Photoelectron spectroscopic study of CO and NO adsorption on Pd(100) surface under ambient pressure conditions

Ryo Toyoshima; Masaaki Yoshida; Yuji Monya; Kazuma Suzuki; Kenta Amemiya; Kazuhiko Mase; Bongjin Simon Mun; Hiroshi Kondoh

doi:10.1016/j.susc.2013.04.009

Photoelectron spectroscopic study of CO and NO adsorption on Pd(100) surface under ambient pressure conditions

Ryo Toyoshima, Masaaki Yoshida, Yuji Monya, Kazuma Suzuki, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun, Hiroshi Kondoh

Department of Chemistry

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

14 Citations (Scopus)

Abstract

We report molecular CO and NO adsorption structures on Pd(100) single crystal surfaces under sub-Torr pressure conditions at room temperature. A combination of ambient pressure X-ray photoelectron spectroscopy and density functional theory based calculations indicates that CO molecules adsorb at 2-fold bridge sites with (2√2 × √2)R45, (3√2 × √2)R45 and (4√2 × √2)R45 structures under the CO gas pressures at room temperature. Furthermore a higher-density adsorption structure is reversibly formed at 0.5 Torr CO, where all the CO molecules keep sitting on the bridge sites. In case of NO adsorption, at 10^{- 7} Torr, a (2√2 × √2)R45 structure with occupying bridge sites is formed, which is the same as the case of CO. However, subsequent gas introduction up to 0.5 Torr causes additional site occupation of on-top sites. Furthermore NO molecules partially dissociate into atomic N and O species but they disappear from the surface due to further reaction with NO under ambient conditions.

Original language	English
Pages (from-to)	33-40
Number of pages	8
Journal	Surface Science
Volume	615
DOIs	https://doi.org/10.1016/j.susc.2013.04.009
Publication status	Published - 2013 Sept

Keywords

Ambient-pressure
Carbon monoxide
DFT based calculations
Nitric oxide
Pd(100)
XPS

ASJC Scopus subject areas

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

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10.1016/j.susc.2013.04.009

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@article{047265b54a2b461bbfb039370402202c,

title = "Photoelectron spectroscopic study of CO and NO adsorption on Pd(100) surface under ambient pressure conditions",

abstract = "We report molecular CO and NO adsorption structures on Pd(100) single crystal surfaces under sub-Torr pressure conditions at room temperature. A combination of ambient pressure X-ray photoelectron spectroscopy and density functional theory based calculations indicates that CO molecules adsorb at 2-fold bridge sites with (2√2 × √2)R45, (3√2 × √2)R45 and (4√2 × √2)R45 structures under the CO gas pressures at room temperature. Furthermore a higher-density adsorption structure is reversibly formed at 0.5 Torr CO, where all the CO molecules keep sitting on the bridge sites. In case of NO adsorption, at 10- 7 Torr, a (2√2 × √2)R45 structure with occupying bridge sites is formed, which is the same as the case of CO. However, subsequent gas introduction up to 0.5 Torr causes additional site occupation of on-top sites. Furthermore NO molecules partially dissociate into atomic N and O species but they disappear from the surface due to further reaction with NO under ambient conditions.",

keywords = "Ambient-pressure, Carbon monoxide, DFT based calculations, Nitric oxide, Pd(100), XPS",

author = "Ryo Toyoshima and Masaaki Yoshida and Yuji Monya and Kazuma Suzuki and Kenta Amemiya and Kazuhiko Mase and Mun, {Bongjin Simon} and Hiroshi Kondoh",

note = "Funding Information: This study was supported by the Grants-in-Aid for Scientific Research (No. 20245004 ) and the MEXT-Supported Program for the Strategic Research Foundation at Private Universities , 2009–2013. The experiments have been performed under the approval of the Photon Factory Program Advisory Committee (PF PAC Nos. 2010G151 and 2012G093). ",

year = "2013",

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doi = "10.1016/j.susc.2013.04.009",

language = "English",

volume = "615",

pages = "33--40",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier",

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TY - JOUR

T1 - Photoelectron spectroscopic study of CO and NO adsorption on Pd(100) surface under ambient pressure conditions

AU - Toyoshima, Ryo

AU - Yoshida, Masaaki

AU - Monya, Yuji

AU - Suzuki, Kazuma

AU - Amemiya, Kenta

AU - Mase, Kazuhiko

AU - Mun, Bongjin Simon

AU - Kondoh, Hiroshi

N1 - Funding Information: This study was supported by the Grants-in-Aid for Scientific Research (No. 20245004 ) and the MEXT-Supported Program for the Strategic Research Foundation at Private Universities , 2009–2013. The experiments have been performed under the approval of the Photon Factory Program Advisory Committee (PF PAC Nos. 2010G151 and 2012G093).

PY - 2013/9

Y1 - 2013/9

N2 - We report molecular CO and NO adsorption structures on Pd(100) single crystal surfaces under sub-Torr pressure conditions at room temperature. A combination of ambient pressure X-ray photoelectron spectroscopy and density functional theory based calculations indicates that CO molecules adsorb at 2-fold bridge sites with (2√2 × √2)R45, (3√2 × √2)R45 and (4√2 × √2)R45 structures under the CO gas pressures at room temperature. Furthermore a higher-density adsorption structure is reversibly formed at 0.5 Torr CO, where all the CO molecules keep sitting on the bridge sites. In case of NO adsorption, at 10- 7 Torr, a (2√2 × √2)R45 structure with occupying bridge sites is formed, which is the same as the case of CO. However, subsequent gas introduction up to 0.5 Torr causes additional site occupation of on-top sites. Furthermore NO molecules partially dissociate into atomic N and O species but they disappear from the surface due to further reaction with NO under ambient conditions.

AB - We report molecular CO and NO adsorption structures on Pd(100) single crystal surfaces under sub-Torr pressure conditions at room temperature. A combination of ambient pressure X-ray photoelectron spectroscopy and density functional theory based calculations indicates that CO molecules adsorb at 2-fold bridge sites with (2√2 × √2)R45, (3√2 × √2)R45 and (4√2 × √2)R45 structures under the CO gas pressures at room temperature. Furthermore a higher-density adsorption structure is reversibly formed at 0.5 Torr CO, where all the CO molecules keep sitting on the bridge sites. In case of NO adsorption, at 10- 7 Torr, a (2√2 × √2)R45 structure with occupying bridge sites is formed, which is the same as the case of CO. However, subsequent gas introduction up to 0.5 Torr causes additional site occupation of on-top sites. Furthermore NO molecules partially dissociate into atomic N and O species but they disappear from the surface due to further reaction with NO under ambient conditions.

KW - Ambient-pressure

KW - Carbon monoxide

KW - DFT based calculations

KW - Nitric oxide

KW - Pd(100)

KW - XPS

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SN - 0039-6028

VL - 615

SP - 33

EP - 40

JO - Surface Science

JF - Surface Science

ER -

Photoelectron spectroscopic study of CO and NO adsorption on Pd(100) surface under ambient pressure conditions

Abstract

Keywords

ASJC Scopus subject areas

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