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3.3 Polarization Polarization curves were generated by controlling current and measuring volt- age. To ensure that measurements would be reliable and repeatable, the cell was first discharged under a fixed current for one minute. This test was conducted for three different current values. The purpose behind this was to ensure that transient effects on voltage polarization were negated. Although some voltage spikes were detected, these were not time dependent and the settling time was undetectable on the timescale of seconds. In the generation of each of the following polarization curves, a current step time of 2 seconds was used. Figure 3.3: Voltage vs time at each of three fixed currents. 3.3.1 State of Charge Although the electrolyte state of charge was not measured quantitatively, it could be qualitatively deduced by variations in open circuit voltage (E0). A higher open circuit voltage corresponds to a greater state of charge though an accurate empirical relationship has not been developed [9]. Cell polarization vs state of charge is shown 15PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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