Proton transport properties at the grain boundary of barium zirconate based proton conductors for intermediate temperature operating SOFC

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Abstract

Proton transport properties across the grain boundary of barium zirconate based proton conductors were studied in accordance with the space charge concept. The analysis is performed at temperatures lower than 200°C using a Mott-Schottky model. The barrier height of Y- and Gd-doped barium zirconate is in the range of 0.29 to 0.57 V, which higher than that of oxygen ionic conductors. The barrier height of the space charge layer shows a dependence on the dopant type and concentration. The dependence correlates with the enrichment of the dopant at the grain boundary. The results suggest that the enrichment of the dopant decreases the barrier height and is effective to improve proton transport properties across the grain boundary.

Original languageEnglish
Pages (from-to)6265-6270
Number of pages6
JournalJournal of Materials Chemistry
Volume20
Issue number30
DOIs
Publication statusPublished - 2010 Aug 14

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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