Oxygen exchange measurements on zirconia-yttria electrolyte surfaces modified by various dopants

Technical Report · Sat Oct 01 00:00:00 EDT 1983

OSTI ID:6228032

Tannhauser, D S; Kilner, J A; Steele, B C.H.

Yttria stabilized zirconia (YSZ) has a number of practical applications as electrolyte membrane. Current interest is focused on three main devices: oxygen monitors, high temperature fuel cells, and water electrolyzers. Little is known about factors which affect the interchange of oxygen between the ambient gas and the oxide surface. Surface perfection and purity, as well as crystalline orientation, may all play a role. In view of the growing requirement for devices to operate at low temperatures (approx. 500 C), where the surface exchange becomes very slow, it is important to understand this process. Recent experiments have suggested that surface treatment of zirconia with CeO2 may accelerate reaction kinetics at electrodes. Another series of experiments by Verkerk et al has suggested that in the low temperature regime Bi2O3 - Er2O3 has much faster transfer rate for oxygen than YSZ. Consequently, a series of experiments have been started to investigate the effects of chemical treatments on the exchange of oxygen between the surface of YSZ single crystals and oxygen in the gas phase.

• Research Organization: Imperial Coll. of Science and Technology, London (UK)
• OSTI ID: 6228032
• Report Number(s): N-84-21367
• Resource Relation: Other Information: In Brookhaven National Lab., proceedings of the conference on high temperature solid oxide electrolytes, Volume 1, 349-360, N--84-21342 11-76
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
HIGH-TEMPERATURE FUEL CELLS
SOLID ELECTROLYTES
ELECTROCHEMISTRY
ZIRCONIUM OXIDES
ANNEALING
DIFFUSION
REACTION KINETICS
SURFACE PROPERTIES
YTTRIUM OXIDES
CHALCOGENIDES
CHEMISTRY
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELECTROLYTES
FUEL CELLS
HEAT TREATMENTS
KINETICS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
300505* - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics
360204 - Ceramics
Cermets
& Refractories- Physical Properties