Influence of oxygen atmosphere on dissolution of platinum under potential cycling

Akihiko Kawano, Shinichiro Imabayashi

研究成果: Article

6 引用 (Scopus)

抄録

The influence of oxygen atmosphere on platinum (Pt) dissolution under potentiodynamic conditions was investigated in 1.0 mol dm<sup>-3</sup> HClO <inf>4</inf> at 80 °C over the range 0.0.0.7MPa of oxygen partial pressure (pO2). The rate of Pt dissolution depended concavely on pO2 with the minimum at 0.091 MPa. When pO2 was below 0.091 MPa, the oxygen atmosphere suppressed the platinum dissolution from an oxide-deprived Pt surface owing to an increase in the coverage of passive oxides, resulting in a decrease in the rate of Pt dissolution with increasing values of pO2. For pO2 ≥ 0.091 MPa, the current of oxygen reduction reaction (ORR) increases with pO2. This further participated in an increase in the rate of Pt dissolution, probably through the cathodic dissolution of higher-order oxides formed as intermediates in ORR.

元の言語English
ジャーナルJournal of the Electrochemical Society
161
発行部数1
DOI
出版物ステータスPublished - 2014

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Platinum
dissolving
Dissolution
platinum
Oxygen
atmospheres
cycles
oxygen
Oxides
platinum oxides
oxides
Partial pressure
partial pressure

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

これを引用

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