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Microwave synthesis of lithium cobalt oxide & iron-doped lithium cobalt oxide for oxygen evolution reaction
Descriptive
TitleInfo
Title
Microwave synthesis of lithium cobalt oxide & iron-doped lithium cobalt oxide for oxygen evolution reaction
Name
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NamePart
(type = family)
Li
NamePart
(type = given)
Bowei
NamePart
(type = date)
1992-
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Bowei Li
Role
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(authority = RULIB)
author
Name
(type = personal)
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Galoppini
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Elena
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Elena Galoppini
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Advisory Committee
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chair
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Lalancette
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Roger
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Roger Lalancette
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Advisory Committee
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internal member
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(type = personal)
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(type = family)
Lockard
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Jenny
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Jenny Lockard
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Advisory Committee
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internal member
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(type = family)
He
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Huixin
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Huixin He
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Advisory Committee
Role
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internal member
Name
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NamePart
Rutgers University
Role
RoleTerm
(authority = RULIB)
degree grantor
Name
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NamePart
Graduate School - Newark
Role
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school
TypeOfResource
Text
Genre
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theses
OriginInfo
DateCreated
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2018
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(type = degree)
2018-05
CopyrightDate
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2018
Place
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(type = code)
xx
Language
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(type = code)
eng
Abstract
(type = abstract)
Oxygen 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.
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.
Subject
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Topic
Chemistry
Subject
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Topic
Radiation chemistry
RelatedItem
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TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
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ETD
Identifier
ETD_8885
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (46 pages) : illustrations
Note
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M.S.
Note
(type = bibliography)
Includes bibliographical references
Note
(type = statement of responsibility)
by Bowei Li
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TitleInfo
Title
Graduate School - Newark Electronic Theses and Dissertations
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rucore10002600001
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NjNbRU
Identifier
(type = doi)
doi:10.7282/t3-x8rf-hj24
Genre
(authority = ExL-Esploro)
ETD graduate
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Rights
RightsDeclaration
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The author owns the copyright to this work.
RightsHolder
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Name
FamilyName
LI
GivenName
BOWEI
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
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2018-04-13 12:13:14
AssociatedEntity
Name
BOWEI LI
Role
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Affiliation
Rutgers University. Graduate School - Newark
AssociatedObject
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License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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