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

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

doi:10.1021/jz500610u

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 journal › Article › peer-review

467 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	1636-1641
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	5
Issue number	10
DOIs	https://doi.org/10.1021/jz500610u
State	Published - May 15 2014
Externally published	Yes

Keywords

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

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10.1021/jz500610u

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Orientation-dependent oxygen evolution activities of rutile IrO ₂ and RuO ₂ . / Stoerzinger, Kelsey A.; Qiao, Liang; Biegalski, Michael D. et al.
In: Journal of Physical Chemistry Letters, Vol. 5, No. 10, 15.05.2014, p. 1636-1641.

Research output: Contribution to journal › Article › peer-review

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abstract = " 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.",

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