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dc.contributor.advisorMeyers, Jeremy P.en
dc.contributor.advisorChen, Dongmei, Ph. D.en
dc.creatorMichael, Philip Henryen
dc.date.accessioned2012-11-06T14:48:07Zen
dc.date.available2012-11-06T14:48:07Zen
dc.date.issued2012-08en
dc.date.submittedAugust 2012en
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2012-08-6261en
dc.descriptiontexten
dc.description.abstractWith its long cycle life and scalable design, the vanadium redox flow battery (VRB) is a promising technology for grid energy storage. However, high materials costs have impeded its commercialization. An essential but costly component of the VRB is the ion-exchange membrane. The ideal VRB membrane provides a highly conductive path for protons, prevents crossover of reactive species, and is tolerant of the acidic and oxidizing chemical environment of the cell. In order to study membrane performance and optimize cell design, mathematical models of the separator membrane have been developed. Where previous VRB membrane models considered minimal details of membrane transport, generally focusing on conductivity or self-discharge at zero current, the model presented here considers coupled interactions between each of the major species by way of rigorous material balances and concentrated solution theory. The model describes uptake and transport of sulfuric acid, water, and vanadium ions in Nafion membranes, focusing on operation at high current density. Governing equations for membrane transport are solved in finite difference form using the Newton-Raphson method. Model capabilities were explored, leading to predictions of Ohmic losses, vanadium crossover, and electro-osmotic drag. Experimental methods were presented for validating the model and for further improving estimates of uptake parameters and transport coefficients.en
dc.format.mimetypeapplication/pdfen
dc.language.isoengen
dc.subjectConcentrated-solution theoryen
dc.subjectRedox flow batteriesen
dc.subjectVanadium redox flow batteryen
dc.subjectCation-exchange membranesen
dc.subjectComputational modelingen
dc.subjectElectrical energy storageen
dc.titleA multicomponent membrane model for the vanadium redox flow batteryen
dc.date.updated2012-11-06T14:48:19Zen
dc.identifier.slug2152/ETD-UT-2012-08-6261en
dc.description.departmentMechanical Engineeringen
dc.type.genrethesisen
thesis.degree.departmentMechanical Engineeringen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorUniversity of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Science in Engineeringen


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