Electrochemical properties of BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} electrolyte films deposited on Ni-BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} substrates

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837526· OSTI ID:483793

Agarwal, V; Liu, M ^[1]

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1. Georgia Inst. of Tech., Atlanta, GA (United States)

Solid oxide fuel cells (SOFCs) based on BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} (BCG) electrolyte films are constructed and tested at intermediate temperatures (700 to 800 C) using hydrogen as fuel and air as oxidant. The ionic and electronic conductivities as well as the interfacial properties of the BCG electrolyte films, as deposited on Ni-BCG substrates, are also determined from impedance and open-cell voltage measurements. Results indicate that the performance of the fuel cells is very sensitive to materials selection and to processing. Diffusion of Ni from substrates into the BCG electrolyte films during processing increases not only the bulk and interfacial resistances but also the electronic transference numbers of the electrolyte films, resulting in reduced open-cell voltages and poor power output. The performance of solid oxide fuel cells based on BCG electrolyte films may be substantially improved, however, by avoiding Ni diffusion into BCG electrolyte through proper selection of materials and modifications in processing.

• Sponsoring Organization: Electric Power Research Inst., Palo Alto, CA (United States); National Science Foundation, Washington, DC (United States)
• OSTI ID: 483793
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 144; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
BARIUM OXIDES
CERIUM OXIDES
DIFFUSION
ELECTRICAL PROPERTIES
ELECTROCHEMISTRY
GADOLINIUM OXIDES
HYDROGEN FUEL CELLS
NICKEL
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES
SUBSTRATES