Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor

Joon Hyung Shim, Joong Sun Park, Timothy P. Holme, Kevin Crabb, Wonyoung Lee, Young Beom Kim, Xu Tian, Turgut M. Gür, Fritz B. Prinz

Research output: Contribution to journalArticle

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Abstract

This study reports spectrometric and spectroscopic evidence indicating a pronounced role of surface grain boundaries in enhancing oxygen incorporation on oxide ion conducting ceramic yttria stabilized zirconia (YSZ). Oxygen isotope exchange measurements were carried out using high spatial resolution (50 nm) secondary ion mass spectrometry (SIMS) under cathodically biased conditions as well as on bare YSZ surface. Surface mapping of the 18O distribution by SIMS clearly shows high activity at surface grain boundaries, suggesting that these boundary regions provide preferential pathways for oxygen incorporation into YSZ in both cases, albeit the effect is less pronounced without bias. The results are supported by a.c. impedance spectroscopy measurements conducted on polycrystalline YSZ membranes with surface grains engineered for different sizes, which indicate that smaller grains (i.e. higher grain boundary densities) exhibit lower electrode impedances. These results open up the possibility of engineering nanostructured YSZ surfaces containing a high density of grain boundaries to achieve enhanced performance of electrochemical devices, particularly for solid oxide fuel cells operating at low temperatures.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalActa Materialia
Volume60
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1

Fingerprint

Yttria stabilized zirconia
Oxides
Grain boundaries
Ions
Oxygen
Secondary ion mass spectrometry
Oxygen Isotopes
Solid oxide fuel cells (SOFC)
Isotopes
Ion exchange
Spectroscopy
Membranes
Electrodes
Temperature

Keywords

  • Grain boundary
  • Secondary ion mass spectrometry
  • Yttria stabilized zirconia

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor. / Shim, Joon Hyung; Park, Joong Sun; Holme, Timothy P.; Crabb, Kevin; Lee, Wonyoung; Kim, Young Beom; Tian, Xu; Gür, Turgut M.; Prinz, Fritz B.

In: Acta Materialia, Vol. 60, No. 1, 01.01.2012, p. 1-7.

Research output: Contribution to journalArticle

Shim, JH, Park, JS, Holme, TP, Crabb, K, Lee, W, Kim, YB, Tian, X, Gür, TM & Prinz, FB 2012, 'Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor', Acta Materialia, vol. 60, no. 1, pp. 1-7. https://doi.org/10.1016/j.actamat.2011.09.050
Shim, Joon Hyung ; Park, Joong Sun ; Holme, Timothy P. ; Crabb, Kevin ; Lee, Wonyoung ; Kim, Young Beom ; Tian, Xu ; Gür, Turgut M. ; Prinz, Fritz B. / Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor. In: Acta Materialia. 2012 ; Vol. 60, No. 1. pp. 1-7.
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