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Chemical and electrical properties of BaPr0.7Gd0.3O3δ

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Author(s)

John Thomas Sirr Irvine, A Magrasó, F Espiell, M Segarra

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Abstract

Doped perovskites have a growing interest as electrolytes for IT-SOFCs. In the search for proton conducting electrolytes, Gd-doped BaPrO3 was studied. The present work reports the chemical stability and electrical conductivity of BaPr0.7Gd0.3O3-delta powders. This system is found to be highly reactive under water, CO2 and hydrogen containing atmospheres. Comparison of the conduction behaviour measured at different atmospheres indicates that the system behaves as a p-type electronic conductor. The total conductivity is about 1 x 10(-3) S cm(-1) at 300 degrees C, in dry O-2. The resistance of the system seems to be dominated by the grain boundary contribution. However, structure investigation reveals there is a gadolinia segregation, which may act as a resistive barrier. The material is not suitable for SOFC applications due to its low stability. (c) 2007 Elsevier B.V. All rights reserved.

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Original languageEnglish
Pages (from-to)53–58
Number of pages6
JournalJournal of Power Sources
Volume169
DOIs
Publication statusPublished - 10 Jun 2007

    Research areas

  • BaPrO3, p-type conductivity, proton conductivity, electrolyte, electrode, perovskite, CONDUCTIVITY

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