Research output: Contribution to journal › Article › peer-review
Kinetics and thermodynamics of oxygen exchange in strontium cobalt tungsten perovskite-like oxides. / Fouad, Mario; Guskov, Rostislav; Gongola, Marko et al.
In: Ceramics International, Vol. 52, No. 3, 2026, p. 3671-3680.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Kinetics and thermodynamics of oxygen exchange in strontium cobalt tungsten perovskite-like oxides
AU - Fouad, Mario
AU - Guskov, Rostislav
AU - Gongola, Marko
AU - Kovalev, Ivan
AU - Popov, Mikhail
AU - Nemudry, Alexander
N1 - Mario Fouad, Rostislav Guskov, Marko Gongola, Ivan Kovalev, Mikhail Popov, Alexander Nemudry, Kinetics and thermodynamics of oxygen exchange in strontium cobalt tungsten perovskite-like oxides, Ceramics International, Volume 52, Issue 3, 2026, Pages 3671-3680, ISSN 0272-8842, https://doi.org/10.1016/j.ceramint.2025.12.159. - EDN: GZCAWJ. The reported study was funded by Russian Science Foundation (Project N◦ 22-73-10200).
PY - 2026
Y1 - 2026
N2 - Strontium cobalt tungsten oxide (SrCo0.98W0.02O3-δ, SCW2) is a promising candidate for solid oxide fuel cell (SOFC) cathodes because of its enhanced redox stability and mixed ionic-electronic conductivity (MIEC). In this work, the oxygen exchange kinetics and the equilibrium SrCo0.98W0.02O3-δ thermodynamics of the quasi-equilibrium oxygen release (QEOR) and oxygen partial pressure relaxation (OPPR) methods have been systematically investigated in the range of 600–850 °C. X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) confirm high phase purity, dense microstructure and structural integrity. QEOR measurements allowed the construction of temperature-dependent oxygen non-stoichiometry (δ) and chemical potential profiles, while OPPR allowed determination of kinetic parameters such as the surface exchange coefficient (kchem), bulk diffusion coefficient (Dchem), and equilibrium exchange rate constant (R0). These parameters are related to the oxygen partial pressure by the power-law dependence and show temperature-activated behavior in accordance with the linear free energy relationship (LFER) as governed by the Brønsted-Evans-Polanyi principle. Notably, the combination of the Δ (Formula presented) and activation enthalpy and entropy reveal compensatory effects affected by the value of the delta, indicating a configuration contribution from oxygen vacancies at higher temperatures. These findings provide a key insight into the oxygen transport mechanisms of SCW2, and highlight its potential as a durable and high performance SOFC cathode material.
AB - Strontium cobalt tungsten oxide (SrCo0.98W0.02O3-δ, SCW2) is a promising candidate for solid oxide fuel cell (SOFC) cathodes because of its enhanced redox stability and mixed ionic-electronic conductivity (MIEC). In this work, the oxygen exchange kinetics and the equilibrium SrCo0.98W0.02O3-δ thermodynamics of the quasi-equilibrium oxygen release (QEOR) and oxygen partial pressure relaxation (OPPR) methods have been systematically investigated in the range of 600–850 °C. X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) confirm high phase purity, dense microstructure and structural integrity. QEOR measurements allowed the construction of temperature-dependent oxygen non-stoichiometry (δ) and chemical potential profiles, while OPPR allowed determination of kinetic parameters such as the surface exchange coefficient (kchem), bulk diffusion coefficient (Dchem), and equilibrium exchange rate constant (R0). These parameters are related to the oxygen partial pressure by the power-law dependence and show temperature-activated behavior in accordance with the linear free energy relationship (LFER) as governed by the Brønsted-Evans-Polanyi principle. Notably, the combination of the Δ (Formula presented) and activation enthalpy and entropy reveal compensatory effects affected by the value of the delta, indicating a configuration contribution from oxygen vacancies at higher temperatures. These findings provide a key insight into the oxygen transport mechanisms of SCW2, and highlight its potential as a durable and high performance SOFC cathode material.
KW - Equilibrium oxygen release
KW - Perovskite
KW - QEOR & OPPR
KW - Relaxation kinetics
KW - SCW
KW - Perovskite
KW - SCW
KW - QEOR & OPPR
KW - Equilibrium oxygen release
KW - Relaxation kinetics
UR - https://www.mendeley.com/catalogue/da04a33b-b428-3576-a254-17c325d3e799/
UR - https://www.scopus.com/pages/publications/105029686005
UR - https://www.elibrary.ru/item.asp?id=88164371
U2 - 10.1016/j.ceramint.2025.12.159
DO - 10.1016/j.ceramint.2025.12.159
M3 - Article
VL - 52
SP - 3671
EP - 3680
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 3
ER -
ID: 83257078