Thermomechanical and Electrical Properties of Pr1 – xSrxFe0.8Co0.2O3 (x = 0.3 and 0.4) and Composites Based on Them

Alexey V. Nikonov, Nikita B. Pavzderin, Vladimir Rudolfovich Khrustov, I. V. Semenova, Kairat A. Kuterbekov, Kenzhebatyr Zh. Bekmyrza

2021

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DOI 10.1134/s0020168521030110
Data confidence 70 medium
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Abstract

Abstract— Pr1 – xSrxFe0.8Co0.2O3 (PSFC) (x = 0.3, 0.4) materials and composites based on them are thought to be promising cathode materials for solid oxide fuel cells. The PSFC powders with micron-sized particles were prepared by self-propagating high-temperature synthesis. Zr0.84Y0.16O2 – δ (YSZ) and Ce0.73Gd0.27O2 – δ (GDC) nanopowders were used as a second component of the composites. It was found that at 1000°C PSFC reacts with the YSZ electrolyte to form SrZrO3, whereas there is no chemical interaction with GDC even at 1200°C. The electrical conductivity of the PSFC with x = 0.4 has been shown to be more than twice that of the material with x = 0.3. Herewith the increase of the Sr concentration in the PSFC leads to an increase of its thermal expansion coefficient (TEC), which exceeds that of GDC. The formation of PSFC/GDC composites makes it possible to achieve a better match in thermal expansion and sintering kinetics between the cathode and electrolyte materials. However, the electrical conductivity of the studied composites is a factor of 2–5 lower than that of the initial PSFC materials.