High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition

Daniele Pergolesi, Emiliana Fabbri, Alessandra D’Epifanio, Elisabetta Di Bartolomeo, Antonello Tebano, Simone Sanna, Silvia Licoccia, Giuseppe Balestrino, Enrico Traversa

Research output: Contribution to journalJournal articleResearchpeer-review

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.

Original languageEnglish
JournalNature Materials
Volume9
Pages (from-to)846-852
ISSN1476-1122
Publication statusPublished - 2010
Externally publishedYes

Cite this

Pergolesi, D., Fabbri, E., D’Epifanio, A., Di Bartolomeo, E., Tebano, A., Sanna, S., Licoccia, S., Balestrino, G., & Traversa, E. (2010). High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition. Nature Materials, 9, 846-852.