ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

электродные материалы

In situ high-temperature X-ray diffraction of La0.6Sr0.4Co1 – xMoxO3 – δ (x = 0.0–0.10) oxides used as cathodes for solid oxide fuel cells

The dependence of thermal expansion on the composition and atmosphere for molybdenumdoped lanthanum-strontium cobaltite La0.6Sr0.4Co1−xMoxO3−δ (х = 0–0.10) was studied by in situ hightemperature X-ray diffraction method (HTXRD). The linear coefficients of thermal expansion (CTE) were determined in air in the temperature range of 30–750°C. The linear dependence of the unit cell parameters on the molybdenum content was observed for the entire range of compositions, which obeys Vegard’s law and indicates the formation of solid solutions.

Synthesis and thermodynamic properties of new cathode materials for solid oxide fuel cells based on lanthanum strontium cobaltite

Doped with tantalum cations a new prospective cathode material for solid oxide fuel cells of lanthanum strontium cobaltite was synthesized. High-temperature oxygen desorption was studied using the quasi-equilibrium oxygen release method, the ranges of oxygen nonstoichiometry were determined, and the values of thermodynamic functions of the system were obtained in the temperature ranges (600–850°C) and oxygen partial pressures (∼10−5– 0.2 atm).

Study of electrode materials based on La0.65Ca0.35Co0.2Fe0.8 – xNixO1 – δ oxides used in solid oxide fuel cells and electrolyzers

The effect of iron substitution with nickel cations in La0.65Ca0.35Co0.2Fe0.8−xNixO1−δ oxide on the structural and transport properties of electrode materials for solid oxide fuel cells and electrolyzers was studied in this work. It was shown that Ni3+ cations isomorphically replace Fe3+ /Fe4+ cations in the structure of perovskite. The total conductivity of La0.65Ca0.35Co0.2Fe0.8−xNixO1−δ (x = 0, 0.05) materials was measured in air in the temperature range from 100 to 850°C using the Van der Pauw method.

Quasi-equilibrium oxygen release from oxides used as electrodes in solid oxide fuel cells and electrolyzers

The dependence of oxygen stoichiometry on the oxygen partial pressure and the temperature for La- and Nb-doped strontium ferrite La0.4Sr0.6Fe0.95Nb0.05O3 – δ (LSFNb5) was studied by quasi-equilibrium oxygen release (QEOR) method. The equilibrium diagram in the coordinates “T – lg(pO2 ) – 3 – δ” in the temperature range of 700–900°C and oxygen partial pressures pO2 = 10–4 – 0.2 atm was obtained. The range of stoichiometry deviation was determined, and the thermodynamic parameters of the oxygen release process were analyzed.

Квазиравновесное выделение кислорода из оксидов, применяемых в качестве электродов твердооксидных топливных элементов и электролизеров

Зависимость кислородной стехиометрии от парциального давления кислорода и температуры для допированного лантаном и ниобием феррита стронция La0.4Sr0.6Fe0.95Nb0.05O3-δ (LSFNb5) была изучена в динамических экспериментах по квазиравновесному выделению кислорода (КРВК). Равновесная диаграмма в координатах «Т – lg(pO2) – 3-δ» получена в температурном диапазоне 700-900 °С и парциальных давлениях кислорода pO2 = 10-4 – 0.2 атм. Определен диапазон изменения стехиометрии, проанализированы термодинамические параметры процесса выделения кислорода из оксида.