Conductive Nature of Grain Boundaries in Nanocrystalline Stabilized Bi2O3 Thin-Film Electrolyte

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Stabilized Bi2O3 has gained a considerable amount of attention as a solid electrolyte material for low temperature solid oxide fuel cells due to its superior oxygen ion conductivity at the temperature of relevance (<= 500 degrees C). Despite many research efforts to measure the transport properties of stabilized Bi2O3, the effects of grain boundaries on the electrical conductivity have rarely been reported and their results are even controversial. Here, we attempt quantitatively to assess the grain boundary contribution out of the total ionic conductivity at elevated temperatures (350-500 degrees C) by fabricating epitaxial and nano-polycrystalline thin films of yttrium-stabilized Bi2O3. Surprisingly, both epitaxial and polycrystalline films show nearly identical levels of ionic conductivity, as measured by alternating current impedance spectroscopy and this is the case despite the fact that the polyfilm possesses nanosized columnar grains and thus an extremely high density of the grain boundaries. The highly conductive nature of grain boundaries in stabilized Bi2O3 is discussed in terms of the clean and chemically uniform grain boundary without segregates, and the implications for device application are suggested.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-02
Language
English
Article Type
Article
Keywords

SOLID OXIDE ELECTROLYTES; ELECTRICAL-CONDUCTIVITY; DOPED ZIRCONIA; BISMUTH OXIDES; FUEL-CELLS; SEGREGATION; CERIA; CHARGE; TEMPERATURE; DEPOSITION

Citation

ACS APPLIED MATERIALS &amp; INTERFACES, v.10, no.7, pp.6269 - 6275

ISSN
1944-8244
DOI
10.1021/acsami.7b16875
URI
http://hdl.handle.net/10203/240969
Appears in Collection
EEW-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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