Structure-Property Relationships in Mixed-Metal Oxides and (Oxy)Hydroxides for Energy Applications

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dc.contributor.advisorPage, Catherine
dc.contributor.authorEnman, Lisa
dc.date.accessioned2019-01-11T23:21:20Z
dc.date.issued2019-01-11
dc.description.abstractMetal oxides and (oxy)hydroxides, particularly those containing two or more metals have many uses as electronic materials and catalyst, especially in energy applications. In this dissertation, the structure-property relationships of these mixed-metal materials are explored in order to understand how these materials work and to guide design of materials with even higher efficiency for a given application. Chapter I introduces the materials and studies undertaken. Chapter II presents a fundamental analysis of the electronic and local atomic properties of mixed-transition-metal aluminum oxide thin films. The final three chapters focus on water electrolysis for hydrogen production, which is limited in part by the slow kinetics of the oxygen evolution reaction (OER). Nickel-iron and cobalt-iron (oxy)hydroxides have been shown to be the most active in alkaline conditions. Although it is evident that Fe is essential for high activity, its role is still unclear. Chapter III investigates the role of Fe in NiOOH by comparing the effects of Ti, Mn, La, and Ce incorporation on the OER activity of NiOOH in base. Chapter IV evaluates the OER activity and Tafel behavior of Fe3+ impurities on different noble metal substrates. Chapter V describes the results of in situ and in operando X-ray spectroscopy experiments, which shows that the local structure around Fe atoms in Co(Fe)OOH changes during OER while that of Co stays the same. This work adds to the growing body of literature that suggests Fe is essential to the catalytic active site for the OER on transition-metal (oxy)hydroxides. This dissertation contains previously published and un-published coauthored material.en_US
dc.description.embargo2020-01-11
dc.identifier.urihttps://hdl.handle.net/1794/24227
dc.language.isoen_US
dc.publisherUniversity of Oregon
dc.rightsAll Rights Reserved.
dc.subjectElectrocatalysisen_US
dc.subjectElectrochemistryen_US
dc.subjectOxygen evolutionen_US
dc.subjectThin filmsen_US
dc.subjectWater electrolysisen_US
dc.subjectX-ray absorption spectroscopyen_US
dc.titleStructure-Property Relationships in Mixed-Metal Oxides and (Oxy)Hydroxides for Energy Applications
dc.typeElectronic Thesis or Dissertation
thesis.degree.disciplineDepartment of Chemistry and Biochemistry
thesis.degree.grantorUniversity of Oregon
thesis.degree.leveldoctoral
thesis.degree.namePh.D.

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