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8 Half – cell performance of Carbon Felt Samples Based on the apparent rate constants the G100 felt should have a slightly higher efficiency than the C100 felt. However, the apparent rate constants were calculated from the geometric surface area of the different felts, based on the sample weight and average fiber diameter. C100 was found to have 25% more area than the G100 felt sample, hence the C100 felt showed higher efficiency. The calculated efficiency values in this work should not be used to identify full-cell performance, as the negative cell is often cited as having slower kinetics and being more prone to unwanted side reactions, specifically the hydrogen evolution reaction. Additionally, the vanadium electrolyte concentration in this work was 0.8 M, which is half of what would be used in an operational battery. Therefore, the overpotentials measured here will be higher than in a commercial battery for the positive redox couple. The results however do confirm that polarization curve measurements are an accurate way to calculate the kinetic performance of different felts. Polarization curve measurements can significantly reduce the time needed to analyse the performance of different electrode treatments, which will be helpful in future experimentation. Another advantage of polarization curve measurements is that they provide a good understanding of when mass transport losses become significant during cell operation. Ultimately, polarization curve measurements should also be carried out using the negative electrolyte, with comparison to the efficiency of a full- cell from charge / discharge measurements, to gain a fuller understanding of the VRFB cell operation. 121PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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