Influence of oxygen atmosphere on dissolution of platinum under potential cycling

Akihiko Kawano, Shinichiro Imabayashi

研究成果: Article査読

8 被引用数 (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.

本文言語English
ジャーナルJournal of the Electrochemical Society
161
1
DOI
出版ステータスPublished - 2014

ASJC Scopus subject areas

  • 電気化学
  • 電子材料、光学材料、および磁性材料
  • 材料化学
  • 表面、皮膜および薄膜
  • 再生可能エネルギー、持続可能性、環境
  • 凝縮系物理学

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