Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.800081
Title: New potential waveforms for cyclic and linear-sweep voltammetry
Author: Uchida, Yuki
ISNI:       0000 0004 8507 397X
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2020
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Abstract:
This thesis is concerned with the simulation of electrochemical systems in general and of voltammetry using various potential waveforms in particular. Chapter 1 introduces the fundamental principles of electrochemistry essential to the understanding of this thesis, and Chapter 2 outlines the methodology used in the numerical simulation of the systems of interest. Chapters 3 and 4 discuss the application and benefit of a non-triangular/nonlinear potential waveform to run cyclic voltammetry/potential-sweep voltammetry. In both chapters, a one-dimensional macroelectrode system is modelled for a one-electron electrochemically reversible reaction. Chapter 3 investigates the effect of cosine-based potential waves on the capacitive and Faradaic currents and proposes new opportunities to determine the formal potential of a redox couple based on the peak-to-peak separation in measured voltammograms. Chapter 4 extends the concept of a non-linear potential wave and studies the effect of a semi-circular potential wave on the current response for increased sensitivity of detection in electroanalysis. In both chapters, an experimental verification of the method are provided. Chapters 5 and 6 extend the semi-circular potential wave method to a twodimensional microelectrode system. Chapter 5 illustrates that the semi-circular potential wave method produces similar trends at a microelectrode as it does at a macroelectrode and shows the increased applicability of the method. Chapter 6 proposes a new method for determining the standard electrochemical rate constant through the application of a semi-circular potential wave at a microelectrode based on the voltammetric features. Chapter 7 applies the semi-circular potential waveform to stripping voltammetry for a one-electron electrochemically reversible reaction and shows how the unique voltammetric curves resulting from the semi-circular potential wave markedly increase the sensitivity.
Supervisor: Compton, Richard Guy Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.800081  DOI: Not available
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