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Fuel cell gaseous diffusion layer and process for producing fuel cell electrode and membrane electrode

A fuel cell electrode and gas diffusion layer technology, applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of poor gas diffusion performance and low current density of fuel cells, avoiding adverse effects and simple process , cost-saving effect

Active Publication Date: 2010-07-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] An object of the present invention is to provide a fuel cell with good gas diffusion performance and high current density of the fuel cell in order to overcome the disadvantage of poor gas diffusion performance of the fuel cell gas diffusion layer produced in the prior art, which leads to low current density of the fuel cell Preparation method of gas diffusion layer

Method used

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  • Fuel cell gaseous diffusion layer and process for producing fuel cell electrode and membrane electrode
  • Fuel cell gaseous diffusion layer and process for producing fuel cell electrode and membrane electrode
  • Fuel cell gaseous diffusion layer and process for producing fuel cell electrode and membrane electrode

Examples

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preparation example Construction

[0030] According to the preparation method of the fuel cell electrode provided by the present invention, the catalytic layer can adopt various catalytic layers conventionally used in the fuel cell field, and can be obtained by preparing a slurry of catalyst, solvent, and Nafion solution and then loading it on the gas diffusion layer. The loading method can be spray painting method, screen printing method, coating method, rolling method, printing method, casting method. The weight ratio of the catalyst, solvent and Nafion solution is preferably (1-20):(5-50):(1-10). The catalyst can be various catalysts commonly used for fuel cells such as platinum powder, platinum-containing alloy powder, platinum loaded on a carrier or platinum-containing alloy powder loaded on a carrier, or a cathode catalyst such as platinum powder or loaded on a carrier platinum powder on. The platinum-containing alloy contains platinum and one or more selected from ruthenium, tin, iridium, osmium and rhe...

Embodiment 1

[0035] This example is used to illustrate the preparation method of the gas diffusion layer provided by the present invention, the preparation method of the fuel cell electrode containing the gas diffusion layer, and the preparation method of the fuel cell membrane electrode.

[0036] Preparation of the gas diffusion layer: carbon paper for fuel cells (TORAY090, produced by Toray Corporation, Japan) was sintered at 340° C. for 90 minutes to remove impurities adsorbed in the carbon paper. Prepare the polytetrafluoroethylene emulsion of 15% by weight concentration, then put the carbon paper after sintering into it and soak for 4 times, take out after soaking for 9 minutes each time, and then soak for the next time after soaking for 4 times, then soak at 350 ℃ furnace for 50 minutes, and then cooled to room temperature. Add VXC-72 carbon black and polytetrafluoroethylene into water and mix to form a uniform slurry. The content of polytetrafluoroethylene in the slurry is 10% by we...

Embodiment 2

[0040] This example is used to illustrate the preparation method of the gas diffusion layer provided by the present invention, the preparation method of the fuel cell electrode containing the gas diffusion layer, and the preparation method of the fuel cell membrane electrode.

[0041] The fuel cell gas diffusion layer was prepared according to the method of Example 1, except that the carbon paper was used directly without sintering.

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Abstract

A preparation method for a fuel cell gas diffusion layer, comprising that the slurry with conductive agents and hydrophobic agents is evenly distributed onto support materials and the support materials with conductive agents and hydrophobic agents are sintered, the invention is characterized in that the method that the slurry with conductive agents and hydrophobic agents is evenly distributed onto support materials comprises that a pressure difference is formed on a first surface and a second surface of the supporting materials, the pressure on the second surface is larger than the pressure on the first surface, and the slurry with conductive agents and hydrophobic agents is contacted with the second surface of the supporting materials, the first surface and the second surface are respectively the two opposite surfaces of the supporting materials. The method provided by the invention has less operation steps and a simple process, and the diffusion layer which protects almost absolutely the porosity of the supporting materials can be obtained without extra open cell agents, and thus, the current density of the battery is nearly 43 percent higher than similar batteries.

Description

technical field [0001] The invention relates to a preparation method of a gas diffusion layer of a fuel cell and a preparation method of an electrode and a membrane electrode including the gas diffusion layer prepared by the method. Background technique [0002] A fuel cell is a device that generates electrical energy through an electrochemical reaction between fuel and an oxidizing gas such as oxygen or air. This battery has the advantages of high energy conversion efficiency, simple structure, low noise, abundant fuel sources, and no environmental pollution. Therefore, it has wide application prospects and is one of the ideal power supplies in the future. Fuel cells can be used as power sources for small portable power sources, small household power stations, electric vehicles, and submarines. [0003] In a fuel cell, the membrane electrode, which is the core component of the fuel cell, includes a proton exchange membrane and electrodes located on both sides of the proton...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M8/02H01M8/1004
CPCY02E60/50
Inventor 张日清贺光源董俊卿
Owner BYD CO LTD