Electrochemical Impedance Imaging on Conductive Surface
| dc.contributor.advisor | Shan, Xiaonan | |
| dc.contributor.committeeMember | Bao, Jiming | |
| dc.contributor.committeeMember | Mubeen, Syed | |
| dc.creator | Shi, Yaping | |
| dc.date.accessioned | 2022-06-17T21:25:38Z | |
| dc.date.created | December 2021 | |
| dc.date.issued | 2021-12 | |
| dc.date.submitted | December 2021 | |
| dc.date.updated | 2022-06-17T21:25:39Z | |
| dc.description.abstract | Electrochemical impedance spectroscopy (EIS) is a powerful tool to measure and quantify the system impedance. It allows to characterize the electrocatalytic and battery reactions. However, EIS only provides an average result from the entire electrode surface. Here, we demonstrated a reflection impedance microscope (RIM) which allows us to image and quantify the localized impedance on conductive surfaces. The RIM is based on the sensitive dependence between the materials’ optical properties, such as permittivity, and their local surface charge densities. According to the Drude model, the permittivity of metal surface is a function of charge density. Therefore, the localized charge density variations introduced by the impedance measurements will lead to the optical reflectivity changes on the electrode surfaces and can be captured with a cameras. Our experiments demonstrated that the reflectivity modulations are linearly proportional to the surface charge density on the electrode and the measurements show good agreement with the simple free electron gas model. The localized impedance distribution was successfully extracted from the reflectivity measurements together with the Randles equivalent circuit model. In addition, RIM is used to quantify the impedance on different conductive surfaces, such as indium tin oxide glass slide, fluorine-doped tin oxide glass slide, and stainless steel electrodes. A PDMS patterned electrode surface was used to demonstrate the impedance imaging capability of RIM. In the end, a single cell impedance imaging was obtained by RIM. | |
| dc.description.department | Electrical and Computer Engineering, Department of | |
| dc.format.digitalOrigin | born digital | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.citation | Portions of this document appear in: Shi, Yaping, Guangxia Feng, Xiaoliang Li, Xu Yang, Abdulsattar H. Ghanim, Paul Ruchhoeft, David Jackson, Syed Mubeen, and Xiaonan Shan. "Electrochemical Impedance Imaging on Conductive Surfaces." Analytical Chemistry (2021). | |
| dc.identifier.uri | https://hdl.handle.net/10657/9257 | |
| dc.language.iso | eng | |
| dc.rights | The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s). | |
| dc.subject | Electrochemical impedance | |
| dc.subject | imaging | |
| dc.title | Electrochemical Impedance Imaging on Conductive Surface | |
| dc.type.dcmi | Text | |
| dc.type.genre | Thesis | |
| dcterms.accessRights | The full text of this item is not available at this time because the student has placed this item under an embargo for a period of time. The Libraries are not authorized to provide a copy of this work during the embargo period. | |
| local.embargo.lift | 2023-12-01 | |
| local.embargo.terms | 2023-12-01 | |
| thesis.degree.college | Cullen College of Engineering | |
| thesis.degree.department | Electrical and Computer Engineering, Department of | |
| thesis.degree.discipline | Electrical Engineering | |
| thesis.degree.grantor | University of Houston | |
| thesis.degree.level | Masters | |
| thesis.degree.name | Master of Science in Electrical Engineering |
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