Oxygen Exchange in MIEC Perovskite Oxide La0.6Sr0.4Co0.2Fe0.8O3-δ: Kinetic and Equilibrium Parameters and Their Interrelation

被引：5

作者：

Guskov, Rostislav. D. ^{[1
]}

Popov, Mikhail. P. ^{[1
]}

Gongola, Marko. I. ^{[1
,2
]}

Kovalev, Ivan. V. ^{[1
]}

Chizhik, Stanislav. A. ^{[1
]}

Nemudry, Alexander. P. ^{[1
]}

机构：

[1] Inst Solid State Chem & Mechanochem SB RAS, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, Novosibirsk 630090, Russia

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2024年 / 128卷 / 12期

基金：

俄罗斯科学基金会;

关键词：

EVANS-POLANYI RELATIONSHIP; ELECTRICAL-CONDUCTIVITY; COULOMETRIC TITRATION; STRUCTURAL FEATURES; TRANSPORT; NONSTOICHIOMETRY; PERMEABILITY; COEFFICIENTS; STABILITY; ELECTRODE;

D O I：

10.1021/acs.jpcc.3c07696

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper is devoted to a detailed study of the kinetic and thermodynamic characteristics of one of the most well-known solid oxide fuel cells cathode materials, La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) oxide, using the original oxygen partial pressure relaxation (OPPR) with macrokinetic model Tanks-in-Series (TIS) and quasi-equilibrium oxygen release (QEOR) techniques. Power-law dependences of kinetic characteristics on the partial pressure of oxygen and their Arrhenius dependences are shown. The equilibrium properties of the oxide are represented as continuous diagrams << T - pO(2) - delta >> and << T - mu O-2(oxide) - delta >>. It is shown that the Br & oslash;nsted-Evans-Polanyi homological approach is valid for LSCF and allows us to consider it as a series of delta-homologues involved in the same reaction with gaseous oxygen. The contribution of the entropy factor to the Gibbs activation energy is shown to be superior, which is typical for ferrites of ABO(3-delta) composition.

引用

页码：4997 / 5010

页数：14

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