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6 Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation Using the model numerical was proven, the apparent rate constant for each tested fiber was calculated, using the peak separations displayed in Figure 6.2. The mean value and uncertainty for each fiber type was then calculated and is summarized in (Table 6.3). Table 6.3: Mean apparent rate constant for each as-received fiber type, calculated from CVs recorded at 200 mV s-1. Fiber Type GFE C100 G100 Toray Rate Constant (cm s-1) 4 x 10-3 ± 3 x 10-3 3 x 10-3 ± 2 x 10-3 3 x 10-6 ± 4 x 10-7 < 2 x 10-7 As expected GFE had the largest apparent rate constant, closely followed by C100. The apparent rate constants for GFE and C100 are three orders of magnitude larger than for G100 and at least four orders of magnitude larger than for Toray. This variation is significant and larger than expected, based on the modest expected differences in electrochemically active surface area observed from capacitance measurements. This shows that there are significant differences in the performance of the different fiber surfaces, with larger inherent rate constant values at GFE and C100 fibers, probably due to functional groups at the surface. 82PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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