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

doi:10.1016/j.actamat.2011.09.050

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 journal › Article › peer-review

85 Citations (Scopus)

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	https://doi.org/10.1016/j.actamat.2011.09.050
Publication status	Published - 2012 Jan

Bibliographical note

Funding Information:
We are grateful to Dr. Yunbin Guan and Prof. John Eiler of the Geology Department at California Institute of Technology for their assistance and collaboration on the NanoSIMS work. T.M.G. and F.B.P. gratefully acknowledge partial support from the Center on Nanostructuring for Efficient Energy Conversion at Stanford University, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001060.Financial support through an ONR (TXDAD) (N00014-08-1-0544) Grant is also gratefully acknowledged. J.S.P was partially supported by a Samsung Scholarship.

Keywords

Grain boundary
Secondary ion mass spectrometry
Yttria stabilized zirconia

ASJC Scopus subject areas

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

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10.1016/j.actamat.2011.09.050

Cite this

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title = "Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor",

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.",

keywords = "Grain boundary, Secondary ion mass spectrometry, Yttria stabilized zirconia",

author = "Shim, {Joon Hyung} and Park, {Joong Sun} and Holme, {Timothy P.} and Kevin Crabb and Wonyoung Lee and Kim, {Young Beom} and Xu Tian and G{\"u}r, {Turgut M.} and Prinz, {Fritz B.}",

note = "Funding Information: We are grateful to Dr. Yunbin Guan and Prof. John Eiler of the Geology Department at California Institute of Technology for their assistance and collaboration on the NanoSIMS work. T.M.G. and F.B.P. gratefully acknowledge partial support from the Center on Nanostructuring for Efficient Energy Conversion at Stanford University, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001060.Financial support through an ONR (TXDAD) (N00014-08-1-0544) Grant is also gratefully acknowledged. J.S.P was partially supported by a Samsung Scholarship.",

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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.

N1 - Funding Information: We are grateful to Dr. Yunbin Guan and Prof. John Eiler of the Geology Department at California Institute of Technology for their assistance and collaboration on the NanoSIMS work. T.M.G. and F.B.P. gratefully acknowledge partial support from the Center on Nanostructuring for Efficient Energy Conversion at Stanford University, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001060.Financial support through an ONR (TXDAD) (N00014-08-1-0544) Grant is also gratefully acknowledged. J.S.P was partially supported by a Samsung Scholarship.

PY - 2012/1

Y1 - 2012/1

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.

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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