The Brønsted-Evans-Polanyi relationship in oxygen exchange of fuel cell cathode material SrCo0.9Ta0.1O3-: δ with the gas phase

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The Brønsted-Evans-Polanyi relationship in oxygen exchange of fuel cell cathode material SrCo_0.9Ta_0.1O_{3-: δ}with the gas phase. / Chizhik, Stanislav A.; Bychkov, Sergey F.; Voloshin, Bogdan V. et al.

In: Physical Chemistry Chemical Physics, Vol. 23, No. 2, 14.01.2021, p. 1072-1081.

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

BibTeX

@article{6ba39435529a4c958a83c7d933a95c54,

title = "The Br{\o}nsted-Evans-Polanyi relationship in oxygen exchange of fuel cell cathode material SrCo0.9Ta0.1O3-: δ with the gas phase",

abstract = "Perovskite related oxides ABO3-δ exhibiting mixed ionic-electronic conductivity (MIEC) possess large deviations from the oxygen stoichiometry. When providing excellent application potential, this feature also makes it very difficult to study the reaction mechanism between such oxides and molecular oxygen, also known as the oxygen reduction reaction. The complexity of the theoretical interpretation of kinetic experiments originates from the significant dependence of the kinetic and equilibrium properties of MIEC oxides on δ. It is proposed to consider such grossly nonstoichiometric oxides having different oxygen nonstoichiometry as chemical homologues participating in the oxygen exchange reaction and forming a series continuous in δ. The continuous homologous series approach is considered using the example of SrCo0.9Ta0.1O3-δ, an SOFC cathode material. The equilibrium and kinetic properties of the oxide were studied by new methods of oxygen partial pressure relaxation and oxygen release. Linear free-energy relationships have been discovered in the homologous series: thermodynamic and kinetic enthalpy-entropy compensations, as well as the Br{\o}nsted-Evans-Polanyi relation. A relationship has been established between the change in the observed LFERs and the morphotropic phase transition in the oxide. This journal is ",

author = "Chizhik, {Stanislav A.} and Bychkov, {Sergey F.} and Voloshin, {Bogdan V.} and Popov, {Mikhail P.} and Nemudry, {Alexander P.}",

year = "2021",

month = jan,

day = "14",

doi = "10.1039/d0cp04856a",

language = "English",

volume = "23",

pages = "1072--1081",

journal = "Physical Chemistry Chemical Physics",

issn = "1463-9076",

publisher = "Royal Society of Chemistry",

number = "2",

}

RIS

TY - JOUR

T1 - The Brønsted-Evans-Polanyi relationship in oxygen exchange of fuel cell cathode material SrCo0.9Ta0.1O3-: δ with the gas phase

AU - Chizhik, Stanislav A.

AU - Bychkov, Sergey F.

AU - Voloshin, Bogdan V.

AU - Popov, Mikhail P.

AU - Nemudry, Alexander P.

PY - 2021/1/14

Y1 - 2021/1/14

N2 - Perovskite related oxides ABO3-δ exhibiting mixed ionic-electronic conductivity (MIEC) possess large deviations from the oxygen stoichiometry. When providing excellent application potential, this feature also makes it very difficult to study the reaction mechanism between such oxides and molecular oxygen, also known as the oxygen reduction reaction. The complexity of the theoretical interpretation of kinetic experiments originates from the significant dependence of the kinetic and equilibrium properties of MIEC oxides on δ. It is proposed to consider such grossly nonstoichiometric oxides having different oxygen nonstoichiometry as chemical homologues participating in the oxygen exchange reaction and forming a series continuous in δ. The continuous homologous series approach is considered using the example of SrCo0.9Ta0.1O3-δ, an SOFC cathode material. The equilibrium and kinetic properties of the oxide were studied by new methods of oxygen partial pressure relaxation and oxygen release. Linear free-energy relationships have been discovered in the homologous series: thermodynamic and kinetic enthalpy-entropy compensations, as well as the Brønsted-Evans-Polanyi relation. A relationship has been established between the change in the observed LFERs and the morphotropic phase transition in the oxide. This journal is

AB - Perovskite related oxides ABO3-δ exhibiting mixed ionic-electronic conductivity (MIEC) possess large deviations from the oxygen stoichiometry. When providing excellent application potential, this feature also makes it very difficult to study the reaction mechanism between such oxides and molecular oxygen, also known as the oxygen reduction reaction. The complexity of the theoretical interpretation of kinetic experiments originates from the significant dependence of the kinetic and equilibrium properties of MIEC oxides on δ. It is proposed to consider such grossly nonstoichiometric oxides having different oxygen nonstoichiometry as chemical homologues participating in the oxygen exchange reaction and forming a series continuous in δ. The continuous homologous series approach is considered using the example of SrCo0.9Ta0.1O3-δ, an SOFC cathode material. The equilibrium and kinetic properties of the oxide were studied by new methods of oxygen partial pressure relaxation and oxygen release. Linear free-energy relationships have been discovered in the homologous series: thermodynamic and kinetic enthalpy-entropy compensations, as well as the Brønsted-Evans-Polanyi relation. A relationship has been established between the change in the observed LFERs and the morphotropic phase transition in the oxide. This journal is

UR - http://www.scopus.com/inward/record.url?scp=85100085861&partnerID=8YFLogxK

U2 - 10.1039/d0cp04856a

DO - 10.1039/d0cp04856a

M3 - Article

C2 - 33346263

AN - SCOPUS:85100085861

VL - 23

SP - 1072

EP - 1081

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 2

ER -

ID: 27692509