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7 Thermal Activation of Carbon Felt for the Positive Vanadium Redox Couple As with capacitance and physical area, the mean apparent rate constants of the thermally treated carbon felts generally increased with thermal treatment, (Table 7.3). Table 7.3:Change in mean apparent rate constant for each felt treatment. Treatment oC 200 300 400 500 600 700 G100 Factor Increase 0.3 x 1.3 x 3.8 x 6.3 x 7.6 x - GFE Factor Increase 0.95 x 1.48 x 2.28 x 8.90 x 11.35 x 3.77 x C100 Factor Increase 1.27 x 1.24 x - - - - The increase in the apparent rate constant for GFE from thermal treatment at 600 oC by a factor of 11.35, is only slightly larger than the increase in capacitance of 7.5 x, but smaller than the increase in physical area of 19.3 x. Therefore, there is no clear evidence to suggest the thermal treatment changed the inherent rate constant of the GFE carbon felt, but the increased surface area clearly increased the apparent rate constant. 104PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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