Possible Evidence of a Point of Discontinuity (T*) on the Arrhenius Relationship for the Ba0.5Sr0.5Co1-xFexO3-δ Solid Solutions: A Non-Conventional Analysis

Edoardo Magnone, Grazia Accardo, Paolo Mele

研究成果: Review article査読

2 被引用数 (Scopus)

抄録

Ba0.5Sr0.5Co1-xFexO3-δ solid solutions (x = 0.2, 0.5 and 0.8) have been studied by means of electrochemical impedance spectroscopy (EIS) in the temperature range of 500-800 °C under different atmospheres (oxygen and air). EIS measurements of oxygen reduction reaction (ORR) show a possible non-Arrhenius behavior at T*=680 oC. Moreover, this paper reviews the experimental evidence of a non-Arrhenius behavior (curvature) instead of a linear extrapolation commonly used in literature. Non-Arrhenius behavior is ascribed to a chemical step (Warburg-type impedance element) at a low-frequency range when the temperature is below T*. An electrochemical model is also tentatively proposed to explain the non-Arrhenius behavior of Ba0.5Sr0.5Co1-xFexO3-δ at T*=680 oC.

本文言語English
ページ(範囲)60-66
ページ数7
ジャーナルES Materials and Manufacturing
2
DOI
出版ステータスPublished - 2018 12月
外部発表はい

ASJC Scopus subject areas

  • 建築および建設
  • セラミックおよび複合材料
  • 金属および合金
  • ポリマーおよびプラスチック
  • 応用数学
  • モデリングとシミュレーション
  • 数値解析

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