Insight into surface segregation and chromium deposition on La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes of solid oxide fuel cells
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La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) perovskite oxide is one of the most important cathode materials in the development of intermediate temperature solid oxide fuel cells (IT-SOFCs), but vulnerable to chromium deposition and poisoning in the presence of gaseous chromium species from the chromia-forming metallic interconnect. Despite extensive studies on Cr deposition on SOFC cathode materials, there is a lack of direct evidence on the surface chemistry and Cr deposition. Here, the fundamental relationship between the surface segregation and Cr deposition of LSCF cathodes is studied on dense LSCF bar samples using a dual beam high resolution focused ion beam (FIB) and a high resolution scanning electron microscope coupled with EDS. FIB-EDS mapping results clearly indicate the segregation of SrO and Co3O4 particles on the LSCF surface after annealing at 800 °C for 96 h. Cr deposition occurs preferentially on the segregated SrO but not on Co3O4. The fundamental reason for the selective and preferential Cr deposition on the segregated SrO is the exclusion effect of the presence of SrO on the reactivity between gaseous Cr species and segregated Co3O4, inhibiting the Cr deposition on the segregated Co3O4 particles.
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Effect of boron deposition and poisoning on the surface exchange properties of LSCF electrode materials of solid oxide fuel cellsZhao, L.; Hyodo, J.; Chen, Kongfa; Ai, Na; Amarasinghe, S.; Ishihara, T.; Jiang, San Ping (2013)The relationship between the surface segregation, boron poisoning and surface exchange coefficients of La0.6Sr0.4Co0.2Fe0.8O3−δ, (LSCF) cathodes of solid oxide fuel cells (SOFCs) is studied on dense bar samples using SEM, ...
Surface segregation and chromium deposition and poisoning on La 0.6Sr0.4Co0.2Fe0.8O 3-d cathodes of solid oxide fuel cellsZhao, L.; Drennan, J.; Kong, C.; Amarasinghe, S.; Jiang, San Ping (2013)La0.6Sr0.4Co0.2Fe0.8O 3-d, (LSCF) perovskite oxide is one of the most common cathode materials used in solid oxide fuel cells (IT-SOFCs), but vulnerable to the chromium deposition and poisoning in the presence of gaseous ...
Effect of temperature on the chromium deposition and poisoning of La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes of solid oxide fuel cellsWang, C.; Becker, Thomas; Chen, Kongfa; Zhao, Ling; Wei, Bo; Jiang, San Ping (2014)In this study, the effect of the temperature on the surface segregation and Cr deposition on La0.6Sr0.4Co0.2Fe0.8O3-ä(LSCF) cathodes is investigated using confocal laser Raman spectroscopy and electrical conductivity ...