Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs
Traditional LSM (La1-xSrxMnO3-w) SOFC cathode material shows some drawbacks operating below 800 °C, in particular poor oxygen ion conduction, which limits the active area of the electrode to the three phase boundary (TPB) between electrolyte, electrode and gas phase at the interface. A strategy to o...
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2015-05-01
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doaj-199bc575c909413fbb6f4cdf96e48f622021-02-20T21:10:33ZengAIDIC Servizi S.r.l.Chemical Engineering Transactions2283-92162015-05-014310.3303/CET1543293Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCsI. Natali SoraV. FeliceF. FontanaTraditional LSM (La1-xSrxMnO3-w) SOFC cathode material shows some drawbacks operating below 800 °C, in particular poor oxygen ion conduction, which limits the active area of the electrode to the three phase boundary (TPB) between electrolyte, electrode and gas phase at the interface. A strategy to overcome this problem consists in the development of materials with both good oxygen ion and electronic conductivity, in which oxygen ions catalytically dissociated on the surface are able to reach the electrolyte by diffusion in the bulk of the cathode. La1-xSrxFeO3-w has been proposed as possible SOFC cathode, in search for a high activity at lower temperatures with respect to LSM. The aim of the work is the structural study of alternative cathodic materials for intermediate temperature solid oxide fuel cells, mainly based on ABO3 perovskite-type lanthanum ferrite. Within this framework the effects of A (La)-site doped with Sr or B (Fe)-site doped with Ta on the crystal structures of these materials were investigated by X-ray powder diffraction (XRPD). In conjunction with the experimental results, the microscopic mechanisms of the doping effect were discussed providing deeper understanding into structure-property relations.https://www.cetjournal.it/index.php/cet/article/view/5060 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
I. Natali Sora V. Felice F. Fontana |
spellingShingle |
I. Natali Sora V. Felice F. Fontana Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs Chemical Engineering Transactions |
author_facet |
I. Natali Sora V. Felice F. Fontana |
author_sort |
I. Natali Sora |
title |
Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs |
title_short |
Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs |
title_full |
Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs |
title_fullStr |
Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs |
title_full_unstemmed |
Structural Studies of Doped Lanthanum Orthoferrites of Interest for SOFCs |
title_sort |
structural studies of doped lanthanum orthoferrites of interest for sofcs |
publisher |
AIDIC Servizi S.r.l. |
series |
Chemical Engineering Transactions |
issn |
2283-9216 |
publishDate |
2015-05-01 |
description |
Traditional LSM (La1-xSrxMnO3-w) SOFC cathode material shows some drawbacks operating below 800 °C, in particular poor oxygen ion conduction, which limits the active area of the electrode to the three phase boundary (TPB) between electrolyte, electrode and gas phase at the interface. A strategy to overcome this problem consists in the development of materials with both good oxygen ion and electronic conductivity, in which oxygen ions catalytically dissociated on the surface are able to reach the electrolyte by diffusion in the bulk of the cathode. La1-xSrxFeO3-w has been proposed as possible SOFC cathode, in search for a high activity at lower temperatures with respect to LSM. The aim of the work is the structural study of alternative cathodic materials for intermediate temperature solid oxide fuel cells, mainly based on ABO3 perovskite-type lanthanum ferrite. Within this framework the effects of A (La)-site doped with Sr or B (Fe)-site doped with Ta on the crystal structures of these materials were investigated by X-ray powder diffraction (XRPD). In conjunction with the experimental results, the microscopic mechanisms of the doping effect were discussed providing deeper understanding into structure-property relations. |
url |
https://www.cetjournal.it/index.php/cet/article/view/5060 |
work_keys_str_mv |
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