UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

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 given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Liang, XuanSubject: search.filters.subject.Ambipolar

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    MODIFICATION OF MIXED PROTON-ELECTRON CONDUCTORS FOR HYDROGEN TRANSPORT MEMBRANES AND INVESTIGATION OF AMMONIA ION TRANSFER MEMBRANES
    (2015) Liang, Xuan; Wachsman, Eric; Chemical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    SrCe0.9Eu0.1O3- δ has low electron conductivity that limiting the hydrogen permeation. Effects of different dopants in SrCeO3 were studied in order to find new materials that have higher electron conductivity. Total conductivities of these materials and transference number of each species were used for calculating the electron and proton conductivities in the mixed ionic electronic conductors. SrCe0.9Pr0.1O3- δ was claimed to have higher electron conductivity than SrCe0.9Eu0.1O3- δ. The hydrogen permeability of SrCe1-xPrxO3- δ was studied as a function of temperature, hydrogen partial pressure gradient and water vapor pressure gradient. Modified Nafion® membranes can be used for electrochemical ammonia compression.