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Abstract
A solid solution with the cubic perovskite structure was observed for SrFe1-xTixO3-delta (x = 0-0.3), with an increase in the lattice parameters noted upon increasing dopant concentration. Material stability in air was observed for all compounds, with a decrease in conductivity noted upon increasing dopant concentration attributed to a reduction in charge carrier concentration. A reduction in weight proportional to the titanium content was observed upon exposure to 5% H-2/Ar, although reduction at 700 degrees C was observed to elicit a structural transitions and the formation of a secondary phase for samples SrFeO3-delta and SrFe0.9Ti0.1O3-delta respectively. Conductivity measurements at 600 degrees C demonstrated a larger decrease in the conductivity with increasing dopant concentration, while all investigated oxides are stable after reducing in 5% H-2/Ar at 600 degrees C. It was found that the conductivity of SrFe0.8Ti0.2O3-delta and SrFe0.7Ti0.3O3-delta in 5% H-2/Ar is insufficient to be used as anode for SOFCs. In the investigated compositions, SrFe0.9Ti0.1O3-delta exhibits desired conductivity and redox stability, reduced thermal expansion coefficient compared to SrFeO3-delta, which is a promising redox stable anode for IT-SOFCs. (C) 2015 Elsevier Masson SAS. All rights reserved.
Original language | English |
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Pages (from-to) | 62-70 |
Number of pages | 9 |
Journal | Solid State Sciences |
Volume | 46 |
Early online date | 19 May 2015 |
DOIs | |
Publication status | Published - Aug 2015 |
Keywords
- Conductivity
- Perovskite
- Strontium ferrite
- Anode
- Solid oxide fuel cell
- FUEL-CELLS
- ANODE MATERIALS
- NEUTRON-DIFFRACTION
- MOSSBAUER
- CATHODE
- SYSTEM
- NONSTOICHIOMETRY
- ELECTRODES
- OXIDATION
- CRYSTAL
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- 1 Finished
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Advancing Biogas Utilization SOFC: Advancing Biogas Utilization through the Fuel Flexible SOFC
Irvine, J. T. S. (PI)
1/09/11 → 28/02/15
Project: Standard