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8 Half – cell performance of Carbon Felt Samples Conclusions Polarization curve and charge / discharge cycling measurements for a range of untreated and thermally treated felts were recorded in a half-cell set up. It was found that at low current densities, the apparent rate constant for felt samples could be accurately recorded. The apparent rate constants calculated from polarization curve measurements were in close agreement to those calculated previously from cyclic voltammetry for GFE and C100 felts. The apparent rate constants calculated for G100 felt samples from polarization curve measurements were significantly higher than what was calculated from cyclic voltammetry. This discrepancy is likely due to improved wetting in the half-cell. Charge / discharge cycling measurements were carried out to calculate the voltage, coulombic and energy efficiency for the positive VRFB reaction. The resulting energy efficiency values were consistent with the apparent rate constant values calculated from polarization curve measurements. With the GFE felt thermally treated at 600 oC having the highest rate constant of 𝑘0 = 4.3 x 10−5 cm s-1 and an energy efficiency 𝑎𝑝𝑝 of 87.7% for charge / discharge curve measurements recorded at 100 mA cm-2. 122PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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