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8 Half – cell performance of Carbon Felt Samples Results and Discussion The electrolyte flowrate is an important parameter for the cell efficiency and power output, as a higher flowrate reduces the mass transport overpotential. In this work the polarization curve was recorded at a range of flowrates with a GFE felt thermally treated at 300 oC for one hour as the working electrode, (Figure 8.2). Figure 8.2: a) Polarization curve for different electrolyte flow rates through the felt. b) Apparent rate constant calculated form the electrode overpotential. In Figure 8.2 a, the polarization curve data demonstrates that increasing the flowrate reduces the required overpotential for each current density. Additionally, the overpotential increases significantly after around 150 mA cm-2, particularly at the lower flowrates and is likely the result of mass transfer resistance. The apparent rate constants calculated form the overpotentials are shown in Figure 8.2 b, as expected the calculated apparent rate constants decrease above 150 mA cm-2. This is not because the rate constant has changed, but rather the concentration of the reactant at the surface begins to reduce, due to mass transport limitations. Interestingly the calculated rate constant is larger at the higher flowrates, this could be the result of improved wetting of the felt by forcing the electrolyte through at a faster rate. Based on these results, 15 mL min-1 was selected as the most suitable flowrate for future measurements, to accurately identify differences in kinetics at different felts. 117PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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