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 journalArticlepeer-review

36 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalSurface Science
Volume355
Issue number1-3
DOIs
Publication statusPublished - 1996 Jun 1
Externally publishedYes

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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