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where PE and cell voltage increase rapidly (shaded part of Figure 2). This transition coincides with the onset of Cl2 generation, as indicated by the dashed lines. The onset occurs at a cell voltage of 1.52 V and a PE voltage of 0.59 V vs Pt and corresponds to ~74% of the state of charge based on the charging capacity of this cell. During stage 2, the Cl2 concentration grows Figure 2: Charging during the first cycle of the 10 mA/cm2 current region shown in Figure 1. a) Cell voltage. b) Positive electrode voltage vs Pt pseudo reference electrode (RE). c) Negative electrode voltage vs RE. d) Cl2 gas concentration in the posolyte vial headspace. rapidly until it reaches a peak of 4.6%. Generally, the PE and cell voltage mirror each other very well suggesting the PE is dominating changes in the cell voltage. In stage one, the cell and PE voltages have slopes of 0.036 mV/s and 0.030 mV/s, respectively. At the start of the transition period the cell and PE voltages spike dramatically with increases of 140 mV and 136 mV, respectively, in seven minutes. In stage two, the remainder of the charge step, the voltages level off with slopes of 6PDF Image | Chlorine Gas Generation in Mixed-Acid Vanadium Redox
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