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6 Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation Thermal treatment was shown to increase the capacitance of each fiber type significantly, as shown in (Figure 6.1). This increase was accompanied by a clear increase in kinetic performance, identified by reduced peak potential separation for each fiber type tested, (Figure 6.3). Figure 6.3: a) Characteristic CVs for thermally treated fibers, recorded at 100 mVs-1. b) peak separation at different sweep rates for thermally treated fibers, recorded in a 1 M KNO3 solution containing 1 mM K3Fe(CN)6 and 1 mM K4Fe(CN)6. From visual inspection of the recorded cyclic voltammetry presented in (Figure 6.3a) it is difficult to distinguish any difference in kinetic performance between the different felt types after thermal treatment. This is due to the much closer spread of peak potential separation between fibers, relative to the peak separations at non-activated fibers shown in (Figure 6.2b). However, it is not known whether the reduction in peak separation is due to larger inherent rate constants, or due to an increase of the electrochemically active surface area, as observed by the increased capacitance. Therefore, the apparent rate constant must be quantified before and after thermal treatment for each fiber. For this purpose, we use the numerical model detailed in Chapter 5, developed to calculate the rate constant at a cylindrical electrode from the peak potential separation and sweep rate. 81PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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