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A galvanostatic cycling protocol was started at ±100 mA cm−2, 100 mL min−1, and room temperature. The results are shown in Figure 5.8. The observed capacity fade of 30.5 mA h d−1 (21.2 % d−1) is considerably higher than observed during Experiment 1. Although the experiment was originally planned for 300 cycles, a tear formed in the posolyte pump tubing during the 88th cycle, which resulted in the posolyte spilling out on the pump head and into the tray the setup was placed in. It is unlikely that this was the cause of the faster capacity fade, as even a small tear in the pump tubing would cause the electrolyte to leak out quickly and interrupt the measurement, which is exactly what was observed after the 88th cycle. Figure 5.8: Galvanostatic cell cycling of 15mL 0.2M DHAQ in 1.4M KOH (= 1.0M OH– ) against 15 mL 0.4 M K4[Fe(CN)6] in 1.0 M KOH at ±100 mA cm−2. (a) Cell voltage against capacity for a subset of 88 cycles recorded over 42 h. The dash-dotted line rep- resents the theoretical cell voltage (1.19V). (b) Charge and discharge capacities and efficiencies against time and cycle number. The orange line represents a linear regression carried out over a subset of the charge capacity data; the resulting slope is annotated. The dashed grey line in each subplot represents the theoretical capacity (160.8 mA h). 5.2. Results and Discussion 81PDF Image | Organic Redox Flow Batteries 2023
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