Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11312
Title: A comparative study of SrCo0.8Nb0.2O3−δ and SrCo0.8Ta0.2O3−δ as low-temperature solid oxide fuel cell cathodes: effect of non-geometry factors on the oxygen reduction reaction
Authors: Li, MR
Zhou, W
Peterson, VK
Zhao, MW
Zhu, ZH
Keywords: Solid oxide fuel cells
Cathodes
Oxygen
Niobium
Tantalum
Perskovites
Oxides
Issue Date: 11-Nov-2015
Publisher: Royal Society of Chemistry
Citation: Li, M., Zhou, W., Peterson, V. K., Zhao, M., & Zhu, Z. (2015). A comparative study of SrCo0.8Nb0.2O3−δ and SrCo0.8Ta0.2O3−δ as low-temperature solid oxide fuel cell cathodes: effect of non-geometry factors on the oxygen reduction reaction. Journal of Materials Chemistry A, 3, (47), 24064-24070. doi:10.1039/C5TA07178J
Abstract: The oxygen reduction reaction (ORR) activity of cathodes has to be improved to realize the low-temperature operation of solid-oxide fuel cells (SOFCs). Whilst geometric factors are conventionally accepted to influence the ORR activity of perovskite cathodes, other factors may also contribute and therefore need to be explored. Here, we substituted 20% niobium and tantalum which have similar ionic radii into strontium cobaltites to obtain the two perovskite oxides SrCo0.8Nb0.2O3−δ (SCN20) and SrCo0.8Ta0.2O3−δ (SCT20), respectively. Our study of the isostructural SCN20 and SCT20 allows geometric effects to be separated from other factors, and we observe better cathode performance of SCT20 cathode, which may be related to the lower electronegativity of Ta5+, thus resulting in higher oxygen surface exchange kinetics and diffusivity as compared with Nb5+. © Royal Society of Chemistry 2015
URI: https://doi.org/10.1039/C5TA07178J
https://apo.ansto.gov.au/dspace/handle/10238/11312
ISSN: 2050-7496
Appears in Collections:Journal Articles

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