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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Tiwari, Pankaj
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article
La and Ca-doped A-site deficient strontium titanates anode for electrolyte supported direct methane solid oxide fuel cell
Abstract
Nickel-yttria stabilized zirconia (Ni-YSZ) cermet anodes for solid oxidefuel cells (SOFC) possesses excellent catalytic propertiesand stability for H<sub>2</sub> oxidation but not for hydrocarbons as it results in fast carbon deposition in absence of excess steam. In the present work,A-site deficient porous LSCT<sub>A-</sub> (La<sub>0.2</sub>Sr<sub>0.25</sub>Ca<sub>0.45</sub>TiO<sub>3</sub>)anode has been fabricated using the environment friendly, aqueous tapecasting method followed by the same procedure forthe dense YSZ electrolyte and YSZ porous scaffoldas cathode matrix. The anode, electrolyte, and porous cathode matrixhavebeen laminated together and sintered up to 1350°C.After sintering, nitrate precursors of La, Sr, Co and Fe are infiltratedinside the porous YSZ cathode matrix to form theperovskite phases of La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3</sub> (LSC) and La<sub>0.8</sub>Sr<sub>0.2</sub>FeO<sub>3</sub> (LSF). The as fabricated electrolyte supported SOFCs have been tested in H<sub>2</sub> and CH<sub>4</sub> fuel at 800°C. The electrolyte supported cell 15%LSF-5% LSC-YSZ/YSZ/4%Ni-6%CeO<sub>2</sub>-LSCT<sub>A-</sub> gives maximum power density of 328 mW cm<sup>−2</sup> for 3 h in H<sub>2</sub>, but in CH<sub>4</sub> the performance decreased to 165 mW cm<sup>−2</sup> even though a sustained open circuit voltage of ∼1 V obtained during H<sub>2</sub> and CH<sub>4</sub> operation. The morphology of the anode before and after cell testing has been analyzed using scanning electron microscopefollowed by X-ray diffraction studies to understand phase changes during fabrication and testing.