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Title: Impact of Polymer Electrolyte Membrane Degradation Products on Oxygen Reduction Reaction Activity for Platinum Electrocatalysts

The impact of model membrane degradation compounds on the relevant electrochemical parameters for the oxygen reduction reaction (i.e. electrochemical surface area and catalytic activity), was studied for both polycrystalline Pt and carbon supported Pt electrocatalysts. Model compounds, representing previously published, experimentally determined polymer electrolyte membrane degradation products, were in the form of perfluorinated organic acids that contained combinations of carboxylic and/or sulfonic acid functionality. Perfluorinated carboxylic acids of carbon chain length C1 – C6 were found to have an impact on electrochemical surface area (ECA). The longest chain length acid also hindered the observed oxygen reduction reaction (ORR) performance, resulting in a 17% loss in kinetic current (determined at 0.9 V). Model compounds containing sulfonic acid functional groups alone did not show an effect on Pt ECA or ORR activity. Lastly, greater than a 44% loss in ORR activity at 0.9V was observed for diacid model compounds DA-Naf (perfluoro(2-methyl-3-oxa-5-sulfonic pentanoic) acid) and DA-3M (perfluoro(4-sulfonic butanoic) acid), which contained both sulfonic and carboxylic acid functionalities.
 [1] ;  [2] ;  [2] ;  [1] ;  [2]
  1. Colorado School of Mines, Golden, CO (United States). Dept. of Chemistry and Geochemistry
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical Materials and Science Center
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0013-4651
Grant/Contract Number:
AC36-08GO28308; ZGB-0-4-647-1
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 161; Journal Issue: 14; Journal ID: ISSN 0013-4651
The Electrochemical Society
Research Org:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy Fuel Cell Technologies Office
Country of Publication:
United States
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE Chemical and Material Sciences; electrochemical; electrocatalysts; polymer electrolyte membrane fuel cells