Nb doped BaCe0.9Y0.1O2.95 (BCY) powders were synthesized by both solid state reaction (SSR) and autocombustion reaction (ACR) method to investigate how different synthesis routes influence the properties of the powders and sintered samples. The powders were uniaxially pressed and sintered at 1550 degrees C to form dense electrolyte samples. Stability of BCY in CO2 can be increased by doping with Nb, but at the same time its electrical conductivities are reduced to a certain extent. It was shown that conductivities depended on both mechanism of defect formation, lattice parameters and microstructure of the electrolytes. Finer, less agglomerated powders were obtained by the method of autocombustion. SEM analysis revealed somewhat larger average grain size of the sintered samples synthesized by the ACR method. Total electrical conductivities were determined by electrochemical impedance spectroscopy (EIS) measurements in temperature range from 550 degrees C to 750 degrees C in a wet argon ...atmosphere. Again, higher conductivities were observed for the samples obtained by the ACR method and in some cases the relative difference in conductivity exceeds 20%. Thus, a certain improvement of electrolyte properties can be achieved by this method compared to the classical solid- state reaction route.
Keywords:
Ionic conduction / Fuel cells / Chemical synthesis
Source:
Journal of Alloys and Compounds, 2014, 583, 278-284
TY - JOUR
AU - Radojković, Aleksandar
AU - Savić, Slavica M.
AU - Perać, Sanja
AU - Branković, Zorica
AU - Branković, Goran
PY - 2014
UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/762
AB - Nb doped BaCe0.9Y0.1O2.95 (BCY) powders were synthesized by both solid state reaction (SSR) and autocombustion reaction (ACR) method to investigate how different synthesis routes influence the properties of the powders and sintered samples. The powders were uniaxially pressed and sintered at 1550 degrees C to form dense electrolyte samples. Stability of BCY in CO2 can be increased by doping with Nb, but at the same time its electrical conductivities are reduced to a certain extent. It was shown that conductivities depended on both mechanism of defect formation, lattice parameters and microstructure of the electrolytes. Finer, less agglomerated powders were obtained by the method of autocombustion. SEM analysis revealed somewhat larger average grain size of the sintered samples synthesized by the ACR method. Total electrical conductivities were determined by electrochemical impedance spectroscopy (EIS) measurements in temperature range from 550 degrees C to 750 degrees C in a wet argon atmosphere. Again, higher conductivities were observed for the samples obtained by the ACR method and in some cases the relative difference in conductivity exceeds 20%. Thus, a certain improvement of electrolyte properties can be achieved by this method compared to the classical solid- state reaction route.
PB - Elsevier Science Sa, Lausanne
T2 - Journal of Alloys and Compounds
T1 - Improved electrical properties of Nb doped BaCe0.9Y0.1O2.95 electrolyte for intermediate temperature SOFCs obtained by autocombustion method
EP - 284
SP - 278
VL - 583
DO - 10.1016/j.jallcom.2013.08.189
ER -
@article{
author = "Radojković, Aleksandar and Savić, Slavica M. and Perać, Sanja and Branković, Zorica and Branković, Goran",
year = "2014",
abstract = "Nb doped BaCe0.9Y0.1O2.95 (BCY) powders were synthesized by both solid state reaction (SSR) and autocombustion reaction (ACR) method to investigate how different synthesis routes influence the properties of the powders and sintered samples. The powders were uniaxially pressed and sintered at 1550 degrees C to form dense electrolyte samples. Stability of BCY in CO2 can be increased by doping with Nb, but at the same time its electrical conductivities are reduced to a certain extent. It was shown that conductivities depended on both mechanism of defect formation, lattice parameters and microstructure of the electrolytes. Finer, less agglomerated powders were obtained by the method of autocombustion. SEM analysis revealed somewhat larger average grain size of the sintered samples synthesized by the ACR method. Total electrical conductivities were determined by electrochemical impedance spectroscopy (EIS) measurements in temperature range from 550 degrees C to 750 degrees C in a wet argon atmosphere. Again, higher conductivities were observed for the samples obtained by the ACR method and in some cases the relative difference in conductivity exceeds 20%. Thus, a certain improvement of electrolyte properties can be achieved by this method compared to the classical solid- state reaction route.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "Improved electrical properties of Nb doped BaCe0.9Y0.1O2.95 electrolyte for intermediate temperature SOFCs obtained by autocombustion method",
pages = "284-278",
volume = "583",
doi = "10.1016/j.jallcom.2013.08.189"
}
Radojković, A., Savić, S. M., Perać, S., Branković, Z.,& Branković, G.. (2014). Improved electrical properties of Nb doped BaCe0.9Y0.1O2.95 electrolyte for intermediate temperature SOFCs obtained by autocombustion method. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 583, 278-284.
https://doi.org/10.1016/j.jallcom.2013.08.189
Radojković A, Savić SM, Perać S, Branković Z, Branković G. Improved electrical properties of Nb doped BaCe0.9Y0.1O2.95 electrolyte for intermediate temperature SOFCs obtained by autocombustion method. in Journal of Alloys and Compounds. 2014;583:278-284.
doi:10.1016/j.jallcom.2013.08.189 .
Radojković, Aleksandar, Savić, Slavica M., Perać, Sanja, Branković, Zorica, Branković, Goran, "Improved electrical properties of Nb doped BaCe0.9Y0.1O2.95 electrolyte for intermediate temperature SOFCs obtained by autocombustion method" in Journal of Alloys and Compounds, 583 (2014):278-284,
https://doi.org/10.1016/j.jallcom.2013.08.189 . .
