Deposition of chromium species on Sr-doped LaMnO3 cathodes in solid oxide fuel cells |
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| Institution: | 1. CSIRO, Manufacturing Science and Technology, Private Bag 33, Clayton South MDC, Vic. 3169, Australia;2. Ceramic Fuel Cell Limited, 170 Browns Road, Noble Park, Vic. 3174, Australia;1. Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany;2. Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, 04736 Waldheim, Germany;3. Faculty of Chemistry and Food Chemistry, Dresden University of Technology, 01062 Dresden, Germany |
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| Abstract: | The system of chromia-forming alloy/Sr-doped LaMnO3 (LSM) electrode/3 mol%Y2O3–ZrO2 (TZ3Y) electrolyte has been investigated at 900°C in air under cathodic polarization conditions. Deposition of chromium species was found to occur preferentially at the TZ3Y electrolyte surface, forming a deposit ring around the edge of the LSM electrode coating. The width of the ring was about 60 μm for an LSM electrode polarized for about 50 h. Overpotential (η) increases with polarization time. In contrast to η, electrode interface resistance (RE) measured under open circuit conditions decreases initially after passing the current and remains almost constant with polarization. The results indicate that the deposition process of chromium species may not be dominated by electrochemical reduction processes in competition with O2 reduction at an early stage of polarization. |
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