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Inorganic Chemistry – Electronic Structure Group
  

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Axel Knop-Gericke
 
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Highlights:
Iridium oxides in the oxygen evolution reaction

XPS and NEXAFS combined with theoretical calculations reveal that multiple O and Ir species
are present in OER active amorphous iridium oxide catalysts. The observed electronic defects
(OI- and IrIII) in the near-surface region of the cationic and anionic framework are likely critical
for the enhanced activity of amorphous iridium oxides.

Combining experiment and theory

Introducing an Ir vacancy into a rutile-type structure mimics hole doping and leads to the
formation of OI- and IrIII spieces. This defect model recovers the additional XPS and NEXFAS
features of the amorphous IrOx.

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