A composite electrolyte for an SOFC consisting of a ceria sheet and a zirconia film deposited by sol-gel method
The authors investigated a composite electrolyte for solid oxide fuel cells prepared by coating a ceria sheet (Ce{sub 0.8}Gd{sub 0.2}O{sub 2{minus}d} or GDC) with a scandia alumina doped zirconia (0.850ZrO{sub 2}-0.110Sc{sub 2}O{sub 3}-0.04Al{sub 2}O{sub 3}) film by the sol-gel method. The sol-gel film annealed at 1,200 C was examined by X-ray diffraction analysis and found to be in a cubic phase at room temperature. The ionic conductivity of this film is comparable to that of bulk sintered at 1,620 C. Scanning electron microscope observations revealed that the film forms a good interface with the electrolyte of the ceria sheet, even though the annealing temperature is as low as 1,200 C. They fabricated a single cell consisting of a composite electrolyte, a La{sub 0.8}Sr{sub 0.2}MnO{sub 3} cathode and a Ni-YSZ anode. The composite electrolyte consisted of zirconia film about one micron thick deposited by the sol-gel method and a 0.2 mm thick ceria sheet. A cell operated with moist H{sub 2} and O{sub 2} gas exhibited an open circuit voltage of 1.00 V at 800 C. This value is much closer to the value of 1.13 V expected from the Nernst equation than the value of 0.76 V for a cell with a ceria sheet but without the sol-gel film.
- Research Organization:
- NTT Integrated Information and Energy System Labs., Tokai, Ibaraki (JP)
- OSTI ID:
- 20019141
- Resource Relation:
- Conference: 1997 Materials Research Society Fall Meeting, Boston, MA (US), 12/01/1997--12/05/1997; Other Information: PBD: 1998; Related Information: In: Materials for electrochemical energy storage and conversion II -- Batteries, capacitors and fuel cells. Materials Research Society symposium proceedings, Volume 496, by Ginley, D.S.; Doughty, D.H.; Scrosati, B.; Takamura, T.; Zhang, Z.J. [eds.], 702 pages.
- Country of Publication:
- United States
- Language:
- English
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