Activity and Durability of Iridium Nanoparticles in the Oxygen Evolution Reaction

Shaun Alia, Kenneth Neyerlin, Bryan Pivovar, Brian Rasimick, Chilan Ngo, Svitlana Pylypenko, Hui Xu, Shyam Kocha

Research output: Contribution to journalArticlepeer-review

153 Scopus Citations


Unsupported iridium (Ir) nanoparticles, that serve as standard oxygen evolution reaction (OER) catalysts in acidic electrolyzers, were investigated for electrochemical performance and durability in rotating disk electrode (RDE) half-cells. Fixed potential holds and potential cycling were applied to probe the durability of Ir nanoparticles, and performance losses were found to be driven by particle growth (coarsening) atmoderate potential (1.4 to 1.6 V) and Irdissolution at higher potential (≥1.8 V). Several different commercially available samples were evaluated and standardized conditions for performance comparison are reported. The electrocatalyst RDE results have also been compared to results obtained for performance and durability in electrolysis cells.

Original languageAmerican English
Pages (from-to)F3105-F3112
JournalJournal of the Electrochemical Society
Issue number11
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© The Author(s) 2016.

NREL Publication Number

  • NREL/JA-5900-66915


  • electrocatalysis
  • electrolysis
  • iridium


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