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passes for the center region of the electrode to become saturated with electrolyte. The frequency of the periodic current spikes equals the frequency of pump reversal. This suggests that the electrolytes at either end of the stream were not being charged at the same rate as the rest of the electrolyte. Figure 3.1: Current vs time for the charging of the V(IV), V(IV) electrolyte pair. 3.2 OCV Stability To measure the electrolyte stability, the cell was charged to 1.63 Volts and left in open-circuit for one hour while the pumps continued to operate. The voltage decay, shown in figure 3.2, followed an inverse exponential fit and the extrapolated steady- state was approximately 1.56 V. It has been reported elsewhere that after several hours, this gradual decay in voltage is followed by a sudden drop to 0.75 V [8]. No explanation was given, but one reason for this drastic change in behavior may be a slight imbalance of vanadium ions between the reservoirs. Once the less concentrated reservoir is depleted of charged ions, the standard potential will become that of V(III) or V(V) relative to V(IV). 13PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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