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 language | English |
|---|---|
| Pages (from-to) | 1-7 |
| Number of pages | 7 |
| Journal | Acta Materialia |
| Volume | 60 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2012 Jan 1 |
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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 journal › Article
}
TY - JOUR
T1 - Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor
AU - Shim, Joon Hyung
AU - Park, Joong Sun
AU - Holme, Timothy P.
AU - Crabb, Kevin
AU - Lee, Wonyoung
AU - Kim, Young Beom
AU - Tian, Xu
AU - Gür, Turgut M.
AU - Prinz, Fritz B.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - 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.
AB - 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.
KW - Grain boundary
KW - Secondary ion mass spectrometry
KW - Yttria stabilized zirconia
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U2 - 10.1016/j.actamat.2011.09.050
DO - 10.1016/j.actamat.2011.09.050
M3 - Article
VL - 60
SP - 1
EP - 7
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 1
ER -