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Enhanced ionic conductivity of Ce0.8Sm0.2O2-delta by Sr addition
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2012 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 208, 225-231 p.Article in journal (Refereed) Published
Abstract [en]

Sm and Sr co-doped ceria-based electrolyte with compositions of Ce-0.8(Sm1-xSrx)(0.2)O2-delta (x = 0, 0.3, 0.5, 0.7) are synthesized and investigated with the aim of improving the electrical properties of Ce0.8Sm0.2O2-delta. X-ray diffraction (XRD) and electron microscope (SEM and TEM) techniques are employed to characterize the microstructure of powders and sintered pellets. The ionic conductivity has been examined by the A.C. impedance spectroscopy in air. The Ce-0.8(Sm0.7Sr0.3)(0.2)O2-delta exhibits the highest bulk conductivity among the series, which can be mainly ascribed to the increase of oxygen vacancy concentration. The specific grain-boundary conductivities are observed to increase with the Sr doping content up to x = 0.5. Further increase in Sr concentration will lead to reduced specific grain-boundary conductivities. The total conductivities of all Sm and Sr co-doped ceria are higher than that of Ce0.8Sm0.2O1.9. The results indicate that Sr co-doping opens a new avenue to improve ionic conductivity in Ce0.8Sm0.2O1.9.

Place, publisher, year, edition, pages
2012. Vol. 208, 225-231 p.
Keyword [en]
Solid oxide fuel cells, Electrolyte, Co-doped, Ceria, Conductivity, Grain-boundary conductivity
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-80007DOI: 10.1016/j.jpowsour.2012.01.001ISI: 000303286500028OAI: oai:DiVA.org:su-80007DiVA: diva2:552544
Note

AuthorCount:4;

Available from: 2012-09-14 Created: 2012-09-12 Last updated: 2017-12-07Bibliographically approved

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