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Detailed chemical and structural analyses are presented for the degradation mechanism of La0.8Sr0.2CoO3 [La subscript 0.8 Sr subscript 0.2 CoO subscript 3]] (LSC) as the contactlayer of solid oxide electrolysis cell (SOEC) anodes. SOEC stack cells, which were operated in the presence of Cr-containinginterconnects, and reference half-cells, which were tested with Pt interconnects, were investigated. The as-prepared surfacechemistry of LSC showed a spatially uniform A-site (La and Sr) enrichment. Undesirable secondary phases of Cr2O3 [Cr subscript 2 O subscript 3], LaCrO3 [LaCrO subscript 3],La2CrO6 [La subscript 2 CrO subscript 6], and Co3O4 [Co subscript 3 O subscript 4] were identified in the contact layer of the SOEC stack cells, which had significantly reduced electrochemicalperformance after long-term testing. Auger electron spectroscopy and analytical transmission electron microscopy showed thepresence of Cr throughout the layer cross section on the surface and in the bulk, respectively, with significant variations in the localchemistry at the micro- to nanoscale. Particularly, a long-range transport of Sr and Co cations out of the LSC phase to the top ofthe contact layer was evident. However, when tested with electrolytic potential and current without a Cr environment, the LSCcontact layer composition remained stable. The dissociation of the LSC in the SOEC stack cells can be, most probably, driven bythe La–Cr–O related thermodynamics under the electrolytic potential and oxygen pressure at the anode.United States. Dept. of Energy. Office of Nuclear Energ

Degradation Mechanism in La[sub 0.8]Sr[sub 0.2]CoO[sub 3] as Contact Layer on the Solid Oxide Electrolysis Cell Anode