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7 Thermal Activation of Carbon Felt for the Positive Vanadium Redox Couple The mean apparent rate constants for each felt and treatment procedure was then calculated, assuming the same pore size distribution as the GFE felt, defined in Chapter 5. It is likely that the C100 and G100 felts have a slightly different pore size distribution, however this is not expected to make a significant difference as previously mentioned all three felts have very similar porosity, (Figure 7.5). Figure 7.5: Mean apparent rate constant for the different treated and untreated felt samples. As expected the GFE and C100 felts typically had much higher rate constants than the G100 felt. For the untreated felts G100 𝑘0 = 8.31 × 10−7 cm s-1, GFE 𝑘0 = 7.5 × 10−6 cm s-1 and C100 𝑘0 = 2.31 × 10−5 cm s-1. The largest mean apparent rate constant measured was for GFE felt treated at 600 oC, with 𝑘0 = 8.52 × 10−5 cm s-1. These values are in close agreement with rate constant values stated in literature, Bourke et al. reported a rate constant of 1.83 × 10−5 cm s-1 at carbon felt for the same reaction, whilst Stimming et al reported 3.8 ± .6 × 10−6 cm s-1 for the same reaction at a carbon nanotube electrode [88, 125]. 103PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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