Effect of redox treatments on Ce0.50Zr0.50O2 based solid oxide fuel cell anodes
| Autor: | Alessandro Trovarelli, Jordi Llorca, Alfonsina Pappacena, Marta Boaro, Chiara Abate, Matteo Ferluga |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Piles de combustible d'òxid sòlid
Materials science Renewable Energy Sustainability and the Environment Ceria-zirconia Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element Electrolyte Copper anode Solid oxide fuel cells Pyrochlore phase Redox Copper Anode Energies::Energia elèctrica [Àrees temàtiques de la UPC] chemistry.chemical_compound chemistry Electrode Solid oxide fuel cell SOFC Electrical and Electronic Engineering Physical and Theoretical Chemistry Redox tolerance Yttria-stabilized zirconia |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya Universitat Jaume I UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | This work investigates the activity of copper modified Ce0.50Zr0.50O2 (Cu-CZ) based anodes prepared through subsequent impregnation steps into a porous YSZ matrix. The ceria zirconia oxide was reduced at increasing temperatures and the effect of structural changes on anode performance investigated at 973 K under humidified H-2. Performance of all cells increased after one redox cycle due to a decrease of both the anode polarization and the ohmic resistance of the cell. The redox behaviour of Cu-CZ anode was investigated in a symmetrical cell configuration and it was observed that subsequent redox cycles lead to an activation and stabilization of the electrodes. SEM and EIS characterizations showed that this is mainly attributable to a rearrangement of the morphology and microstructure of the CZ oxide at the electrode/electrolyte interface and to an improvement of copper distribution into the porous electrode matrix. It is inferred that the interplay of copper and CZ favours the promotion of anode activity by increasing the number of active sites; moreover it stabilizes the redox behaviour of the electrode. An optimization of electrical and structural properties of Cu-CZ composites was also discussed. (C) 2014 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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