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Processes, framed membranes and masks for forming catalyst coated membranes and membrane electrode assemblies

A membrane electrode assembly, catalyst technology, applied in the direction of electrical components, battery electrodes, fuel cell grouping, etc., can solve the problems of difficult large-scale manufacturing operations, drooling, loss and other issues

Active Publication Date: 2009-09-16
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, known methods are difficult to apply to large-scale manufacturing operations
Known coating techniques such as painting, patch coating, and screen printing are generally slow, can cause loss of valuable catalyst, and require relatively thick coatings to be applied
Furthermore, known spraying techniques suffer from various problems including, but not limited to: sagging, slumping, drooping, swelling and other problems associated with excessive "wetting" of the film

Method used

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  • Processes, framed membranes and masks for forming catalyst coated membranes and membrane electrode assemblies
  • Processes, framed membranes and masks for forming catalyst coated membranes and membrane electrode assemblies
  • Processes, framed membranes and masks for forming catalyst coated membranes and membrane electrode assemblies

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Embodiment approach

[0073] At this point in the manufacturing process, the membrane 8 is ready to form the cathode and anode catalyst layers. According to an exemplary embodiment of the present invention, the membrane 8 has preferably been pretreated with a bath of acid and hot water, a hot water bath, or only an acid bath, or according to another method a bath of hydrogen peroxide, sulfuric acid and distilled water, and positioned On frame 60 preferably removably secured to platen 64 by vacuum. Platen 64 provides a firm fixture for membrane 8 and preferably includes fiducials, pins, pegs, pilot holes, and / or other markings that may be used by catalyst spraying equipment (and other equipment used to form the MEA) to identify membrane 8 and determine substantially exact positions thereon. Thus, the anode and cathode layers 6, 8 can be coated on the membrane 8 substantially accurately, such as within ± about 1 mm, ± about 0.5 mm, or ± about 0.2 mm, according to exemplary embodiments of the present...

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Abstract

A process for preparing catalyst coated membranes and membrane electrode assemblies for use in direct methanol fuel cells is provided. Cathode and anode layers are formed by spraying catalyst-containing inks onto a novel framed electrolytic membrane to form a catalyst coated membrane. The spraying process optionally employs one or more masks, which carefully control where the catalyst-containing ink is deposited. Following application of the cathode and anode layers, diffusion layers are prepared and inserted onto the catalyst coated membranes, and pressed to form membrane electrode assemblies.

Description

technical field [0001] The present invention relates to the manufacture of fuel cells. More specifically, the present invention relates to systems and methods for fabricating membrane electrode assemblies for direct methanol fuel cells. Background technique [0002] A fuel cell is an electrochemical cell that converts reactants, fuel and oxidant fluid streams, to produce electricity and reaction products. Many reactants can be used in fuel cells and such reactants can be delivered in gaseous or liquid streams. For example, the fuel stream may be substantially pure hydrogen, a reformate stream containing gaseous hydrogen, or an aqueous alcohol such as methanol in a direct methanol fuel cell (DMFC). The oxidizing agent may, for example, be substantially pure oxygen or a dilute oxygen stream such as air. [0003] The use of fuel cells as vehicle power is considered an important step towards reducing dependence on oil, and as such, there is currently a great deal of interest ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10H01M8/24H01M4/88H01M4/86
CPCH01M8/246H01M4/886H01M4/8817H01M8/0273H01M8/0297H01M4/8615H01M8/1011Y02E60/523H01M8/242Y02E60/50H01M4/881H01M4/88H01M8/02H01M4/8825
Inventor 格雷戈里·A·罗姆尼戈登·L·赖斯罗斯·A·米塞姆詹姆斯·H·布鲁斯特施迈茨·斯科特奥林保利纳·阿塔纳索瓦
Owner CABOT CORP
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