Microelectrochemical study on the surface oxidation of pt: The effects of crystal orientation and grain boundary

Mayu Sasaki, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Microelectrochemical polarization measurements of polycrystalline Pt were performed to clarify the effect of the crystal orientation and grain boundary on the surface oxidation of Pt. Cyclic voltammograms (CV) for Pt(100)-like and Pt(110)-like grains on polycrystalline Pt after mechanical polishing showed no anodic peak below 1.35V, which is similar to that for well-annealed Pt(111) single crystal. The anodic current of Pt(110)-like grain was significantly larger than Pt(100)-like. A small but concrete current increase appeared around 1.05-1.3Vin the CVof the surface including grain boundaries. This suggests the grain boundary may be the preferential site for the dissolution.

Original languageEnglish
Pages (from-to)735-738
Number of pages4
JournalMaterials Transactions
Volume55
Issue number4
DOIs
Publication statusPublished - 2014

Keywords

  • Crystal orientation
  • Grain boundary
  • Microelectrochemical cell
  • Platinum dissolution
  • Platinum oxidation
  • Surface orientation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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