Doped PrMnO{sub 3} perovskite oxide as a new cathode of solid oxide fuel cells for low temperature operation
- Oita Univ. (Japan)
Cathodic over potentials of Ln{sub 0.6}Sr{sub 0.4}MnO{sub 3} (Ln = La, Pr, Nd, Sm, Gd, Yb, and Y) were studied for a new cathode of solid oxide fuel cell (SOFC). Cathodic over potentials as well as the electrical conductivity strongly depended on the rare earth cations used for the A sites of perovskite oxide. Strontium doped PrMnO{sub 3} exhibited the highest electrical conductivity among the examined perovskite oxide containing Mn for B sites. Moreover, over potentials of Sr-doped PrMnO{sub 3} cathode maintained low values in spite of decreasing the operating temperature. Consequently, almost the same power density of SOFC with La{sub 0.6}Sr{sub 0.4}MnO{sub 3} cathode can be obtained at about 100 K lower operating temperature by using Sr-doped PrMnO{sub 3} as the cathode. The over potentials and electrical conductivity decreased and increased with increasing the amount of Sr dopant in PrMnO{sub 3}, respectively, and the lowest overpotential was attained at x = 0.4 in Pr{sub 1{minus}x}Sr{sub x}MnO{sub 3}. Comparing with La{sub 0.6}Sr{sub 0.4}MnO{sub 3} oxide, the reactivity of Pr{sub 0.6}Sr{sub 0.4}MnO{sub 3} with Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} is much less than that of La{sub 0.06}Sr{sub 0.4}MnO{sub 3} and furthermore, the matching of thermal expansion of Pr{sub 0.6}Sr{sub 0.4}MnO{sub 3} with Y{sub 2}O{sub 3}-ZrO{sub 2} was satisfactorily high. Therefore, perovskite oxide of Pr{sub 0.6}Sr{sub 0.4}MnO{sub 3} has a great possibility of the cathode materials for decreasing the operating temperature of solid oxide fuel cells.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 63192
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 142; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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