Abstract
Anode-supported solid oxide fuel cells (SOFCs), which were comprised of a Sr-doped LaMnO3 (LSM) + yttria-stabilized zirconia (YSZ) cathode active layer and a LSM cathode current collector layer, were fabricated. Electrochemical performance tests of the cells with and without chromia-forming alloy interconnect at 800 °C were conducted, under different cathode atmospheres (dry air or 10% humidified air) and current conditions (no current or 0.75 A/cm2). It was found that both humidity and cathodic current promote chromium (Cr) poisoning which has a detrimental effect on cathode performance. Major amounts of Cr-containing deposits were observed at the cathode/electrolyte interfaces of the cells tested with cathodic current and/or humidity. Based on the experimental results and free energy minimization calculations, a mechanism associated to Cr vapor species dissociation at the cathode/electrolyte interface is proposed.
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