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- Title
High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition.
- Authors
Pergolesi, Daniele; Fabbri, Emiliana; D'Epifanio, Alessandra; Di Bartolomeo, Elisabetta; Tebano, Antonello; Sanna, Simone; Licoccia, Silvia; Balestrino, Giuseppe; Traversa, Enrico
- Abstract
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 BaZr0.8Y0.2O3−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.
- Subjects
PROTON exchange membrane fuel cells; SOLID oxide fuel cells; CRYSTAL grain boundaries; PULSED laser deposition; BARIUM compounds
- Publication
Nature Materials, 2010, Vol 9, Issue 10, p846
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat2837