STM studies of a catalytically active p(3 × 1) Pt-Rh(100) alloy surface

Yuji Matsumoto; Yuji Okawa; Takaya Fujita; Ken Ichi Tanaka

doi:10.1016/0039-6028(96)01359-3

STM studies of a catalytically active p(3 × 1) Pt-Rh(100) alloy surface

Yuji Matsumoto, Yuji Okawa, Takaya Fujita, Ken Ichi Tanaka

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

36 Citations (Scopus)

Abstract

Oxygen-induced p(3 × 1) reconstruction of a Pt_0.25Rh_0.75(100) alloy surface was studied by scanning tunneling microscopy (STM). When a Pt-enriched (1 × 1) Pt-Rh(100) alloy surface was exposed to O₂, a clear p(3 × 1) LEED pattern appeared at temperatures higher than ca. 400 K, and segregation of Rh atoms was observed by STM. Once the p(3 × 1) Pt-Rh(100) surface is established at T≥400 K, a reversible interconversion, p(3 × l)→p(1 × 1) by H₂ and p(1 × 1)→p(3 × 1) by O₂, is brought about at room temperature. The p(3 × 1) surface showed three different STM images, depending on the tip condition, from which a model structure was deduced. The first formation of the p(3 × 1) structure requires the segregation of Rh atoms, but the interconversion between the p(3 × 1) and p(1 × 1) structures is responsible for the oxygen-induced array of Rh atoms along the 〈011〉directions.

Original language	English
Pages (from-to)	109-114
Number of pages	6
Journal	Surface Science
Volume	355
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(96)01359-3
Publication status	Published - 1996 Jun 1
Externally published	Yes

Keywords

Alloys
Hydrogen
Low index single crystal surfaces
Oxygen
Platinum
Rhodium
Scanning tunneling microscopy
Surface structure, morphology, roughness, and topography

ASJC Scopus subject areas

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

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10.1016/0039-6028(96)01359-3

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title = "STM studies of a catalytically active p(3 × 1) Pt-Rh(100) alloy surface",

abstract = "Oxygen-induced p(3 × 1) reconstruction of a Pt0.25Rh0.75(100) alloy surface was studied by scanning tunneling microscopy (STM). When a Pt-enriched (1 × 1) Pt-Rh(100) alloy surface was exposed to O2, a clear p(3 × 1) LEED pattern appeared at temperatures higher than ca. 400 K, and segregation of Rh atoms was observed by STM. Once the p(3 × 1) Pt-Rh(100) surface is established at T≥400 K, a reversible interconversion, p(3 × l)→p(1 × 1) by H2 and p(1 × 1)→p(3 × 1) by O2, is brought about at room temperature. The p(3 × 1) surface showed three different STM images, depending on the tip condition, from which a model structure was deduced. The first formation of the p(3 × 1) structure requires the segregation of Rh atoms, but the interconversion between the p(3 × 1) and p(1 × 1) structures is responsible for the oxygen-induced array of Rh atoms along the 〈011〉directions.",

keywords = "Alloys, Hydrogen, Low index single crystal surfaces, Oxygen, Platinum, Rhodium, Scanning tunneling microscopy, Surface structure, morphology, roughness, and topography",

author = "Yuji Matsumoto and Yuji Okawa and Takaya Fujita and Tanaka, {Ken Ichi}",

year = "1996",

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T1 - STM studies of a catalytically active p(3 × 1) Pt-Rh(100) alloy surface

AU - Matsumoto, Yuji

AU - Okawa, Yuji

AU - Fujita, Takaya

AU - Tanaka, Ken Ichi

PY - 1996/6/1

Y1 - 1996/6/1

N2 - Oxygen-induced p(3 × 1) reconstruction of a Pt0.25Rh0.75(100) alloy surface was studied by scanning tunneling microscopy (STM). When a Pt-enriched (1 × 1) Pt-Rh(100) alloy surface was exposed to O2, a clear p(3 × 1) LEED pattern appeared at temperatures higher than ca. 400 K, and segregation of Rh atoms was observed by STM. Once the p(3 × 1) Pt-Rh(100) surface is established at T≥400 K, a reversible interconversion, p(3 × l)→p(1 × 1) by H2 and p(1 × 1)→p(3 × 1) by O2, is brought about at room temperature. The p(3 × 1) surface showed three different STM images, depending on the tip condition, from which a model structure was deduced. The first formation of the p(3 × 1) structure requires the segregation of Rh atoms, but the interconversion between the p(3 × 1) and p(1 × 1) structures is responsible for the oxygen-induced array of Rh atoms along the 〈011〉directions.

AB - Oxygen-induced p(3 × 1) reconstruction of a Pt0.25Rh0.75(100) alloy surface was studied by scanning tunneling microscopy (STM). When a Pt-enriched (1 × 1) Pt-Rh(100) alloy surface was exposed to O2, a clear p(3 × 1) LEED pattern appeared at temperatures higher than ca. 400 K, and segregation of Rh atoms was observed by STM. Once the p(3 × 1) Pt-Rh(100) surface is established at T≥400 K, a reversible interconversion, p(3 × l)→p(1 × 1) by H2 and p(1 × 1)→p(3 × 1) by O2, is brought about at room temperature. The p(3 × 1) surface showed three different STM images, depending on the tip condition, from which a model structure was deduced. The first formation of the p(3 × 1) structure requires the segregation of Rh atoms, but the interconversion between the p(3 × 1) and p(1 × 1) structures is responsible for the oxygen-induced array of Rh atoms along the 〈011〉directions.

KW - Alloys

KW - Hydrogen

KW - Low index single crystal surfaces

KW - Oxygen

KW - Platinum

KW - Rhodium

KW - Scanning tunneling microscopy

KW - Surface structure, morphology, roughness, and topography

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STM studies of a catalytically active p(3 × 1) Pt-Rh(100) alloy surface

Abstract

Keywords

ASJC Scopus subject areas

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