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6 Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation As demonstrated earlier, thermal treatment led to reduced peak separations during cyclic voltammertry for all four of the fiber types. To quantify the changes in the kinetic performance, the apparent rate constant was calculated using the previously discussed numerical model, with the mean values are presented in (Figure 6.4). Figure 6.4: Calculated apparent rate constant at different sweep rates for thermally treated carbon fibers in a 1 M KNO3 solution containing 1 mM K3Fe(CN)6 and 1 mM K4Fe(CN)6. The apparent rate constants calculated using the peak separation are smaller at the slower sweep rates, approaching an asymptote at 1000 mV s-1. At faster sweep rates, the uncertainty associated with identifying the peak potential is reduced. The increased uncertainty at low sweep rates is compounded when the peak separation is relatively small, (Figure 6.5). Figure 6.5: Peak separation dependence on apparent rate constant for a 10μm diameter fiber, specific values from CVs modelled at a sweep rate of 200 mVs-1. 83PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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