method for preparing a fuel cell gas diffusion layer with water retention, which includes the following steps:

[0054] 1) Dilute the polytetrafluoroethylene emulsion (mass concentration is 80%) to 15%, then put the carbon paper 0.35mm thick into the prepared polytetrafluoroethylene (PTFE) emulsion for 8 minutes, take it out, and let it air in the air 10min, then put it into an oven at 100°C and dry it for 20min to obtain a pretreated hydrophobic carbon paper with a degree of hydrophobicity of 30%, which is set aside;

[0055]2) 18.00 g of perfluorosulfonic acid resin (Nafion PFSA5% Dispersions D520 of Dupond Company) solution with a solid content of 10%, carbon powder 2.7 g, and deionized water 3.6 g are made into a hydrophilic layer solution for subsequent use; The mass percentage of perfluorosulfonic acid resin is 40%;

[0056] 3) Dilute the polytetrafluoroethylene emulsion to a mass fraction of 20%, take 6.88g of graphitized carbon powder...

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Abstract

The invention relates to a gas diffusion layer with water retaining property for a fuel cell, a preparation method of the gas diffusion layer, a membrane electrode assembly and application. The gas diffusion layer comprises a carbon paper base and a micro-porous layer, wherein the micro-porous layer is formed by a first hydrophobic layer closely adjacent to the carbon paper base, a hydrophilic layer and a second hydrophobic layer closely adjacent to a catalyst layer by overlaying in sequence, the thickness h2 of the hydrophilic layer is 1.5-2.5 times of the thickness h1 of the first hydrophobic layer, and the thickness h3 of the second hydrophobic layer is 2.5-3.5 times of the thickness h1 of the first hydrophobic layer. The gas diffusion layer can achieve good water retaining property, so as to reduce volatilization amount of liquid water and enable the membrane to be kept in a hydration status under a low-humidity condition; the membrane electrode prepared by the gas diffusion layer can be used for a self-humidifying pile, and is particularly used for the cathode side of an air cooling pile to improve the self-humidifying effect.

Description

technical field [0001] The present invention relates to the field of fuel cells, in particular to a water-retaining fuel cell gas diffusion layer, a preparation method thereof, a membrane electrode assembly and its application. The MEA assembled using the gas diffusion layer can well withstand low humidity working environments and is suitable for For self-humidifying stacks, especially air-cooled stacks. Background technique [0002] The research and preparation of self-humidifying membrane electrodes can provide a strong foundation for the popularization of air-cooled stacks in the future, and is of great significance to the development of fuel cell backup power base stations. [0003] Proton exchange membrane fuel cell (PEMFC) has attracted the attention of researchers because of its high energy density, fast start-up, clean and pollution-free. For PEMFCs with large output power such as commercial vehicles, external humidification is generally used and cooling water is us...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/88H01M8/0228H01M8/1004
CPCH01M4/8605H01M4/8807Y02E60/50
Inventor 徐云飞宛朝辉艾勇诚潘牧
Owner 武汉理工新能源有限公司
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