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

Journal Article · Tue Nov 01 00:00:00 EST 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90187-2· OSTI ID:6659598

Fletcher, J G; Irvine, J T.S.; West, A R ^[1]; Labrincha, J A; Frade, J R; Marques, F M.B. ^[2]

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1. Aberdeen Univ. (United Kingdom). Chemistry Dept.
2. Univ. de Aveiro (Portugal). Dept. de Engenharia Ceramica e do Vidro

YBa[sub 2]Cu[sub 3]O[sub 7[minus]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 YBa[sub 2]Cu[sub 3]O[sub 7[minus]x] was observed at fairly low current densities ([approx]20 mA/cm[sup 2]). Overpotentials increased as electrode firing temperature increased from 920 to 940 C due to electrode densification. At 960 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 C.

• OSTI ID: 6659598
• Journal Information: Materials Research Bulletin; (United States), Vol. 29:11; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM OXIDES
ELECTRICAL PROPERTIES
MICROSTRUCTURE
COPPER OXIDES
SOLID ELECTROLYTE FUEL CELLS
ELECTRODES
YTTRIUM OXIDES
ELECTROCHEMICAL CORROSION
FABRICATION
IONIC CONDUCTIVITY
MATERIALS TESTING
ZIRCONIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
CORROSION
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTROCHEMICAL CELLS
FUEL CELLS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TESTING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
300503* - Fuel Cells- Materials
Components
& Auxiliaries
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
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& Refractories- Structure & Phase Studies
400400 - Electrochemistry