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Chapter 5. Cell Cycling achieved discharge capacity (∼52.4 mA h) was also higher than what was achieved during galvanostatic cycling, and furthermore, both charge and discharge capacities increased slightly with time on average, as seen from the slopes annotated in Figure 5.2 (b). This tentatively confirms that the capacity fade observed during galvanostatic cycling was caused by the membrane, and shows that potentiostatic holds are useful for accessing more of the available capacity. Figure 5.2: Potentiostatic symmetric cell cycling of 10 mL 0.2 M K3[Fe(CN)6]/ K4[Fe(CN)6] at ±0.2V. (a) Current density against capacity for a subset of 27 cycles recorded over 9 h. (b) Charge and discharge capacities and coulombic efficiency against time and cycle number. The orange and azure lines represent linear regressions carried out over the charge and discharge capacities, respectively; the resulting slopes are annotated. The dashed grey line in each subplot represents the theoretical capacity (53.6 mA h). Experiment 2. The second experiment was performed to introduce a CLS, obtain cyc- ling data at different current loads and over a longer time period, and to check if the discrepancy in charge to discharge capacity could be observed again. The same cell as- sembly as for the first experiment was used, but with fresh electrolytes and employing a CLS of 10mL on the negative side against 17mL on the positive side. The system was cycled galvanostatically at four different current densities (±10 mA cm−2, ±20 mA cm−2, ±40 mA cm−2, and ±80 mA cm−2) for 10 cycles each to voltage limits of ±0.4 V, using a 74PDF Image | Organic Redox Flow Batteries 2023
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