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DURABILITY AND OPTIMIZATION OF SOFC COMPOSITE CATHODES

dc.contributor.advisorWachsman, Eric Den_US
dc.contributor.authorPainter, Albert Stevenen_US
dc.date.accessioned2017-01-25T06:41:36Z
dc.date.available2017-01-25T06:41:36Z
dc.date.issued2016en_US
dc.identifierhttps://doi.org/10.13016/M2JV9N
dc.identifier.urihttp://hdl.handle.net/1903/19102
dc.description.abstractThe combination of the conventional cathode material, La0.8Sr0.2MnO3-𝛿 (LSM), and exceptional oxygen ion conducting material, (Er0.2Bi0.8)2O3 (ESB), has shown promise as a potential candidate for low temperature solid oxide fuel cell (LT-SOFC) cathodes. Though the initial performance of this composite is encouraging, the long-term stability of LSM-ESB has yet to be investigated. Here electrochemical impedance spectroscopy (EIS) was used to in situ monitor the durability of LSM-ESB at typical LT-SOFC operation temperatures. The degradation rate as a function of aging time was extracted based on the EIS data. Post analysis suggests that below 600 °C the order-disorder transition of ESB limits the performance due to a decrease in the oxygen incorporation rate. Above 600°C, the formation of secondary phases, identified as Mn-Bi-O, is the major performance degradation mechanism. Furthermore, the relative particle size of the LSM to ESB was optimized to minimize long-term degradation in cathode performance.en_US
dc.language.isoenen_US
dc.titleDURABILITY AND OPTIMIZATION OF SOFC COMPOSITE CATHODESen_US
dc.typeThesisen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentMaterial Science and Engineeringen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pquncontrolledBismuth Oxideen_US
dc.subject.pquncontrolledDurabilityen_US
dc.subject.pquncontrolledSOFCen_US


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