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Water vapor transport membrane

A technology for water vapor and membrane transport, applied in the field of membrane humidifiers, which can solve the problems of high proton conduction resistance and high ohmic voltage loss

Inactive Publication Date: 2013-04-10
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, lower water content in the membrane results in higher proton conduction resistance and thus higher ohmic voltage losses

Method used

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  • Water vapor transport membrane
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Examples

Experimental program
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example 1

[0062] Membranes were fabricated using different perfluorosulfonic acid (PFSA) ionomers using the method described below. PFSA ionomers are Nafion™ DE2020 (available from DuPont), Aquivion™ 85-15 (available from Solvay-Solexis), and Aquivion™ D70-20BS (available from Solvay-Solexis).

[0063] Aquivion® D70-20BS PFSA ionomer aqueous dispersions (20 wt%) were diluted with isopropanol or DMAc to 15, 12.5, 10 and 5 wt% solids. The dispersion was coated onto a fluorinated ethylene-propylene (FEP) coated polyimide film backing material (eg, Kapton® 120FN616, 1 mil, available from DuPont) and covered with ePTFE. The composite was dried on a heated platen or oven at 50°C and then heated in an oven at 80°C for 1 hour. The liner was removed and the resulting WVT films were tested for water vapor transmission.

[0064] The ionic polymer dispersion was applied to the backing material using a 3 mil Bird applicator. Other coating methods may also be used including, but not limited to, re...

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Abstract

A water vapor transport membrane for a membrane humidifier and a method for making the water vapor transport membrane are described. A method of making a water vapor transport membrane. In one embodiment, the method includes diluting a PFSA ionomer dispersion with a solvent; combining a layer of the diluted PFSA ionomer dispersion with a membrane support layer; and drying the PFSA layer forming the water vapor transport membrane, the water vapor transport membrane having a beginning of life water vapor transfer of at least about 12,000 GPU, wherein the substrate is a backer and removed.

Description

technical field [0001] The present invention relates to fuel cells, and more particularly, to membrane humidifiers for fuel cells. Background technique [0002] Electrochemical conversion cells, commonly referred to as fuel cells, generate electrical energy by processing first and second reactants, such as by oxidation and reduction of hydrogen and oxygen. By way of example and not limitation, a typical polymer electrolyte fuel cell includes a polymer membrane (eg, a proton exchange membrane) positioned between a pair of catalyst layers, with a pair of gas diffusion media layers outside the catalyst layers. The cathode plate and the anode plate are located on the outermost side adjacent to the gas diffusion medium layer, and the aforementioned members are tightly compressed to form a battery cell. [0003] The voltage provided by a single battery cell is often too small for useful applications. Accordingly, multiple cells are often arranged in a "stack" and connected in se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/02
CPCB01D69/02B01D69/12B01D71/32H01M8/04149H01M2008/1095Y02P70/50Y02E60/50
Inventor A.M.布伦纳T.J.富勒L.邹
Owner GM GLOBAL TECH OPERATIONS LLC