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Defects and transport in PrxCe1−xO2−δ: Composition trends

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Abstract

Nonstoichiometric mixed ionic and electronic conductors (MIECs) find use as oxygen permeation membranes, cathodes in solid oxide fuel cells, oxygen storage materials in three-way catalysts, and chemoresistive gas sensors. Praseodymium–cerium oxide (PrxCe1-xO2-δ) solid solutions exhibit MIEC behavior in a relatively high and readily accessible oxygen partial pressure (PO2) regime and as such serve as model systems for investigating the correlation between thermodynamic and kinetic properties as well as exhibiting high performance figures of merit in the above applications. In this paper, we extend recently published results for Pr0.1Ce0.9O2-δ to include values of x 5 0, 0.002, 0.008, 0.1, and 0.20 (in PrxCe1-xO2-δ) to test how both defect and transport parameters depend on Pr fraction. Important observed trends with increasing x include increases in oxygen ion migration energy and MIEC and reductions in vacancy formation and Pr ionization energies. The implications these changes have for potential applications of PrxCe1-xO2-δ are discussed.

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Acknowledgment

This research was funded by the Division of Materials Research, National Science Foundation under the Material World Network (DMR-0908627) in collaboration with Prof. Ralf Moos, Universität Bayreuth. S.R.B. recognizes partial support from I2CNER, supported by the World Premier International Research Center Initiative, MEXT, Japan. H.L.T. thanks I2CNER for hosting his visit during the time this manuscript was prepared. The authors wish to thank the reviewer for identifying potential intrinsic electronic conduction for undoped ceria in high pO2.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA

    Sean R. Bishop, Todd S. Stefanik & Harry L. Tuller

  2. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Nishi-ku Fukuoka, 819-0395, Japan

    Sean R. Bishop

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  1. Sean R. Bishop
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Correspondence to Sean R. Bishop.

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Bishop, S.R., Stefanik, T.S. & Tuller, H.L. Defects and transport in PrxCe1−xO2−δ: Composition trends. Journal of Materials Research 27, 2009–2016 (2012). https://doi.org/10.1557/jmr.2012.130

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