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.

In this work, the effect of humidity on the microstructural degradation of nickel-based metal– ceramic composite materials containing 0, 10, 20, 40, and 60 wt.% of cobalt in the metallic phase was investigated. The increase in cobalt concentration was found to have a beneficial effect on the stability of the microstructure and the long-term electrical conductivity, indicating the perspective of cobalt alloying as an approach to improve the performance and durability of SOFC anodes.

Hot slip casting was applied to produce parts from magnesium-aluminate spinel for the ceramic gas flow distribution system for tubular solid oxide fuel cells. The developed system was sealed using glass sealants. The tubular oxide fuel cells was assembled using a gas unit made by hot slip casting.

Solid polymer electrolytes are one of the promising materials for solid-state supercapacitors. In this work, the solid polymer electrolytes PU-PFL100 were obtained based on polyurethane elastomer filled with LiBF4 solution in N-methyl-2-pyrrolidone.

A new design of the interconnect for tubular solid oxide fuel cells was presented. The functions of electrical connection and mechanical/gas distribution were separated in this interconnect. The electrical connection of the elements was provided by a separate metal wire laid around the frame. The paste composition and parameters for inkjet 3D printing, as well as the sintering regime, were optimized, enabling the production of dense samples with high microhardness.

A modification of the phase inversion method that enables high-precision control of the geometric parameters (diameter, wall thickness, and degree of alignment) of anode microtubular substrates of solid oxide fuel cells was proposed. Due to unique properties of the phase inversion process, which occurs simultaneously with solvent melting, anode microtubes with increased porosity and gas permeability were obtained compared to the microtubes obtained by traditional phase inversion extrusion method.

Microtubular membranes with the composition of La0.6Sr0.2Ba0.2Fe0.7Ni0.1Co0.2O3−δ were fabricated using phase inversion and dip- coating methods, followed by sintering in air. The obtained microtubular membranes were characterized by X-ray diffraction analysis and scanning electron microscopy. The optimal sintering temperature was selected taking into account the target application of the microtubular membranes and the corresponding microstructural requirements.

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.

Catalysts for oxygen reduction in the alkaline electrolyte based on multi-walled carbon nanotubes modified with urea and phthalocyanines of iron, cobalt and palladium were synthesized and studied. Physicochemical studies of the surface of the synthesized materials were carried out using porosimetry, Raman spectroscopy, X-ray phase analysis and X-ray photoelectron spectroscopy. The catalyst doped with metal phthalocyanines (MWCNT(Urea)_CoPc_FePc_Pd) has the largest surface area.