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
- 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, Vol. 144, Issue 3; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Operating properties of solid oxide fuel cells using BaCe{sub 0.8}Gd{sub 0.2}O{sub 3{minus}{alpha}} electrolyte
Interfacial polarization characteristics of Pt{vert_bar}BaCe{sub 0.8}Gd{sub 0.2}O{sub 3}{vert_bar}Pt cells at intermediate temperatures