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High Total Proton Conductivity in Large-Grained Yttrium-Doped Barium Zirconate

Yamazaki, Yoshihiro and Hernandez-Sanchez, Raul and Haile, Sossina M. (2009) High Total Proton Conductivity in Large-Grained Yttrium-Doped Barium Zirconate. Chemistry of Materials, 21 (13). pp. 2755-2762. ISSN 0897-4756.

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Barium zirconate has attracted particular attention among candidate proton conducting electrolyte materials for fuel cells and other electrochemical applications because of its chemical stability, mechanical robustness, and high bulk proton conductivity. Development of electrochemical devices based on this material, however, has been hampered by the high resistance of grain boundaries, and, due to limited grain growth during sintering, the high number density of such boundaries. Here, we demonstrate a fabrication protocol based on the sol−gel synthesis of nanocrystalline precursor materials and reactive sintering that results in large-grained, polycrystalline BaZr_(0.8)Y_(0.2O3−δ) of total high conductivity, 1 × 10^(−2) Scm^(−1) at 450 °C. The detrimental role of grain boundaries in these materials is confirmed via a comparison of the conductivities of polycrystalline samples with different grain sizes. Specifically, two samples with grain sizes differing by a factor of 2.3 display essentially identical grain interior conductivities, whereas the total grain boundary conductivities differ by a factor of 2.5−3.2, depending on the temperature (with the larger-grained material displaying higher conductivity).

Item Type:Article
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Haile, Sossina M.0000-0002-5293-6252
Additional Information:Copyright © 2009 American Chemical Society. Received January 22, 2009. Revised Manuscript Received April 8, 2009. Publication Date (Web): May 20, 2009. This work was supported by the Gordon and Betty Moore Foundation and by JSPS Postdoctoral Fellowships for Research Abroad. Note Added After ASAP Publication: Due to a production error, the footnote for Table 1 was in inadvertently deleted from the article in the version of this paper published ASAP May 20, 2009; the corrected version published ASAP June 12, 2009.
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Issue or Number:13
Record Number:CaltechAUTHORS:20090901-101752179
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15519
Deposited By: George Porter
Deposited On:14 Sep 2009 21:28
Last Modified:03 Oct 2019 00:58

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