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

doi:10.30919/esmm5f176

Possible Evidence of a Point of Discontinuity (T*) on the Arrhenius Relationship for the Ba_0.5Sr_0.5Co_1-xFe_xO_3-δ Solid Solutions: A Non-Conventional Analysis

Edoardo Magnone, Grazia Accardo, Paolo Mele

Department of Chemical and Biochemical Engineering

Research output: Contribution to journal › Review article › peer-review

2 Scopus citations

Abstract

Ba_0.5Sr_0.5Co_1-xFe_xO_3-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 Ba_0.5Sr_0.5Co_1-xFe_xO_3-δ at T*=680 ^oC.

Original language	English
Pages (from-to)	60-66
Number of pages	7
Journal	ES Materials and Manufacturing
Volume	2
DOIs	https://doi.org/10.30919/esmm5f176
State	Published - Dec 2018

Keywords

BaSrCoFeO
Electrochemical Impedance Spectroscopy
Non-Arrhenius Behavior

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title = "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",

abstract = "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.",

keywords = "BaSrCoFeO, Electrochemical Impedance Spectroscopy, Non-Arrhenius Behavior",

author = "Edoardo Magnone and Grazia Accardo and Paolo Mele",

note = "Publisher Copyright: {\textcopyright} Engineered Science Publisher LLC 2018.",

year = "2018",

month = dec,

doi = "10.30919/esmm5f176",

language = "English",

volume = "2",

pages = "60--66",

journal = "ES Materials and Manufacturing",

issn = "2578-0611",

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TY - JOUR

T1 - Possible Evidence of a Point of Discontinuity (T*) on the Arrhenius Relationship for the Ba0.5Sr0.5Co1-xFexO3-δ Solid Solutions

T2 - A Non-Conventional Analysis

AU - Magnone, Edoardo

AU - Accardo, Grazia

AU - Mele, Paolo

N1 - Publisher Copyright: © Engineered Science Publisher LLC 2018.

PY - 2018/12

Y1 - 2018/12

N2 - 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.

AB - 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.

KW - BaSrCoFeO

KW - Electrochemical Impedance Spectroscopy

KW - Non-Arrhenius Behavior

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U2 - 10.30919/esmm5f176

DO - 10.30919/esmm5f176

M3 - Review article

AN - SCOPUS:85064438874

SN - 2578-0611

VL - 2

SP - 60

EP - 66

JO - ES Materials and Manufacturing

JF - ES Materials and Manufacturing

ER -

Possible Evidence of a Point of Discontinuity (T*) on the Arrhenius Relationship for the Ba_0.5Sr_0.5Co_1-xFe_xO_3-δ Solid Solutions: A Non-Conventional Analysis

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