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

doi:10.1016/j.susc.2019.01.015

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

Department of Chemistry

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

6 Citations (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 language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Surface Science
Volume	685
DOIs	https://doi.org/10.1016/j.susc.2019.01.015
Publication status	Published - 2019 Jul

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

Access to Document

10.1016/j.susc.2019.01.015

Cite this

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, 685, 1-6. https://doi.org/10.1016/j.susc.2019.01.015

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

@article{899dd908bf79414e90ae401a2a742a98,

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

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. ",

keywords = "In-situ observation, Ir(111), NAP-XPS, NO adsorption, Oxygen effects",

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

note = "Funding Information: We thank the Photon Factory staffs for their technical supports. This study was supported partly by the Grants-in-Aid for scientific research (Nos. 20245004 and 26248008). The experiments were performed as the facility use at the Photon Factory (2015Y031). We thank Dr E. Mitsuda, Dr T. Baba, and Dr Y. Kawamura of Toyota Motor Corporation, for assistance with the computational modeling in this study. Funding Information: We thank the Photon Factory staffs for their technical supports. This study was supported partly by the Grants-in-Aid for scientific research (Nos. 20245004 and 26248008). The experiments were performed as the facility use at the Photon Factory (2015Y031). We thank Dr E. Mitsuda, Dr T. Baba, and Dr Y. Kawamura of Toyota Motor Corporation , for assistance with the computational modeling in this study. ",

year = "2019",

month = jul,

doi = "10.1016/j.susc.2019.01.015",

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T1 - Adsorption state of NO on Ir(111) surfaces under excess O 2 coexisting condition

AU - Ikeda, H.

AU - Koike, Y.

AU - Shiratori, K.

AU - Ueda, K.

AU - Shirahata, N.

AU - Isegawa, Kazuhisa

AU - Toyoshima, R.

AU - Masuda, S.

AU - Mase, K.

AU - Nito, T.

AU - Kondoh, H.

N1 - Funding Information: We thank the Photon Factory staffs for their technical supports. This study was supported partly by the Grants-in-Aid for scientific research (Nos. 20245004 and 26248008). The experiments were performed as the facility use at the Photon Factory (2015Y031). We thank Dr E. Mitsuda, Dr T. Baba, and Dr Y. Kawamura of Toyota Motor Corporation, for assistance with the computational modeling in this study. Funding Information: We thank the Photon Factory staffs for their technical supports. This study was supported partly by the Grants-in-Aid for scientific research (Nos. 20245004 and 26248008). The experiments were performed as the facility use at the Photon Factory (2015Y031). We thank Dr E. Mitsuda, Dr T. Baba, and Dr Y. Kawamura of Toyota Motor Corporation , for assistance with the computational modeling in this study.

PY - 2019/7

Y1 - 2019/7

N2 - 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.

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.

KW - In-situ observation

KW - Ir(111)

KW - NAP-XPS

KW - NO adsorption

KW - Oxygen effects

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