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Gas diffusion electrode, method for producing said electrode

A gas diffusion electrode and electrolyte technology, applied in solid electrolyte fuel cells, battery electrodes, final product manufacturing, etc.

Inactive Publication Date: 2005-03-30
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method of manufacturing electrodes is that, in addition to the excessively high content of polymer A (here Teflon) that renders the electrocatalyst layer hydrophobic, more than 50% (by weight relative to the catalyst paste) must be added infiltrant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The method of the present invention will be described in detail below according to a preferred embodiment.

[0031] To make the screen printing paste, carbon powder or catalyst powder is stirred in a screen printing medium such as polyethylene oxide dissolved in terpineol. The content of the binder is 0-20% (weight percent), preferably 5-15% (weight percent). Platinum black or carbon-based platinum can be used as a catalyst. Screen printing is carried out with an ordinary screen printing machine. The maximum size of the stainless steel mesh is 760×700 square millimeters, and its mesh is 100-300 mesh per inch (approximately 39-118 mesh per centimeter). In this way, a wet printing layer with a thickness of 6-60 microns can be obtained in each printing process. Each printing process can actually coat any area, the limit is only the printing area size of the screen printing machine. The electrodes were then dried at 120°C after the printing process and the binder was re...

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PUM

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Abstract

The invention relates to an improved gas diffusion electrode for use in PEM-fuel cells, to a method for producing said improved gas diffusion electrode and to a method for waterproofing a gas diffusion electrode. The fuel-cell catalyst layer of the improved gas diffusion electrode contains essentially less of the catalyst inhibitor Teflon3 since the Teflon3 is not just added to the screen-printing paste as has been the case up until now but is applied afterwards with the same surface-specific effect by dipping the finished fuel-cell catalyst layer in a solution containing Teflon.

Description

technical field [0001] The invention relates to a gas diffusion electrode for a PEM fuel cell and to a method of manufacturing the electrode as described in the preambles of the independent claims. Hydrophobization of the gas diffusion electrode can in particular be achieved with the production method. Background technique [0002] PEM( P olymer- E lektrolyt- M embran: polymer-electrolyte-membrane) The core part of the fuel cell is the membrane electrode unit, which consists of a membrane with electrodes on both sides, including an electrocatalyst layer. The electrode usually has a solid, gas-permeable and conductive carrier (carbon fiber fabric or carbon fiber paper), which is preferably hydrophobized with a polymer (this polymer is hereinafter referred to as polymer A, and the polymer it relates to For example, PTFE (polytetrafluoroethylene, Teflon). This support is coated with an electrocatalyst layer, which is also hydrophobic. Therefore, the polymer A is not only ...

Claims

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Application Information

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IPC IPC(8): B41M1/12H01M4/86H01M4/88H01M4/90H01M4/92H01M8/1004
CPCH01M4/8817H01M4/8835H01M4/926H01M4/8892H01M4/8807Y02E60/521H01M4/8882H01M4/8821H01M8/1004H01M4/928Y02P70/50Y02E60/50
Inventor 阿明·达茨巴巴拉·施里克曼弗雷德·韦达斯
Owner SIEMENS AG