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Title: Grafted functional groups on expanded tetrafluoroethylene (ePTFE) support for fuel cell and water transport membranes

A method for forming a modified solid polymer includes a step of contacting a solid fluorinated polymer with a sodium sodium-naphthalenide solution to form a treated fluorinated solid polymer. The treated fluorinated solid polymer is contacted with carbon dioxide, sulfur dioxide, or sulfur trioxide to form a solid grafted fluorinated polymer. Characteristically, the grafted fluorinated polymer includes appended CO.sub.2H or SO.sub.2H or SO.sub.3H groups. The solid grafted fluorinated polymer is advantageously incorporated into a fuel cell as part of the ion-conducting membrane or a water transport membrane in a humidifier.
Inventors:
;
Issue Date:
OSTI Identifier:
1340532
Assignee:
GM GLOBAL TECHNOLOGY OPERATIONS LLC (Detroit, MI) DOEEE
Patent Number(s):
9,553,327
Application Number:
14/586,132
Contract Number:
EE0000470
Resource Relation:
Patent File Date: 2014 Dec 30
Research Org:
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Other works cited in this record:

Humidifier for use with a fuel cell
patent, October 2002

Thermal management system and method for vehicle electrochemical engine
patent, May 2006

Fuel cell-use humidifier
patent, January 2007

Fuel reformer system with improved water transfer
patent, August 2009

Fabrication and characterization of PFSI/ePTFE composite proton exchange membranes of polymer electrolyte fuel cells
journal, April 2007

Through-Plane Proton Transport Resistance of Membrane and Ohmic Resistance Distribution in Fuel Cells
journal, January 2009
  • Jiang, Ruichun; Mittelsteadt, Cortney K.; Gittleman, Craig S.
  • Journal of The Electrochemical Society, Vol. 156, Issue 12, p. B1440-B1446
  • DOI: 10.1149/1.3240877

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