Cathodic activity and interfacial stability of Y{sub 0.8}Ca{sub 0.2}Co{sub 1{minus}x}Fe{sub x}O{sub 3}/YSZ electrodes for solid oxide fuel cells
- Seoul National Univ. (Korea, Republic of)
The Fe-doped cobaltates, Y{sub 0.8}Ca{sub 0.2}Co{sub 1{minus}x}Fe{sub x}O{sub 3{minus}{delta}} (x = 0.1--0.7), were prepared and their high-temperature phase stability and cathodic activity were investigated. The perovskite/yttria-stabilized zirconia (YSZ) electrodes were fabricated via a silk printing technique. It was found that the undoped cobaltate (x = 0) is so thermally unstable that the preparation of pure perovskite phase was unsuccessful. The partial Fe-doping to Co (x = 0.1--0.7), however, gave a highly crystalline perovskite powders of an orthorhombic lattice. Among those samples of x = 0.1--0.7, the Y{sub 0.8}Ca{sub 0.2}Co{sub 0.7}Fe{sub 0.3}O{sub 3{minus}{delta}} showed the best cathodic activity which is close to that of 8 mol % YSZ (10.8 {times} 10{sup {minus}6} cm/cm-K). As a result of interfacial reaction between Y{sub 0.8}Ca{sub 0.2}Co{sub 0.7}Fe{sub 0.3}O{sub 3{minus}{delta}} and YSZ electrolyte, a spinel-type oxide was produced. But the interfacial product formation proceeded mainly during the electrode adhesion period (1200 C) whereas its growth during the cell operation (900--1000 C) was negligible.
- OSTI ID:
- 354414
- Journal Information:
- Journal of the Electrochemical Society, Vol. 146, Issue 5; Other Information: PBD: May 1999
- Country of Publication:
- United States
- Language:
- English
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