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Comparative studies were performed on variations in the ABO 3 perovskite structure, chemical stability in a CO 2 -H 2 gas atmosphere, and electrical conductivity measurements in air, hydrogen, and humidity-involving gas atmospheres of monophase orthorhombic Ba 1-x Sr x Ce 0.9 Y 0.1 O 3-δ samples, where 0 &lt; x &lt; 0.1. The substitution of strontium with barium resulting in Ba 1-x Sr x Ce 0.9 Y 0.1 O 3-δ led to an increase in the specific free volume and global instability index when compared to BaCe 0.9 Y 0.1 O 3-δ . Reductions in the tolerance factor and cell volume were found with increases in the value of x in Ba 1-x Sr x Ce 0.9 Y 0.1 O 3-δ . Based on the thermogravimetric studies performed for Ba 1-x Sr x Ce 0.9 Y 0.1 O 3-δ , where 0 &lt; x &lt; 0.1, it was found that modified samples of this type exhibited superior chemical resistance in a CO 2 gas atmosphere when compared to BaCe 0.9 Y 0.1 O 3-δ . The application of broadband impedance spectroscopy enabled the determination of the bulk and grain boundary conductivity of Ba 1-x Sr x Ce 0.9 Y 0.1 O 3-δ samples within the temperature range 25-730 °C. It was found that Ba 0.98 Sr 0.02 Ce 0.9 Y 0.1 O 3-δ exhibited a slightly higher grain interior and grain boundary conductivity when compared to BaCe 0.9 Y 0.1 O 3-δ . The Ba 0.95 Sr 0.05 Ce 0.9 Y 0.1 O 3-δ sample also exhibited improved electrical conductivity in hydrogen gas atmospheres or atmospheres involving humidity. The greater chemical resistance of Ba 1-x Sr x Ce 0.9 Y 0.1 O 3-δ , where x = 0.02 or 0.05, in a CO 2 gas atmosphere is desirable for application in proton ceramic fuel cells supplied by rich hydrogen processing gases.

materials

Samples of Ba1−xSrxCe0.9Y0.1O3−δ, 0 &lt; x &lt; 0.1, with Improved Chemical Stability in CO2-H2 Gas-Involving Atmospheres as Potential Electrolytes for a Proton Ceramic Fuel Cell