Adsorption state of NO on Ir(111) surfaces under excess O 2 coexisting condition

H. Ikeda, Y. Koike, K. Shiratori, K. Ueda, N. Shirahata, Kazuhisa Isegawa, R. Toyoshima, S. Masuda, K. Mase, T. Nito, H. Kondoh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Iridium (Ir) exhibits a good efficiency for reduction of NO under excess O 2 coexisting conditions at temperatures higher than 250 °C. On the other hand, the advantage is lost at lower temperatures below 250 °C under O 2 existence, compared to any other platinum group metals. In this study, adsorption behavior of NO on Ir(111) single-crystal surfaces under excess O 2 coexisting conditions at the temperatures from room temperature to 250 °C has been studied by in-situ X-ray Photoelectron Spectroscopy (XPS). It is revealed that the coexisting O 2 induces formation of a high-density chemisorbed atomic oxygen (O) phase and the atomic O phase suppresses adsorption of NO at on-top sites significantly, which suggests that the suppression of NO adsorption causes a decrease in the ability of NO reduction at the lower temperatures.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalSurface Science
Publication statusPublished - 2019 Jul


  • In-situ observation
  • Ir(111)
  • NO adsorption
  • Oxygen effects

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


Dive into the research topics of 'Adsorption state of NO on Ir(111) surfaces under excess O 2 coexisting condition'. Together they form a unique fingerprint.

Cite this