Oxygen reduction at a stabilized zirconia interface with Y[sub 1-x]Ca[sub x]MnO[sub 3] or La[sub 1-x]Sr[sub x]MnO[sub 3] cathode materials

Conference · Sat May 01 00:00:00 EDT 1993

OSTI ID:6144569

Youngblood, G E; Pederson, L R; Bates, J L ^[1]; Rupaal, A S ^[2]

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1. Pacific Northwest Lab., Richland, WA (United States)
2. Western Washington Univ., Bellingham, WA (United States)

Impedance spectroscopy, combined with an unbonded interface cell, has been used to assess oxygen reduction behavior at interfaces between an yttria-stabilized zirconia electrolyte and perovskite or platinum cathode materials. Intrinsic oxygen reduction specific activities of Y[sub 1-x]Ca[sub x]MnO[sub 3] (x = 0.5, 0.6 and 0.7) and La[sub 1-x]Sr[sub x]MnO[sub 3] (x = 0.1 and 0.3) were determined as a function of temperature and oxygen partial pressure, independent of the interface morphology. The overall cathodic interfacial polarization consists of two or more fundamental processes. In the temperature range of 900--1000C and in air, the operating conditions for a solid oxide fuel cell, charge transfer and oxygen dissociation processes were approximately equivalent relative to the overall oxygen reduction kinetics.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6144569
• Report Number(s): PNL-SA-21637; CONF-930571-20; ON: DE93015681
• Resource Relation: Conference: 183. Electrochemical Society meeting, Honolulu, HI (United States), 16-21 May 1993
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
OXYGEN
REDUCTION
SOLID ELECTROLYTE FUEL CELLS
CATHODES
CALCIUM OXIDES
IMPEDANCE
INTERFACES
LANTHANUM OXIDES
MANGANESE OXIDES
SPECTROSCOPY
STRONTIUM OXIDES
YTTRIUM OXIDES
ZIRCONIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FUEL CELLS
LANTHANUM COMPOUNDS
MANGANESE COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
300503* - Fuel Cells- Materials
Components
& Auxiliaries