Water Oxidation Catalysis via Size-Selected Iridium Clusters

Avik Halder, Cong Liu, Zhun Liu, Jonathan Daniel Emery, Michael J. Pellin, Larry A. Curtiss, Peter Zapol, Stefan Vajda, Alex B.F. Martinson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The detailed mechanism and efficacy of four-electron electrochemical water oxidation depend critically upon the detailed atomic structure of each catalytic site, which are numerous and diverse in most metal oxides anodes. In order to limit the diversity of sites, arrays of discrete iridium clusters with identical metal atom number (Ir2, Ir4, or Ir8) were deposited in submonolayer coverage on conductive oxide supports, and the electrochemical properties and activity of each was evaluated. Exceptional electroactivity for the oxygen evolving reaction (OER) was observed for all cluster samples in acidic electrolyte. Reproducible cluster-size-dependent trends in redox behavior were also resolved. First-principles computational models of the individual discrete-size clusters allow correlation of catalytic-site structure and multiplicity with redox behavior.

Original languageEnglish (US)
Pages (from-to)9965-9972
Number of pages8
JournalJournal of Physical Chemistry C
Issue number18
StatePublished - May 10 2018

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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