Nanoscale effects on ion conductance of oxide nanostructures

S. Thevuthasan, L. V. Saraf, S. Azad, O. A. Marina, C. M. Wang, V. Shutthanandan, D. E. McCready, A. El-Azab, J. E. Jaffe, M. H. Engelhard, C. H F Peden

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Layer-by-layer epitaxial structures of gadolinia-doped ceria and zirconia have been synthesized on Al2(0001) using oxygen plasma-assisted molecular beam epitaxy. Increase in oxygen ion conductivity is observed with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia doped ceria electrolytes. The conductivity enhancement in these layered electrolytes is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.

Original languageEnglish
Title of host publicationProceedings - Electrochemical Society
EditorsS.C. Singhal, J. Mizusaki
Pages978-985
Number of pages8
VolumePV 2005-07
Publication statusPublished - 2005
Externally publishedYes
Event9th International Symposium on Solid Oxide Fuel Cells, SOFC IX - Quebec
Duration: 15 May 200520 May 2005

Other

Other9th International Symposium on Solid Oxide Fuel Cells, SOFC IX
CityQuebec
Period15/5/0520/5/05

Fingerprint

Nanostructures
Gadolinium
Cerium compounds
Oxides
Oxygen
Ions
Electrolytes
Lattice mismatch
Yttria stabilized zirconia
Epitaxial layers
Ionic conductivity
Electric space charge
Molecular beam epitaxy
Crystal lattices
Zirconia
Screening
Plasmas
Defects

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Thevuthasan, S., Saraf, L. V., Azad, S., Marina, O. A., Wang, C. M., Shutthanandan, V., ... Peden, C. H. F. (2005). Nanoscale effects on ion conductance of oxide nanostructures. In S. C. Singhal, & J. Mizusaki (Eds.), Proceedings - Electrochemical Society (Vol. PV 2005-07, pp. 978-985)

Nanoscale effects on ion conductance of oxide nanostructures. / Thevuthasan, S.; Saraf, L. V.; Azad, S.; Marina, O. A.; Wang, C. M.; Shutthanandan, V.; McCready, D. E.; El-Azab, A.; Jaffe, J. E.; Engelhard, M. H.; Peden, C. H F.

Proceedings - Electrochemical Society. ed. / S.C. Singhal; J. Mizusaki. Vol. PV 2005-07 2005. p. 978-985.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Thevuthasan, S, Saraf, LV, Azad, S, Marina, OA, Wang, CM, Shutthanandan, V, McCready, DE, El-Azab, A, Jaffe, JE, Engelhard, MH & Peden, CHF 2005, Nanoscale effects on ion conductance of oxide nanostructures. in SC Singhal & J Mizusaki (eds), Proceedings - Electrochemical Society. vol. PV 2005-07, pp. 978-985, 9th International Symposium on Solid Oxide Fuel Cells, SOFC IX, Quebec, 15/5/05.
Thevuthasan S, Saraf LV, Azad S, Marina OA, Wang CM, Shutthanandan V et al. Nanoscale effects on ion conductance of oxide nanostructures. In Singhal SC, Mizusaki J, editors, Proceedings - Electrochemical Society. Vol. PV 2005-07. 2005. p. 978-985
Thevuthasan, S. ; Saraf, L. V. ; Azad, S. ; Marina, O. A. ; Wang, C. M. ; Shutthanandan, V. ; McCready, D. E. ; El-Azab, A. ; Jaffe, J. E. ; Engelhard, M. H. ; Peden, C. H F. / Nanoscale effects on ion conductance of oxide nanostructures. Proceedings - Electrochemical Society. editor / S.C. Singhal ; J. Mizusaki. Vol. PV 2005-07 2005. pp. 978-985
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AU - Marina, O. A.

AU - Wang, C. M.

AU - Shutthanandan, V.

AU - McCready, D. E.

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N2 - Layer-by-layer epitaxial structures of gadolinia-doped ceria and zirconia have been synthesized on Al2(0001) using oxygen plasma-assisted molecular beam epitaxy. Increase in oxygen ion conductivity is observed with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia doped ceria electrolytes. The conductivity enhancement in these layered electrolytes is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.

AB - Layer-by-layer epitaxial structures of gadolinia-doped ceria and zirconia have been synthesized on Al2(0001) using oxygen plasma-assisted molecular beam epitaxy. Increase in oxygen ion conductivity is observed with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia doped ceria electrolytes. The conductivity enhancement in these layered electrolytes is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.

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