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7 Thermal Activation of Carbon Felt for the Positive Vanadium Redox Couple Conclusions Using our previously validated model for modelling cyclic voltammetry at carbon felts with specific void size distributions, we were able to calculate the mean apparent rate constant for three different felts (C100, GFE, G100), thermally treated in air for 1 hour at temperatures between 200 and 700 oC. Cyclic voltammetry showed significant differences in peak separation, in particular between the untreated felts. The difference in rate constants for the untreatedfeltsrangefromπ0 =8.31Γ10β7cms-1forG100,π0 =7.5Γ10β6cms-1 for πππ πππ GFE and π0 = 2.31 Γ 10β5 cm s-1 for C100. The largest mean apparent rate constant πππ measured was for GFE felt treated at 600 oC, with π0 = 8.52 Γ 10β5 cm s-1. Increased electrically active surface area likely explains the increased apparent rate constant for GFE. However, the increase in rate constant for G100 was significantly larger than the increase in electrically active surface. Therefore, thermal treatment likely introduced oxygen containing functional groups on the G100 surface, increasing the inherent rate constant. 106PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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