Development and Fabrication of New Electrode Materials for Hybrid Battery / Supercapacitor Devices

Alshehri, Sarah (2022) Development and Fabrication of New Electrode Materials for Hybrid Battery / Supercapacitor Devices. Doctoral thesis, University of East Anglia.

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This thesis describes the electrochemical properties of active materials, such as N-pyrrolyle boranes and polyoxometalate-polypyrrole hybrids, and their application as electrodes for use in hybrid battery/supercapacitor devices. The thesis is divided into 7 chapters. The first chapter introduces the background to the research in this thesis. The second chapter describes all electrochemical techniques used throughout this research and all the experimental methods.

Chapter 3 describes development of hybrid battery/supercapacitors based on anthraquinone/lithium for use in hybrid-diffusional battery devices. The investigation was carried out by electrochemical methods including cyclic voltammetry, Electrochemical impedance spectroscopy (EIS), galvanostatic (charge-discharge technique) and electrochemical quartz crystal microbalance (EQCM).

Chapter 4 presents a study of the electropolymerisation of the N–pyrrolyl–bis(pentafluorophenyl) borane monomer and compares the resulting material (poly1) with the known conducting polymer poly(pyrrole) by using different electrochemical methods. It also compares polymers formed from other Lewis acidic N-pyrrole-boranes with N–pyrrolyl–bis(pentafluorophenyl) borane in terms of capacitance and stability.

Chapter 5 focuses on fabrication of a new supercapacitor/ hybrid battery which is made for the first time from anthraquinone as a negative electrode and poly1 as positive electrode. In addition, it describes the electrochemical behaviors of supercapacitor/hybrid battery of AQ-poly1 using different electrochemical techniques including cyclic voltammetry, electrochemical impedance spectroscopy (EIS), electrochemical quartz crystal microbalance (EQCM), and charge-discharge techniques. Also, measurement of specific capacitance and stability were done in this chapter by different methods, including cyclic voltammetry and galvanostatic (charge-discharge) methods. Finally, after studying the electrochemical behaviors of the new hybrid battery/ supercapacitor, we applied devices of the new hybrid battery/supercapacitor successfully.

Chapter 6 describes the investigation of hybrid polyoxometalate-polypyrrole films in which the polyoxometalates are covalently linked to the pyrrole monomers. These were electrosynthesised on the surface of both glassy carbon electrodes and FTO glass. X-ray photoelectron spectroscopy (XPS) and energy- dispersive x-ray (EDX)elemental analyses were done which indicate that polyoxometalate loading is higher than in conventional noncovalent inclusion films. Also, the covalent attachment can prevent loss of polyoxometalates on initial reduction cycles. In this work, we applied different electrochemical methods including cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge measurements.

Chapter 7 is the conclusion of the work and future research suggestions. Also, appendices including list of publications, presentations, and posters that presented at conferences. Finally, awards gained during the PhD are presented.

Item Type: Thesis (Doctoral)
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Chris White
Date Deposited: 23 Jan 2023 08:54
Last Modified: 23 Jan 2023 08:54

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