GDC-Infiltrated La<sub>0.3</sub>Ca<sub>0.7</sub>Fe<sub>0.7</sub>Cr<sub>0.3</sub>O<sub>3-</sub> <sub>δ</sub> Symmetrical Oxygen Electrodes for Reversible SOFCs
Notice bibliographique
Résumé
There is great interest in the development of reversible fuel cells, particularly reversible solid oxide fuel cells (RSOFCs). RSOFCs can run in both the electrolysis mode (SOEC) to electrolyze H2O to H2 or co-electrolyze CO2 and H2O to syngas when excess electricity is available, and then run in the fuel cell mode (SOFC) to convert H2 or syngas to electricity and heat when energy is needed. The primary goal of this work has been to develop new materials for highly efficient electrolyte-supported RSOFCs, based on La0.3M0.7Fe0.7Cr0.3O3- δ (M = Sr, Ca) mixed ionic-electronic conducting perovskite electrodes, with a particular forcus onLa0.3Sr0.7Cr0.3Fe0.7O3-δ (LSFCr) and La0.3Ca0.7Cr0.3Fe0.7O3-δ (LCFCr) operating in air at 600-800 oC. The specific goal of this work is to employ LSFCr and LCFCr as both the air and fuel electrodes in both the SOFC and SOEC modes, thus significantly lowering cost and simplifying the manufacturing process. Because of the excellent performance of LSFC [1] as an air electrode, efforts are now focussed on further improving its performance in air and also in fuel environments. For this reason, the A-site of the perovskite was doped with Ca in place of Sr, primarily to decrease the thermal expansion coefficient of the perovskite to more closely match that of the most commonly used electrolytes [2]. Although relatively low electrode polarization resistances were obtained with porous LSFCr [1] and LCFCr [2] electrodes, further improvement of the electrochemical performance would still be possible through microstructural modifications. Since the electrochemical performance of these mixed electronic and ionic conductors (MIECs) depends on the double phase boundary (DPB) area of the MIEC/electrolyte interface, in this study, an attempt was made to further enhance the DPB area by infiltrating the porous MIEC electrode with the electrolyte material (Gadolinia doped Ceria, GDC). To achieve this goal, a polymeric GDC solution precursor, which has the ability to form an interconnected film [3], was infiltrated into a previously sintered porous La0.3M0.7Fe0.7Cr0.3O3- δ scaffold structure. Two types of electrolyte supported symmetrical cells were used in this study. In Type 1, LSFCr and LCFCr were screen-printed on both sides of a 250 µm thick GDC electrolyte-support, followed by firing at 1100 oC in air. A second set of cells was then infiltrated with a polymeric GDC precursor (Type 2).The performance of these half cells, operated at 600-800 oC in air, was then investigated. The initial impedance spectroscopy results showed that GDC infiltration resulted in a ca. 3 fold decrease in the polarization resistance of the MIEC electrodes in air at 800 °C. The 0.06 Ω.cm2 polarization resistance obtained for these electrodes at this temperature is a strong indication that polymeric GDC precursor infiltration into MIEC electrodes is a promising approach for the fabrication of very high performance RSOFC electrodes. Acknowledgements: We are very grateful to the SOFC Canada NSERC Strategic Research Network, as well as Carbon Management Canada, for the support of this work. . References: [1] M. Chen, S. Paulson, V. Thangadurai and V. Birss, J. Power Sources, 236 (2013) 68. [2] B. Molero-Sanchez, J. Prado-Gonjal, , D. Ávila-Brande, M. Chen, E. Morán, E. and V. Birss, International Journal of Hydrogen Energy-Accepted, (2014). [3] A. Buyukaksoy, V. Petrovsky and F. Dogan, J. Electrochem. Soc., 160 (2013) F482.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».