Fabrication and Performance Prediction of Graphene Microsupercapacitor Devices for Future Energy Storage Applications

dc.contributor.advisorAhn, Ethan
dc.contributor.authorCarley, Christopher Scott
dc.contributor.committeeMemberGuo, Ruyan
dc.contributor.committeeMemberBhalla, Amar
dc.creator.orcidhttps://orcid.org/0000-0002-6705-7031
dc.date.accessioned2024-02-09T19:29:13Z
dc.date.available2024-02-09T19:29:13Z
dc.date.issued2021
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractThe state of our environment has necessitated a rapid increase in demand for renewable energy sources like solar, wind, etc. Unfortunately, these commonly available renewable energy sources have an implicitly intermittent nature of energy generation. Therefore, there is a need for fast charging high-capacity energy storage devices that can complement energy harvesting technologies. Compared to lithium-ion batteries and hydrogen fuel cells, supercapacitors exhibit superior power density (W/kg), enabling fast charging/discharging cycles, long life cycles, and a robust thermal operating range. However, supercapacitors have relatively low energy density (Wh/kg), which remains a significant challenge. This research presents a low-cost fabrication technique to produce all solid-state, flexible, and high-performance microsupercapacitor devices. The microsupercapacitors use solution-processable reduced graphene oxide (rGO) as their active material in an interdigitated electrode structure. Additionally, the experimental research efforts were guided by predictive power density and energy density performance models and simulations. Preliminary testing of the graphene microsupercapacitor devices proves the effectiveness of the newly outlined experimental procedure while investigating them as the next-generation high-performance energy storage device. Results indicate successful reduction from GO to rGO through Raman spectroscopy measuring a high D band to G band intensity ratio (ID/IG) of 1.65 and sheet resistance of 5.681 x 107 Ω/□. Additionally, the H3PO4/PVA gel electrolyte's relative permittivity was large, measuring around 9,000, the devices produced a capacitance in the nF range, low capacitance loss during flexing from 0-4%, and models predict devices exhibiting up to around a 30,000 W/kg power density and 8.5 Wh/kg energy density.
dc.description.departmentElectrical and Computer Engineering
dc.format.extent76 pages
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/20.500.12588/2928
dc.languageen
dc.subjectEnergy Density
dc.subjectEnergy Storage
dc.subjectGraphene
dc.subjectPower Density
dc.subjectReduced Graphene Oxide
dc.subjectSupercapacitor
dc.subject.classificationMaterials Science
dc.titleFabrication and Performance Prediction of Graphene Microsupercapacitor Devices for Future Energy Storage Applications
dc.typeThesis
dc.type.dcmiText
dcterms.accessRightspq_closed
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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