Promises and problems with metallic interconnects for reduced temperature solid211 oxide fuel cells

摘要

The oxidation kinetics and electrical properties of oxide scales thermally grown211u001eon the surface of a commercial iron-based alloy have been investigated up to 1000 211u001edeg C. The effect of surface coating to improve performance was studied, and it 211u001ewas found that a double coating of Y and Ni oxide was most beneficial. While the 211u001eY oxide reduced the oxidation rate, the Ni oxide increased the Cr2O3 scale 211u001econductivity. Different electrodes were applied to the alloy or to pre-oxidized 211u001esamples. Some of the electrodes, such as LaSrCoO3 (LSCo), reacted strongly with 211u001ethe alloy upon oxidation by increasing the oxidation rate and forming a mixed 211u001eFe/Co/Cr interlayer that impeded conduction. Application of these electrodes to a 211u001epre-oxidized surface eliminated these problems.