## 抄録

Certain aspects of the interpretation of rotating ring-disk electrode, RRDE, data for the oxygen reduction reaction, ORR, in aqueous electrolytes have been examined. In particular, the classical mechanism proposed by Damjanovic et al. [ J. Chem. Phys. 45, 4057 (1966)] predicts that at a fixed potential, a plot of the ratio of the disk to the ring currents for the ORR vs -Ω^{-1/2} , where is Ω the rotation rate of the disk, should be linear. According to this analysis, the slope of this line is proportional to k _{3} / X H_{2} O_{2} , where k3 is the rate constant for the reduction of solution phase hydrogen peroxide, H_{2} O_{2} (aq), and X H_{2} O_{2} is the fraction of the disk current that generates H_{2} O_{2} (aq), the magnitude of which can be determined from the line intercept. Illustrations of this theoretical framework are provided for ORR data reported in the literature for experiments involving Pt-based electrodes and collected in our laboratories for Pt in aqueous acidic solutions. Critically emphasized is the need to perform ring-disk measurements at multiple rotations rates in order to determine reliable values of X H_{2} O_{2}, which can be used as figures of merit for ranking the efficacy of ORR electrocatalysts.

本文言語 | English |
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ページ（範囲） | F39-F42 |

ジャーナル | ECS Electrochemistry Letters |

巻 | 4 |

号 | 6 |

DOI | |

出版ステータス | Published - 2015 1月 1 |

外部発表 | はい |

## ASJC Scopus subject areas

- 電気化学
- 材料化学
- 燃料技術

## フィンガープリント

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