Nanoscale thin film electrolytes for clean energy applications

M. I. Nandasiri, R. Sanghavi, S. Kuchibhatla, S. Thevuthasan

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Ceria and zirconia based systems can be used as electrolytes to develop solid oxide fuel cells for clean energy production and to prevent air pollution by developing efficient, reliable oxygen sensors. In this study, we have used oxygen plasma assisted molecular beam epitaxy (OPA-MBE) to grow samaria doped ceria (SDC) thin films, to understand the role of dopant concentration and geometry of the films towards the ionic conduction in these films. We have also discussed the Gd doped CeO 2(GDC) and Gd stabilized ZrO 2 (GSZ) multi-layer thin films to investigate the effect of interfacial phenomena on the ionic conductivity of these hetero-structures. We found the optimum concentration to be approximately 15 mol% SmO 1-5, for achieving lowest electrical resistance in SDC thin films. The electrical resistance decreases with the increase in film thickness up to 200 nm. The results demonstrate the usefulness of this study towards establishing an optimum dopant concentration and choosing an appropriate thin film thickness to ameliorate the conductance of the SDC material system. Furthermore, we have explored the conductivity of highly oriented GDC and GSZ multilayer thin films, wherein the conductivity increased with an increase in the number of layers. The extended defects and lattice strain near the interfaces increase the density of oxygen vacancies, which leads to enhanced ionic conductivity in multi-layer thin films.

Original languageEnglish
Pages (from-to)124-131
Number of pages8
JournalNanoscience and Nanotechnology Letters
Volume4
Issue number2
DOIs
Publication statusPublished - 2012
Externally publishedYes

Fingerprint

Electrolytes
Cerium compounds
Thin films
Acoustic impedance
Ionic conductivity
Film thickness
Doping (additives)
Ionic conduction
Oxygen sensors
Multilayer films
Oxygen vacancies
Solid oxide fuel cells (SOFC)
Air pollution
Molecular beam epitaxy
Zirconia
Oxygen
Plasmas
Defects
Geometry

Keywords

  • Molecular beam epitaxy
  • Multi-layer thin films
  • Oxygen ionic conductivity
  • Samaria doped ceria
  • Solid state electrolytes

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Nandasiri, M. I., Sanghavi, R., Kuchibhatla, S., & Thevuthasan, S. (2012). Nanoscale thin film electrolytes for clean energy applications. Nanoscience and Nanotechnology Letters, 4(2), 124-131. https://doi.org/10.1166/nnl.2012.1298

Nanoscale thin film electrolytes for clean energy applications. / Nandasiri, M. I.; Sanghavi, R.; Kuchibhatla, S.; Thevuthasan, S.

In: Nanoscience and Nanotechnology Letters, Vol. 4, No. 2, 2012, p. 124-131.

Research output: Contribution to journalArticle

Nandasiri, MI, Sanghavi, R, Kuchibhatla, S & Thevuthasan, S 2012, 'Nanoscale thin film electrolytes for clean energy applications', Nanoscience and Nanotechnology Letters, vol. 4, no. 2, pp. 124-131. https://doi.org/10.1166/nnl.2012.1298
Nandasiri, M. I. ; Sanghavi, R. ; Kuchibhatla, S. ; Thevuthasan, S. / Nanoscale thin film electrolytes for clean energy applications. In: Nanoscience and Nanotechnology Letters. 2012 ; Vol. 4, No. 2. pp. 124-131.
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