|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Energy Conversion with Emphasis on SOFC
||Chromium Impurity Effects on SOFC Cathodes Using Half-cell Measurements
||Yiwen Gong, Yuexing Zhu, Soumendra Basu, Uday Pal, Srikanth Gopalan
|On-Site Speaker (Planned)
High efficiency, negligible pollution and clean energy make solid oxide fuel cells(SOFCs) attractive for distributed generation. The lower operating temperature enables the deployment of metallic interconnects based on ferritic stainless steel, like Crofer 22 APU. However, the chromia oxide scale that forms on the surface of the Crofer 22 APU alloy will react with the oxygen and water vapor to form volatile chromium species which will degrade the cathodes.
In order to understanding the mechanism of the chromium poisoning in SOFC, electrolyte-supported half-cells have been fabricated. These half-cells have been tested at different temperatures with different humidity levels in the air, with and without mechanically contacting the Crofer 22 APU alloy. Galvanostatic current interruption (GCI) has been employed during the electrochemical test and after the test, scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX) have been used to measure the composition near the TBPs.
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