Method of making a proton exchange membrane using a gas diffusion electrode as a substrate

Patent metadata

Field	Value
Publication number	US-9899685-B2
Application number	US-201715458512-A
Country	US
Kind code	B2
Filing date	Mar 14, 2017
Priority date	Jan 11, 2008
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

One embodiment includes a method comprising the steps of providing a first dry catalyst coated gas diffusion media layer, depositing a wet first proton exchange membrane layer over the first catalyst coated gas diffusion media layer to form a first proton exchange membrane layer; providing a second dry catalyst coated gas diffusion media layer; contacting the second dry catalyst coated gas diffusion media layer with the first proton exchange membrane layer; and hot pressing together the first and second dry catalyst coated gas diffusion media layers with the wet proton exchange membrane layer therebetween.

First claim

What is claimed is:

1. A method comprising:
providing a first catalyst coated gas diffusion media layer comprising a first catalyst coating over a gas diffusion media layer;
depositing a wet first proton exchange membrane layer over the first catalyst coated gas diffusion media layer; and
providing a second catalyst coated gas diffusion media layer comprising a second catalyst coating over a second gas diffusion media layer, the second catalyst coated gas diffusion layer being disposed onto the wet first proton exchange membrane layer
wherein the first and second catalyst coated gas diffusion media layers each further includes a microporous layer with a hydrophobic material operatively configured to repel moisture in the first and second catalyst coated gas diffusion media layers.

2. The method as set forth in claim 1 further comprising interposing a subgasket material over the wet first proton exchange membrane layer before contacting the second catalyst coated gas diffusion media layer with the wet first proton exchange membrane layer.

3. The method as set forth in claim 1 further comprising the step of hot pressing the wet first proton exchange membrane layer formed over the first catalyst coated gas diffusion media layer together with the second catalyst coated gas diffusion media layer.

4. The method as set forth in claim 2 wherein the subgasket material extends past the edge of the first proton exchange membrane layer.

5. The method as set forth in claim 4 wherein the subgasket material further comprises an elastomer seal.

6. The method as set forth in claim 4 further comprising the step of hot pressing together the first wet proton exchange membrane layer formed over the first catalyst coated gas diffusion media layer, and the interposed subgasket material, and the second catalyst coated gas diffusion media layer.

7. A method comprising the steps of:
providing a first catalyst coated gas diffusion media layer comprising a first catalyst coating over a gas diffusion media layer, the first catalyst coating being a catalyst decal substrate; and
depositing a wet first proton exchange membrane layer over the first catalyst coated gas diffusion media layer.

8. The method as set forth in claim 7 further comprising the step of providing a second catalyst coated gas diffusion media layer comprising a second catalyst coating over a second gas diffusion media layer, the second catalyst coated gas diffusion layer being disposed onto the wet first proton exchange membrane layer.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Beutel Matthew J
• Fuller Timothy J

Classifications

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M4/8825 Primary

  Methods for deposition of the catalytic active composition · CPC title

• H01M4/8892

  Impregnation or coating of the catalyst layer, e.g. by an ionomer · CPC title

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M8/1069

  characterised by the manufacturing processes · CPC title