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6 Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation Results and Discussion Cyclic voltammetry at microcylinders depends on the radius of the electrode, therefore the mean diameter of the four fiber samples calculated from SEM images, Table 6.1. Table 6.1: Mean diameters calculated from 15 different fibers for each of the four fiber types. Felt Sample C100 Toray G100 GFE Diameter (μm) 8.2 ± 0.2 8.2 ± 0.2 8.7 ± 0.2 10.0 ± 0.2 The specific capacitance was calculated for individual fibers using the current at 0.4 V vs Ag|AgCl from CVs recorded at 50 mVs-1. The fiber area was calculated by assuming each fiber was a perfect cylinder, with the mean diameters given in Table 6.1. The mean capacitance and related uncertainties for each fiber type was then calculated, with clear differences between the different fibers and a noticeable increase after thermal treatment, (Figure 6.1). Figure 6.1: Capacitance of each felt type recorded before and after thermal treatment, recorded in 0.5 M H2SO4 at a sweep rate of 50 mVs-1. 78PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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