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Microwave synthesis of lithium cobalt oxide & iron-doped lithium cobalt oxide for oxygen evolution reaction
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Li, Bowei. Microwave synthesis of lithium cobalt oxide & iron-doped lithium cobalt oxide for oxygen evolution reaction. Retrieved from https://doi.org/doi:10.7282/t3-x8rf-hj24

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TitleMicrowave synthesis of lithium cobalt oxide & iron-doped lithium cobalt oxide for oxygen evolution reaction
NameLi, Bowei (author); Galoppini, Elena (chair); Lalancette, Roger (internal member); Lockard, Jenny (internal member); He, Huixin (internal member); Rutgers University; Graduate School - Newark
Date Created2018
Other Date2018-05 (degree)
SubjectChemistry, Radiation chemistry
Extent1 online resource (46 pages) : illustrations
DescriptionOxygen evolution reaction (OER) plays a critical role in many advanced technologies for obtaining sustainable and clean energy, such as water splitting and CO2 reduction. However, current industry used precious metal-based OER catalysts (i.e. Ir, Ru) suffers from problems of low abundance and instability under high anodic potentials, which keeps these technologies far from large-scale applications. Recently, lithium cobalt oxide (LiCoO2) has been found as one of highly active and stable catalysts in OER, shows a potential to replace the precious metal. However, the most common used methods to synthesize LiCoO2 are based on traditional solid-state annealing, which has drawbacks in time/energy consuming and uncontrollable morphology. In this thesis, we developed a fast, simple, and cost-effective method to synthesize LiCoO2 taking advantage of the unique fast heating via microwave irradiation.
Chapter 1 includes a brief overview on oxygen evolution reaction and OER catalysts. The microwave heating mechanism will also be introduced.
In chapter 2, we designed a fast and pretreatment-free microwave-assisted method to synthesize LiCoO2 with small particle sizes. We found that the microwave process influences the crystal structures and the amount of Co3O4 impurities in the fabricated LiCoO2 particles. An optimal microwave irradiation process was established to eliminate all the Co3O4 impurities. The as-synthesized LiCoO2 with different structures as an electrochemical catalyst for oxygen evolution reaction in a water splitting setup to generate hydrogen was tested. The existence of Co3O4 impurities in the fabricated LiCoO2 particles negatively impacts on their OER performance. The LiCoO2 particles with minimal Co3O4 impurities exhibited a comparable performance with an overpotential of 430mV at 10mA/cm2 as those fabricated by previous reported approaches.
In chapter 3, using the microwave irradiation method developed in chapter 2, we successfully doped Fe into the LiCoO2 frameworks. OER performance showed an obvious increase upon Fe doping. LiCoO2 with 20% Fe exhibited the best OER activity with an overpotential (η) of 370mV at 10mA/cm2, which deceased 60 mV compared to that of the undoped LiCoO2. Characterization of these Fe doped LiCoO2 via X-ray photoemission spectroscopy (XPS) demonstrated the electronic interaction between Fe and Co, which pushed the Co to a higher oxidation state of Co4+ from Co3+ in the undoped LiCoO2.
NoteM.S.
NoteIncludes bibliographical references
Noteby Bowei Li
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/t3-x8rf-hj24
Languageeng
CollectionGraduate School - Newark Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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