On the conduction pathway for protons in nanocrystalline yttria-stabilized zirconia
Literature Information
Sangtae Kim, Hugo J. Avila-Paredes, Shizhong Wang, Chien-Ting Chen, Roger A. De Souza, Manfred Martin, Zuhair A. Munir
In this communication we elucidate a microstructural picture of proton conduction in nano-crystalline yttria-stabilized zirconia at low temperatures (Kim et al. Adv. Mater., 2008, 20, 556). Based on careful analysis of electrical impedance spectra obtained from samples with grain sizes of ∼13 and ∼100 nm under both wet and dry atmospheres over a wide range of temperatures (room temperature–500 °C), we were able to identify the pathway for proton conduction in this material. It was found that the grain boundaries in nano-crystalline yttria-stabilized zirconia are highly selective for ion transport, being conductive for proton transport but resistive for oxygen-ion transport.
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