Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"redox mediator"”.
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Energy Level Alignment in Hybrid Bulk Heterojunctions and New Redox Mediators for Quantum Dot Solar Cells
… light absorbing quantum dots, TiO2, and a redox mediator. Kinetically, reduction of oxidized quantum dots by the redox mediator should be rapid and faster than the back electron transfer between TiO2 and oxidized quantum dots to maintain photocurrent. Thermodynamically, the reduction …
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Scanning electrochemical microscopy for the investigation of biosensors /
… were electrochemically investigated in a double redox mediator system with varying lipophilic mediators and optimal parameters were found. The yeast cells were later modified with a conductive polymer - polypyrrole and multi walled carbon nanotubes for evaluating changes in the charge transfer. …
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Organic macromolecular architectures for non-aqueous redox flow batteries
… of polymers and polymer architectures to create redox active materials. Here we attempt to produce an all-organic polymer battery in solution state using inexpensive Celgard separators to compete with experiencing large crossover. Our first example of such a material utilized viologen pendant …
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Bioremediation of petroleum hydrocarbons using microbial fuel cells
… parameters - external resistance, salinity and redox mediator were also investigated using response surface methodology. The outcomes of this study demonstrated the robustness of MFCs with good degradation performance (range 80 - 98 %) and maximum power production up to 10 mWm-2 obtained at …
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Scanning electrochemical microscopy with conducting polymer probes: Validation and applications
… (SECM) is a useful technique for exploring redox and ionic processes on active materials. Here we explore how conducting polymers (CPs) offer several advantages as probe electrode material, given its versatility in the measurement of redox and ionic processes, resulting in a probe that can …
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Electrochemically mediated separations and catalysis
… peroxide streams. This was achieved by employing redox mediator phase-transfer (RMPT) to produce and isolate aqueous H₂O from the electrolysis of H₂O and O2 where the quinone mediator was 'trapped' in an organic phase. Conversely, the mediator was trapped in a solid-state electrode, and exposed to …
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Tracking the Function and Failure of Li-Air Electrolytes using Electrochemical and Spectroscopic Methods
… overpotentials is through the introduction of a redox mediator (RM), a soluble catalyst that facilitates the solution-based growth of discharge product and thereby extends the battery life. The kinetics of the electron transfer reaction of the RM with the target species (O2 on discharge and Li2O2 …
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Development of an EQCM-based sensor for metal ions
… the polymer layer will also contain a redox mediator, methylene blue (MB), to facilitate electrochemical conditioning of the analyte. The following results have been obtained from EQCM and microelectrode voltammetry studies of each of the component parts. The Gold Piezoelectrode - The …
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Redox Flow Iontophoresis for Brain Cancer Therapy
… I present the results of my PhD research on redox flow iontophoresis, a new approach that I have developed based on the continuous flow of a redox mediator solution to facilitate charge transfer in iontophoretic devices. Redox flow iontophoresis addresses long standing issues of iontophoresis …
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Kinetics of phase transformations in lithium-sulfur batteries
… study of exchange current density for redox of higher order polysulfide solutions and their ionic conductivity has been conducted. The type and amount of electrolyte solvent has been found to influence both of these. The second portion of this thesis characterizes the kinetics of Li₂S …
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Ligand participation in energy storage electrocatalysis and photocatalysis
… serves as the photosensitizer and as a redox mediator in what is determined to be a tandem cycle. TA also demonstrates the role of halogen-arene charge transfer intermediates in increasing the quantum yield of halogen photoelimination by Ni(III) trichloride complexes containing bidendate …
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Towards comprehensive design of electrolytes for electrochemical energy storage
… devices. The electrolyte can also interact with redox reactions occurring at the electrodes, altering their thermodynamics and kinetics. Therefore, understanding how to control the properties of the electrolyte is vital for the development of next generation electrochemical storage devices. In …
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Towards unravelling the mechanism and function of exoelectrogenesis in cyanobacteria
… a workflow for identifying the endogenous redox mediator, developing a platform for *in operando* electrochemistry and microscopy, and using it to study the dynamic spatial variations in biofilm behaviour during exoelectrogenesis. First, the question of the mechanism of exoelectrogenesis is …
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Enhancing the oxidation of Li₂O₂ in Li-O₂ batteries : mechanistic and chemical efficacy probing
… metal complex (Co(Terp)2) is demonstrated as redox mediator of the electron transfer to the insulating Li₂O₂. However, chemical probing using DEMS revealed a parasitic Co II to Co l reduction during discharge using the metal complex while the ideal 2.0 e-/O₂ formation of Li₂O₂ is observed with …
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Mechanistic Electrochemistry: Investigations of Electrocatalytic Mechanisms for H2S Detection Applications
… an electrocatalytic (EC') mechanism by using a redox mediator to facilitate the reaction with sulphide in aqueous solutions. In order to support the analysis of FTACV, other electrochemical analytical techniques, cyclic voltammetry (CV) and linear sweep voltammetry (LSV), were also employed to …
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Proton-coupled electron transfer reactions in bio-inspired catalysis
… active while the adjacent metal center is redox active, and (2) the importance of considering thermodynamically less stable but active intermediates. Nature also often relies on mediators to couple electrons and protons between various cycles in catalysis. A prime example of the importance …
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Characterizing mass transport and crossover reactions in Li-air batteries
… Similar to fuel cells, mass transport of redox active species, such as dissolved oxygen gas or redox mediators, is one of the challenges faced by LABs. While increasing mass transport increases LAB cell performance, it can also increase crossover of the redox active species from one …
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Multi-component protein films by layer-by-layer : assembly and electron transfer
… optimisation of signal transfer in these natural redox chains has inspired engineering of artificial architectures mimicking essential properties of their natural analogues. Implementation of direct electron transfer (DET) in protein assemblies was a breakthrough in bioelectronics, providing a …
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Enhanced large-scale production of laccases from Coriolopsis polyzona for use in dye bioremediation
… by Lac I compared to azo dyes. The addition of redox mediator ABTS and violuric acid (VA) improved considerably the catalytic efficiencies of azo dyes. Decolourisation, 40-50 %, was achieved for the reactive and the direct dye baths. Response surface technology (RSM) was applied to optimise the …
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