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1 Introduction Chapter 5 - Single Fibre Electrode Measurements - a Versatile Strategy for Assessing the Non-Uniform Kinetics at Carbon Felt Electrodes The electrochemical performance of carbon felts is commonly tested by calculating the energy efficiency for charge / discharge cycles of electrochemical cells. This method whilst useful does not provide a direct measure for the kinetics of the redox reactions at the electrode surface. This work demonstrated that the kinetics of carbon felts can be directly measured using experimental cyclic voltammetry and simulations of individual carbon fibers and carbon felt. Chapter 6 - Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation The electrochemical performance of four different carbon fiber types for the Fe(CN) 3− / 6 Fe(CN) 4− redox couple before and after thermal activation is quantified. With calculations 6 carried out using analysis of cyclic voltammetry discussed in Chapter 5 and the EIS modelling of cylindrical microelectrodes described in Chapter 4. Chapter 7 – Thermal Activation of carbon Felt for the Positive Vanadium Redox Couple The electrochemical performance of three different thermally treated carbon felts towards the positive VRFB redox couple (VO2+ / VO2+) was investigated, using the previously developed analytical methods described in Chapter 5. Thermal treatment improved the performance of all felts, likely due to increases in the electrically active surface area from increased surface roughness and improved wettability. Chapter 8 – Half-Cell Performance of Carbon Felt Samples Kinetic measurements of carbon felts from cyclic voltammetry in stagnant solutions were validated using half-cell measurements with pumped electrolyte. The results were consistent, as the felts that were found to have higher rate constants from cyclic voltammetry also had higher rate constants as measured from polarization curve analysis. Additionally, the felts with higher rate constants had higher efficiencies during charge / discharge measurements. 11PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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