твёрдооксидные топливные элементы

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.

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).

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.

In this work, the supporting electrolytes for solid oxide fuel cells based on samarium doped cerium oxide Ce0.8Sm0.2O1.95 were fabricated using 3D inkjet printing and layer-by-layer laser treatment followed by thermal sintering. The samples were characterized by scanning electron microscopy, X-ray diffraction analysis and impedance spectroscopy. The Vickers hardness test and three-point bending flexural test were carried out.

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.

Computer modelling of the mechanical stress state originating at manufacturing and heating to a working temperature of cells of the SOFC of a tubular design with classical functional materials (Ni-YSZ)/YSZ/LSM is developed. Electrolyte-supported and anode-supported cells are observed, and also the residual stresses originating by manufacture of the module a cone-cone with direct anode-cathode contact are simulated. Simulation of process of manufacturing anode-supported cells display that there is no the stress, able to lead to cell rupture.