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, Ryo Toyoshima, S. Masuda, K. Mase, T. Nito, Hiroshi Kondoh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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
Volume685
DOIs
Publication statusPublished - 2019 Jul 1

Fingerprint

Iridium
iridium
Adsorption
adsorption
crystal surfaces
Temperature
platinum
Single crystal surfaces
retarding
photoelectron spectroscopy
Platinum
causes
single crystals
room temperature
oxygen
metals
X ray photoelectron spectroscopy
Metals
Oxygen
x rays

Keywords

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

ASJC Scopus subject areas

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

Cite this

Adsorption state of NO on Ir(111) surfaces under excess O 2 coexisting condition . / Ikeda, H.; Koike, Y.; Shiratori, K.; Ueda, K.; Shirahata, N.; Isegawa, Kazuhisa; Toyoshima, Ryo; Masuda, S.; Mase, K.; Nito, T.; Kondoh, Hiroshi.

In: Surface Science, Vol. 685, 01.07.2019, p. 1-6.

Research output: Contribution to journalArticle

Ikeda, H, Koike, Y, Shiratori, K, Ueda, K, Shirahata, N, Isegawa, K, Toyoshima, R, Masuda, S, Mase, K, Nito, T & Kondoh, H 2019, ' Adsorption state of NO on Ir(111) surfaces under excess O 2 coexisting condition ', Surface Science, vol. 685, pp. 1-6. https://doi.org/10.1016/j.susc.2019.01.015
Ikeda, H. ; Koike, Y. ; Shiratori, K. ; Ueda, K. ; Shirahata, N. ; Isegawa, Kazuhisa ; Toyoshima, Ryo ; Masuda, S. ; Mase, K. ; Nito, T. ; Kondoh, Hiroshi. / Adsorption state of NO on Ir(111) surfaces under excess O 2 coexisting condition In: Surface Science. 2019 ; Vol. 685. pp. 1-6.
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AU - Shirahata, N.

AU - Isegawa, Kazuhisa

AU - Toyoshima, Ryo

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AB - 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.

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