Irreversible change in the NO adsorption state on Pt(111) under high pressure studied by AP-XPS, NEXAFS, and STM

Toru Shimada; Bongjin Simon Mun; Ikuyo F. Nakai; Atsushi Banno; Hitoshi Abe; Yasuhiro Iwasawa; Toshiaki Ohta; Hiroshi Kondoh

doi:10.1021/jp102777j

Irreversible change in the NO adsorption state on Pt(111) under high pressure studied by AP-XPS, NEXAFS, and STM

Toru Shimada
, Bongjin Simon Mun
, Ikuyo F. Nakai
, Atsushi Banno
, Hitoshi Abe
, Yasuhiro Iwasawa
, Toshiaki Ohta
, Hiroshi Kondoh

Department of Chemistry

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

29 Citations (Scopus)

Abstract

Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) has been applied to the investigation of NO adsorption on Pt(111) under various pressures of NO (up to 1 Torr) at room temperature. Under 10^-7 Torr, molecular NO occupies the most stable fcc-hollow sites and partially occupies the energetically unfavorable atop sites. NO reversibly desorbs from the atop sites after evacuation. At NO pressures higher than 10^-6 Torr, however, irreversible adsorption of atomic oxygen takes place via NO dissociation, leading to the formation of NO+O domains. This result is consistent with near-edge X-ray absorption fine structure (NEXAFS) and scanning tunneling microscopy (STM) results.

Original language	English
Pages (from-to)	17030-17035
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	114
Issue number	40
DOIs	https://doi.org/10.1021/jp102777j
Publication status	Published - 2010 Oct 14

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp102777j

Cite this

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title = "Irreversible change in the NO adsorption state on Pt(111) under high pressure studied by AP-XPS, NEXAFS, and STM",

abstract = "Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) has been applied to the investigation of NO adsorption on Pt(111) under various pressures of NO (up to 1 Torr) at room temperature. Under 10-7 Torr, molecular NO occupies the most stable fcc-hollow sites and partially occupies the energetically unfavorable atop sites. NO reversibly desorbs from the atop sites after evacuation. At NO pressures higher than 10-6 Torr, however, irreversible adsorption of atomic oxygen takes place via NO dissociation, leading to the formation of NO+O domains. This result is consistent with near-edge X-ray absorption fine structure (NEXAFS) and scanning tunneling microscopy (STM) results.",

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AU - Shimada, Toru

AU - Mun, Bongjin Simon

AU - Nakai, Ikuyo F.

AU - Banno, Atsushi

AU - Abe, Hitoshi

AU - Iwasawa, Yasuhiro

AU - Ohta, Toshiaki

AU - Kondoh, Hiroshi

PY - 2010/10/14

Y1 - 2010/10/14

N2 - Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) has been applied to the investigation of NO adsorption on Pt(111) under various pressures of NO (up to 1 Torr) at room temperature. Under 10-7 Torr, molecular NO occupies the most stable fcc-hollow sites and partially occupies the energetically unfavorable atop sites. NO reversibly desorbs from the atop sites after evacuation. At NO pressures higher than 10-6 Torr, however, irreversible adsorption of atomic oxygen takes place via NO dissociation, leading to the formation of NO+O domains. This result is consistent with near-edge X-ray absorption fine structure (NEXAFS) and scanning tunneling microscopy (STM) results.

AB - Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) has been applied to the investigation of NO adsorption on Pt(111) under various pressures of NO (up to 1 Torr) at room temperature. Under 10-7 Torr, molecular NO occupies the most stable fcc-hollow sites and partially occupies the energetically unfavorable atop sites. NO reversibly desorbs from the atop sites after evacuation. At NO pressures higher than 10-6 Torr, however, irreversible adsorption of atomic oxygen takes place via NO dissociation, leading to the formation of NO+O domains. This result is consistent with near-edge X-ray absorption fine structure (NEXAFS) and scanning tunneling microscopy (STM) results.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 40

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Irreversible change in the NO adsorption state on Pt(111) under high pressure studied by AP-XPS, NEXAFS, and STM

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