Suppression of Oxygen Reduction Reaction Activity on Pt-Based Electrocatalysts from Ionomer Incorporation

Kazuma Shinozaki, Yu Morimoto, Bryan S. Pivovar, Shyam S. Kocha

Research output: Contribution to journalArticlepeer-review

121 Scopus Citations

Abstract

The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed.

Original languageAmerican English
Pages (from-to)745-751
Number of pages7
JournalJournal of Power Sources
Volume325
DOIs
StatePublished - 1 Sep 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5900-66820

Keywords

  • Ionomer coverage
  • Nafion ionomer
  • Oxygen reduction reaction
  • Platinum
  • Platinum alloy
  • Rotating disk electrode method

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