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Polarization behavior of yttrium barium copper oxide electrodes on yttria-stabilized zirconia electrolytes

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Author(s)

JG FLETCHER, AR WEST, JA LABRINCHA, J R Frade, FMB MARQUES, John Thomas Sirr Irvine

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Abstract

YBa2Cu3O7-x (YBCO) was evaluated as a potential electrode material for yttria stabilized zirconia (YSZ) based electrochemical devices, due to its high electronic conductivity and capability for oxide ion transport. YBCO electrodes were deposited by screen-printing, which requires moderately high firing temperatures to assure a good bonding and mechanical stability of the deposited layers. Unfortunately, chemical reactivity towards the YSZ electrolyte may significantly decrease electrode performance. In addition, electrochemical decomposition of YBa2Cu3O7-x was observed at fairly low current densities (almost-equal-to 20 mA/cm2). Overpotentials increased as electrode firing temperature increased from 920 to 940-degrees-C due to electrode densification. At 960-degrees-C, the onset of chemical degradation was observed but overpotential losses were lowest for these firing conditions. Microstructural examination indicated that partial degradation during sintering had allowed a more porous microstructure to develop at 960-degrees-C.

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Details

Original languageEnglish
Pages (from-to)1175-1182
Number of pages8
JournalMaterials Research Bulletin
Volume29
Issue number11
DOIs
Publication statusPublished - Nov 1994

    Research areas

  • OXIDE, COPPER, BARIUM, ELECTRODE, CATHODE, FUEL-CELLS, YTTRIUM

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