| Title |
Samples of Ba1-xSrxCe0.9Y0.1O3-d, 0 < x < 0.1, with improved chemical stability in CO2-H2 gas-involving atmospheres as potential electrolytes for a proton ceramic fuel cell / |
| Authors |
Dudek, Magdalena ; Lis, Bartolomiej ; Lach, Radoslaw ; Daugėla, Saulius ; Šalkus, Tomas ; Kežionis, Algimantas ; Mosialek, Michal ; Sitarz, Maciej ; Rapacz-Kmita, Alicja ; Grzywacz, Przemysław |
| DOI |
10.3390/ma13081874 |
| Full Text |
|
| Is Part of |
Materials.. Basel : MDPI. 2020, vol. 13, iss. 8, art. no. 1874, p. [1-18].. eISSN 1996-1944 |
| Keywords [eng] |
high temperature ceramic proton conductors ; BaCe0.9Y0.1O3 ; broadband impedance spectroscopy |
| Abstract [eng] |
Comparative studies were performed on variations in the ABO3 perovskite structure, chemical stability in a CO2-H2 gas atmosphere, and electrical conductivity measurements in air, hydrogen, and humidity-involving gas atmospheres of monophase orthorhombic Ba1-xSrxCe0.9Y0.1O3-d samples, where 0 < x < 0.1. The substitution of strontium with barium resulting in Ba1-xSrxCe0.9Y0.1O3-d led to an increase in the specific free volume and global instability index when compared to BaCe0.9Y0.1O3-d. Reductions in the tolerance factor and cell volume were found with increases in the value of x in Ba1-xSrxCe0.9Y0.1O3-d. Based on the thermogravimetric studies performed for Ba1-xSrxCe0.9Y0.1O3-d, where 0 < x < 0.1, it was found that modified samples of this type exhibited superior chemical resistance in a CO2 gas atmosphere when compared to BaCe0.9Y0.1O3-d. The application of broadband impedance spectroscopy enabled the determination of the bulk and grain boundary conductivity of Ba1-xSrxCe0.9Y0.1O3-d samples within the temperature range 25–730 oC. It was found that Ba0.98Sr0.02Ce0.9Y0.1O3-d exhibited a slightly higher grain interior and grain boundary conductivity when compared to BaCe0.9Y0.1O3-d. The Ba0.95Sr0.05Ce0.9Y0.1O3-d sample also exhibited improved electrical conductivity in hydrogen gas atmospheres or atmospheres involving humidity. The greater chemical resistance of Ba1-xSrxCe0.9Y0.1O3-d, where x = 0.02 or 0.05, in a CO2 gas atmosphere is desirable for application in proton ceramic fuel cells supplied by rich hydrogen processing gases. |
| Published |
Basel : MDPI |
| Type |
Journal article |
| Language |
English |
| Publication date |
2020 |
| CC license |
|
