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06.07.2010


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Solid State Ionics
Volume 181, Issues 19-20, 16 July 2010, Pages 868-873













doi:10.1016/j.ssi.2010.05.002 | How to Cite or Link Using DOI
Copyright © 2010 Elsevier B.V. All rights reserved.
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Electrical conduction and mass transport properties of SrZr0.99Fe0.01O3  δ





Atsushi Unemotoa, Corresponding Author Contact Information, E-mail The Corresponding Author, Atsushi Kaimaib, Kazuhisa Satoc, Naoto Kitamurad, Keiji Yashiroc, Hiroshige Matsumotoe, Junichiro Mizusakic, Koji Amezawab and Tatsuya Kawadab






a Graduate School of Engineering, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan


b Graduate School of Environmental Studies, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan


c Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8579, Japan


d Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510, Japan


e Inamori Frontier Research Center, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan





Received 24 March 2010; 


revised 1 May 2010; 


accepted 4 May 2010. 


Available online 8 June 2010.







Abstract


The electrical conductivity of SrZr0.99Fe0.01O3  δ was evaluated by a four-probe ac technique. The measurements were conducted in hydrogen and in oxygen containing atmospheres at 823 ≤ T / K ≤ 1273. It was found from the X-ray absorption spectroscopic measurements that Fe in the oxide is trivalent both in hydrogen and in oxygen. In order to determine the major carrier in the oxide, gas partial pressure dependences and isotope effect of hydrogen and deuteron on the electrical conductivity was investigated. In humidified hydrogen, it was found that proton conduction is predominant in the lower temperature region while oxide ion conduction starts to contribute to the total by increasing temperature of above 1173 K. In oxygen containing gas, the protonic conduction is found to be predominant at lower temperatures while the contribution of the electron hole conduction is significant at higher temperatures. Hydrogen evolution property was evaluated using the SrZr0.99Fe0.01O3  δ disc as a solid electrolyte. Hydrogen evolution rate obeyed the Faraday's law in humidified hydrogen at 1173 K, suggesting that the transport number of ionic species is unity.





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