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8. Half - Cell Performance of Carbon Felt Samples Abstract Polarization curve and charge / discharge cycling measurements are the most common methods for assessing the performance of VRFB cells in current literature. Both methods provide useful information, but neither provides a complete picture. Typically, only the discharging step is reported for polarization curve work, whilst charge / discharge cycling calculations are complicated by the crossover of vanadium ions during the long duration experiments. Often it is not known what contribution to the overpotential is from the positive and negative redox reactions. In this work, we have used half-cell measurements of the positive vanadium electrolyte, carrying out both polarization curves and charge / discharge cycling for a range of different felt samples. From the polarization curve measurements, the apparent rate constant of the different carbon felts was calculated and compared to the energy efficiency recorded during charge / discharge cycle measurements. Both methods were found to be in agreement, as felt samples with higher apparent rate constants had higher energy efficiencies during charge / discharge measurements. 107PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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