Proton-Conducting Oxides
Top Cited Papers
- 1 August 2003
- journal article
- Published by Annual Reviews in Annual Review of Materials Research
- Vol. 33 (1), 333-359
- https://doi.org/10.1146/annurev.matsci.33.022802.091825
Abstract
▪ Abstract The structural and chemical parameters determining the formation and mobility of protonic defects in oxides are discussed, and the paramount role of high-molar volume, coordination numbers, and symmetry are emphasized. Symmetry also relates to the structural and chemical matching of the acceptor dopant. Y-doped BaZrO3-based oxides are demonstrated to combine high stability with high proton conductivity that exceeds the conductivity of the best oxide ion conductors at temperatures below about 700°C. The unfavorably high grain boundary impedances and brittleness of ceramics have been reduced by forming solid solutions with small amounts of BaCeO3, and an initial fuel cell test has demonstrated that proton-conducting electrolytes based on Y-doped BaZrO3provide alternatives for separator materials in solid oxide fuel cells (SOFCs). These materials have the potential to operate at lower temperatures compared with those of conventional SOFCs, and the appearance of chemical water diffusion across the electrolyte at typical operation temperatures (T = 500–800°C) allows the use of dry methane as a fuel.Keywords
This publication has 46 references indexed in Scilit:
- Some factors that determine proton conductivity in nonstoichiometric complex perovskitesSolid State Ionics, 1999
- Aspects of the formation and mobility of protonic charge carriers and the stability of perovskite-type oxidesSolid State Ionics, 1999
- Muon diffusion and trapping in proton conducting oxidesSolid State Ionics, 1998
- Investigation of the influence of zirconium substitution on the properties of neodymium-doped barium ceratesSolid State Ionics, 1997
- High proton conductivity in barium yttrium stannate Ba2YSnO5.5Solid State Ionics, 1997
- The thermodynamic properties of BaCeO3 at temperatures from 5 to 940 KThermochimica Acta, 1995
- Performance of Solid Oxide Fuel Cell Using Proton and Oxide Ion Mixed Conductors Based on BaCe1 − x Sm x O 3 − αJournal of the Electrochemical Society, 1993
- Proton conductive properties of gadolinium-doped barium cerates at high temperaturesSolid State Ionics, 1992
- High temperature proton conducting oxides and their applications to solid electrolyte fuel cells and steam electrolyzer for hydrogen productionSolid State Ionics, 1988
- Über die elektrolytische Leitung fester Körper bei sehr hohen TemperaturenZeitschrift für Elektrochemie, 1899