Chemical stability enhancement of doped BaCe0.9Y0.1O3-δ as an electrolyte for proton conducting SOFCs
Апстракт
BaCe0.9-xNbxY0.1O3-δ and BaCe0.9-xTaxY0.1O3-δ (where x = 0.01, 0.03 and 0.05)
powders were synthesized by solid-state reaction method to investigate the influence
of dopant and concentration on chemical stability and electrical properties of the
sintered samples. The dense electrolyte pellets were formed from the powders after
being uniaxially pressed and sintered at 1550ºC for 5h. The electrical conductivities
determined by impedance measurements in temperature range of 550-750 ºC in wet
hydrogen atmosphere showed a decreasing trend with increase of Nb and Ta
content. On the other hand, stability of the sintered samples treated in 100% CO2 at
700 ºC for 5h determined by X-ray analysis was enhanced with increased
concentrations of Nb and Ta. It was found that BaCe0.87Nb0.3Y0.1O3-δ is the optimal
composition that satisfies the opposite demands for electrical conductivity and
chemical stability, reaching 8.0.
10-3
Sm.
cm
-1
in wet hydrogen at 650 ºC compared to
1.0.
10-...2
Sm.
cm
-1
for undoped electrolyte. Similar results obtained by doping with Nb
and Ta can be explained by almost equal size and same valence of Nb and Ta
cations, as well as their similar electronegativities. The electrolyte characteristics are
strongly dependent on these properties, whereas doping with Nb showed slightly
higher conductivities for each dopant concentration.
Кључне речи:
Barium cerate, Electrolyte, SOFCИзвор:
2rd Conference of the Serbian Society for Ceramic Materials, 2013, 90-Издавач:
- Društvo za keramičke materijale Srbije
Финансирање / пројекти:
- 0-3D наноструктуре за примену у електроници и обновљивим изворима енергије: синтеза, карактеризација и процесирање (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45007)
Институција/група
Institut za multidisciplinarna istraživanjaTY - CONF AU - Radojković, Aleksandar AU - Savić, Slavica AU - Žunić, Milan AU - Branković, Zorica AU - Branković, Goran PY - 2013 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2337 AB - BaCe0.9-xNbxY0.1O3-δ and BaCe0.9-xTaxY0.1O3-δ (where x = 0.01, 0.03 and 0.05) powders were synthesized by solid-state reaction method to investigate the influence of dopant and concentration on chemical stability and electrical properties of the sintered samples. The dense electrolyte pellets were formed from the powders after being uniaxially pressed and sintered at 1550ºC for 5h. The electrical conductivities determined by impedance measurements in temperature range of 550-750 ºC in wet hydrogen atmosphere showed a decreasing trend with increase of Nb and Ta content. On the other hand, stability of the sintered samples treated in 100% CO2 at 700 ºC for 5h determined by X-ray analysis was enhanced with increased concentrations of Nb and Ta. It was found that BaCe0.87Nb0.3Y0.1O3-δ is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stability, reaching 8.0. 10-3 Sm. cm -1 in wet hydrogen at 650 ºC compared to 1.0. 10-2 Sm. cm -1 for undoped electrolyte. Similar results obtained by doping with Nb and Ta can be explained by almost equal size and same valence of Nb and Ta cations, as well as their similar electronegativities. The electrolyte characteristics are strongly dependent on these properties, whereas doping with Nb showed slightly higher conductivities for each dopant concentration. PB - Društvo za keramičke materijale Srbije C3 - 2rd Conference of the Serbian Society for Ceramic Materials T1 - Chemical stability enhancement of doped BaCe0.9Y0.1O3-δ as an electrolyte for proton conducting SOFCs SP - 90 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2337 ER -
@conference{ author = "Radojković, Aleksandar and Savić, Slavica and Žunić, Milan and Branković, Zorica and Branković, Goran", year = "2013", abstract = "BaCe0.9-xNbxY0.1O3-δ and BaCe0.9-xTaxY0.1O3-δ (where x = 0.01, 0.03 and 0.05) powders were synthesized by solid-state reaction method to investigate the influence of dopant and concentration on chemical stability and electrical properties of the sintered samples. The dense electrolyte pellets were formed from the powders after being uniaxially pressed and sintered at 1550ºC for 5h. The electrical conductivities determined by impedance measurements in temperature range of 550-750 ºC in wet hydrogen atmosphere showed a decreasing trend with increase of Nb and Ta content. On the other hand, stability of the sintered samples treated in 100% CO2 at 700 ºC for 5h determined by X-ray analysis was enhanced with increased concentrations of Nb and Ta. It was found that BaCe0.87Nb0.3Y0.1O3-δ is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stability, reaching 8.0. 10-3 Sm. cm -1 in wet hydrogen at 650 ºC compared to 1.0. 10-2 Sm. cm -1 for undoped electrolyte. Similar results obtained by doping with Nb and Ta can be explained by almost equal size and same valence of Nb and Ta cations, as well as their similar electronegativities. The electrolyte characteristics are strongly dependent on these properties, whereas doping with Nb showed slightly higher conductivities for each dopant concentration.", publisher = "Društvo za keramičke materijale Srbije", journal = "2rd Conference of the Serbian Society for Ceramic Materials", title = "Chemical stability enhancement of doped BaCe0.9Y0.1O3-δ as an electrolyte for proton conducting SOFCs", pages = "90", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2337" }
Radojković, A., Savić, S., Žunić, M., Branković, Z.,& Branković, G.. (2013). Chemical stability enhancement of doped BaCe0.9Y0.1O3-δ as an electrolyte for proton conducting SOFCs. in 2rd Conference of the Serbian Society for Ceramic Materials Društvo za keramičke materijale Srbije., 90. https://hdl.handle.net/21.15107/rcub_rimsi_2337
Radojković A, Savić S, Žunić M, Branković Z, Branković G. Chemical stability enhancement of doped BaCe0.9Y0.1O3-δ as an electrolyte for proton conducting SOFCs. in 2rd Conference of the Serbian Society for Ceramic Materials. 2013;:90. https://hdl.handle.net/21.15107/rcub_rimsi_2337 .
Radojković, Aleksandar, Savić, Slavica, Žunić, Milan, Branković, Zorica, Branković, Goran, "Chemical stability enhancement of doped BaCe0.9Y0.1O3-δ as an electrolyte for proton conducting SOFCs" in 2rd Conference of the Serbian Society for Ceramic Materials (2013):90, https://hdl.handle.net/21.15107/rcub_rimsi_2337 .