Stable high conductivity ceria/bismuth oxide bilayered electrolytes

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837390· OSTI ID:452230

Wachsman, E D; Jayaweera, P; Jiang, N; Lowe, D M; Pound, B G ^[1]

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1. SRI international, Menlo Park, CA (United States). Materials Research Center

The authors have developed a high conductivity bilayered ceria/bismuth oxide anolyte/electrolyte that uses the Po{sub 2} gradient to obtain stability at the anolyte-electrolyte interface and reduced electronic conduction due to the electrolyte region. Results in terms of solid oxide fuel cell (SOFC) performance and stability are presented. These results include a 90 to 160 mV increase in open-circuit potential, depending on temperature, with the bilayered structure as compared to SOFCs fabricated from a single ceria layer. An open-circuit potential of >1.0 V was obtained at 500 C with the bilayered structure. This increase in open-circuit potential is obtained without any measurable increase in cell resistance and is stable for over 1,400 h of testing, under both open-circuit and maximum power conditions. Moreover, SOFCs fabricated from the bilayered structure result in a 33% greater power density as compared to cells with a single ceria electrolyte layer.

• Sponsoring Organization: Gas Research Inst., Chicago, IL (United States)
• OSTI ID: 452230
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 144; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
BISMUTH OXIDES
CERIUM OXIDES
IONIC CONDUCTIVITY
OXYGEN
PARTIAL PRESSURE
PERFORMANCE
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES
STABILITY