Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

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Author: search.filters.author.MacBride, Jonathon KaineSubject: search.filters.subject.Bismuth Oxide

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    First Principles Computation Study and Design of δ-Bi2O3 Oxygen Ionic Conductors
    (2016) MacBride, Jonathon Kaine; Mo, Yifei; Material Science and Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The high operating temperatures in solid oxide fuel cells (SOFC) result in high cost, reduced longevity, and decreased efficiency impeding the wide application of this technology. Lowering the temperature of SOFC requires electrolytes with high ionic conductivity at lower temperatures. Stabilized δ-Bi2O3 electrolytes have high oxygen ionic conductivity, but its activation energy of ionic conduction increases below ~600°C due to the anion lattice ordering. We performed first principles computation to study this order-disorder transition in various dopant stabilized δ-Bi2O3 electrolytes. Using first principles computation, we predicted alternative dopants to lower the transition temperature of this material for future applications in SOFCs.