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2.3 Long-term Cycling Experiment Figure S4 shows the voltage profiles for a long-term cycling experiment completed immediately prior to the potential stepping experiment. The electrolyte pumps were not turned on during the initial nine cycles and set to 10 mL/min at the tenth cycle. During the first nine cycles only the electrolyte in the cell’s active area was available for cycling, limiting the available charge and cycle time. The Cl2 concentration (Figure S4d) remained low until the electrolyte flow was turned on at the 3-hour mark; then, the Cl2 detected spiked to ~9%. This suggests that the Cl2 is being generated in the cell and is only detected when it’s transported to the vial with the electrolyte. In Figure S4, after the spike following initiation of electrolyte flow, the Cl2 decreases and remains relatively stable near 1%. We can still see the fluctuations that occur during cycling, but they are less pronounced than in the variable current experiment in Figure S2. This limited Cl2 fluctuation may be because of the relatively short cycle time in this set of experiments; the average round trip time during the long-term cycling experiment was about 16 min compared to 2 h in the 10 mA/cm2 step in the variable current experiment. Because time above a critical potential appears to drive the amount of gas generated, the less time spent above this voltage, the smaller the amount of gas generated during this experiment. Conversely, the shorter time per cycle means there is not enough time to reabsorb all the Cl2 into the electrolyte at low voltages, as previously observed. This leads to the low level but persistent amount of Cl2 gas observed in Figure S4d. 22PDF Image | Chlorine Gas Generation in Mixed-Acid Vanadium Redox
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