Influence of oxygen atmosphere on dissolution of platinum under potential cycling

Akihiko Kawano; Shinichiro Imabayashi

doi:10.1149/2.051401jes

Influence of oxygen atmosphere on dissolution of platinum under potential cycling

Akihiko Kawano, Shinichiro Imabayashi

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

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.

Original language	English
Journal	Journal of the Electrochemical Society
Volume	161
Issue number	1
DOIs	https://doi.org/10.1149/2.051401jes
Publication status	Published - 2014

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

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abstract = "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 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.",

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AU - Kawano, Akihiko

AU - Imabayashi, Shinichiro

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AB - 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 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.

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Influence of oxygen atmosphere on dissolution of platinum under potential cycling

Abstract

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