Novel Intermetallic Catalysts to Enhance PEM Membrane Durability

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The research examined possible sources of degradation of platinum based anode catalysts under long term use. Scientists at the United Technologies Research Center had shown that the anode as well as the cathode catalysts degrade in hydrogen fuel cells. This goal of this research was to see if mechanisms of anode degradation could be understood using forefront electrochemical techniques in an aqueous system. We found that this method is limited by the very low levels of impurities (perhaps less than a part per trillion) in the electrolyte. This limitation comes from the relatively small catalyst surface area (a few sq ... continued below

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DiSalvo, Francis J. January 6, 2009.

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Description

The research examined possible sources of degradation of platinum based anode catalysts under long term use. Scientists at the United Technologies Research Center had shown that the anode as well as the cathode catalysts degrade in hydrogen fuel cells. This goal of this research was to see if mechanisms of anode degradation could be understood using forefront electrochemical techniques in an aqueous system. We found that this method is limited by the very low levels of impurities (perhaps less than a part per trillion) in the electrolyte. This limitation comes from the relatively small catalyst surface area (a few sq cm or less) compared to the electrolyte volume of 10 to 25 ml. In real fuel cells this ratio is completelyreversed: high catalyst surface area and low electrolyte violume, making the system much less sensitive to impurities in the electrolyte. We conclude that degradation mechanisms should be studied in real fuel cell systems, rather than in ex-situ, large electrolyte volume experiments.

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  • Report No.: DOE/ER/46259-1
  • Grant Number: FG02-05ER46259
  • DOI: 10.2172/944969 | External Link
  • Office of Scientific & Technical Information Report Number: 944969
  • Archival Resource Key: ark:/67531/metadc894369

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  • January 6, 2009

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 7, 2016, 3:31 p.m.

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DiSalvo, Francis J. Novel Intermetallic Catalysts to Enhance PEM Membrane Durability, report, January 6, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc894369/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.