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Method for preparing self-supporting electrode by using porous carrier of electrode catalyst for fuel cell and membrane electrode assembly containing the electrode

A fuel cell and electrode assembly technology, which is applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of durability degradation and complicated manufacturing methods, and achieve easy mass production, reduce flooding phenomenon, and easy mass production Membrane-electrode assembly effects

Inactive Publication Date: 2009-06-10
HANWHA CHEMICAL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a metal mesh is used, there is a problem of deterioration in durability due to metal corrosion, and when an electrode including an adsorptive porous material is used in a through-hole inside the electrode substrate, there is a disadvantage that the manufacturing method is complicated

Method used

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  • Method for preparing self-supporting electrode by using porous carrier of electrode catalyst for fuel cell and membrane electrode assembly containing the electrode
  • Method for preparing self-supporting electrode by using porous carrier of electrode catalyst for fuel cell and membrane electrode assembly containing the electrode
  • Method for preparing self-supporting electrode by using porous carrier of electrode catalyst for fuel cell and membrane electrode assembly containing the electrode

Examples

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Effect test

Embodiment 1

[0039] (1) Preparation of catalyst ink

[0040] 40% by weight of Pt / C (Tanaka Kikinzoku Kogyo Kabushiki Kaisha) / water / isopropanol / ionomer (20% Nafion solution) is based on known literature (J.H.Kim et al., J.PowerSources 135 (2004) 29.) Mixed at a mixing ratio of 1:6:6:6 wt% / wt%, and then placed in a bath maintained at 4°C, where it was stirred with a homogenizer at 10,000 RPM for 2 hours. The prepared catalyst ink was aged for 24 hours and ultrasonicated for 10 minutes before being applied. The viscosity of the prepared catalyst ink was 200 cp, and the d50 value of the secondary diameter of the catalyst particles was 0.65 μm.

[0041] (2) Coating of catalyst ink

[0042] A non-conductive porous substrate (a mixture of viscose fiber / polyester (DuPont Company, product name: Sontara), 85% porosity, average pore size 4 μm) having a thickness of 20 μm was placed on the lower plate and heated at 70° C. device and coated both sides with the prepared catalyst ink. When coating, t...

Embodiment 2

[0048] A membrane-electrode assembly was prepared in the same manner as shown in Example 1, and unit cells were joined. However, a porous substrate with a thickness of 5 μm was used.

Embodiment 3

[0050] A membrane-electrode assembly was prepared in the same manner as shown in Example 1, and unit cells were joined. However, a porous substrate with a thickness of 10 μm was used.

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Abstract

The present invention relates to a method for producing self-support electrode by using porous support of electrode catalyst for fuel cell, and a membrane electrode assembly including the electrode. The invention also relates to a porous electrode for polymer electrolyte membrane fuel cell, in particular relates to a method for producing membrane-electrode assembly by using process of: coating the catalyst ink on a non-conductive substrate with macropore to form a self-support electrode layer, connecting the above onto the polymer electrolyte membrane. The porous self-support electrode of the invention smoothly discharge and feed moisture and gas at a high-pressure flow density operation zone such that capability of the fuel cell is improved, and the process of producing the membrane-electrode assembly is simplified by arbitrary cutting.

Description

technical field [0001] The present invention relates to porous electrodes for use in polymer electrolyte membrane fuel cells, and more particularly to a method for preparing a membrane-electrode assembly by coating a catalyst ink on a non-conductive substrate with large pores to form The electrode layer is self-standing, which is then attached to the polymer electrolyte membrane. The porous self-supporting electrode according to the present invention allows water and gas to be discharged and flowed smoothly in the high current density operating region to improve the performance of the fuel cell, and can be cut at will to simplify the preparation process of the membrane-electrode assembly. Background technique [0002] A fuel cell is a device that converts the chemical energy of the fuel directly into electrical energy by reacting an electrochemically reactive fuel such as hydrogen or methanol with oxygen, without going through the Carnot cycle, unlike existing thermal power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/02H01M8/10
CPCH01M4/8828H01M2008/1095H01M8/1004Y02E60/522Y02E60/50Y10T29/49108Y02P70/50H01M4/86H01M4/88H01M4/90
Inventor 金荣泽徐民浩张炳哲柳东桓杨祯恩郑隋
Owner HANWHA CHEMICAL CORPORATION
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