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High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition
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High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition
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Journal Article
High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition
2010
Overview
Reducing the operating temperature in the 500–750 °C range is needed for widespread use of solid oxide fuel cells (SOFCs). Proton-conducting oxides are gaining wide interest as electrolyte materials for this aim. We report the fabrication of BaZr
0.8
Y
0.2
O
3−
δ
(BZY) proton-conducting electrolyte thin films by pulsed laser deposition on different single-crystalline substrates. Highly textured, epitaxially oriented BZY films were obtained on (100)-oriented MgO substrates, showing the largest proton conductivity ever reported for BZY samples, being 0.11 S cm
−1
at 500 °C. The excellent crystalline quality of BZY films allowed for the first time the experimental measurement of the large BZY bulk conductivity above 300 °C, expected in the absence of blocking grain boundaries. The measured proton conductivity is also significantly larger than the conductivity values of oxygen-ion conductors in the same temperature range, opening new potential for the development of miniaturized SOFCs for portable power supply.
Proton conductor oxides are promising materials for their use as electrolytes for reducing the operation temperature of solid-oxide fuel cells. Epitaxially oriented yttrium-doped barium zirconate films now show unprecedented proton conductivity in the 500–700 °C range.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
