Abstract
The system of chromia-forming alloy/Sr-doped LaMnO 3 (LSM) electrode/3 mol%Y 2O 3–ZrO 2 (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 ( R E) 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 O 2 reduction at an early stage of polarization.
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