Orientation-dependent oxygen evolution activities of rutile IrO 2 and RuO 2

Kelsey A. Stoerzinger, Liang Qiao, Michael D. Biegalski, Yang Shao-Horn

Research output: Contribution to journalArticlepeer-review

427 Scopus citations


The activities of the oxygen evolution reaction (OER) on IrO 2 and RuO 2 catalysts are among the highest known to date. However, the intrinsic OER activities of surfaces with defined crystallographic orientations are not well-established experimentally. Here we report that the (100) surface of IrO 2 and RuO 2 is more active in alkaline environments (pH 13) than the most thermodynamically stable (110) surface. The OER activity was correlated with the density of coordinatively undersaturated metal sites of each crystallographic facet. The surface-orientation-dependent activities can guide the design of nanoscale catalysts with increased activity for electrolyzers, metal-air batteries, and photoelectrochemical water splitting applications.

Original languageEnglish (US)
Pages (from-to)1636-1641
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number10
StatePublished - May 15 2014
Externally publishedYes


  • alkaline
  • iridium oxide
  • oxygen electrocatalysis
  • ruthenium oxide
  • rutile
  • thin films
  • water splitting


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