Influence of oxygen atmosphere on dissolution of platinum under potential cycling

Akihiko Kawano, Shin Ichiro Imabayashi

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12 Citations (Scopus)


The influence of oxygen atmosphere on platinum (Pt) dissolution under potentiodynamic conditions was investigated in 1.0 mol dm-3 HClO 4 at 80 °C over the range 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.

Original languageEnglish
Pages (from-to)F67-F71
JournalJournal of the Electrochemical Society
Issue number1
Publication statusPublished - 2014

ASJC Scopus subject areas

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


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