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2.3 Balance of Plant The anolyte and catholyte were pumped through the cell by two, NE-1000 syringe pumps. Each pump holds a 60 mL syringe and is capable of a maximum flow rate of 28 mL/min. After the electrolytes are pumped through the cell, they are emptied into two separate reservoirs. When discharge is complete, the pumps reverse direction, drawing the electrolyte back through the cell and into the syringe. Both pumps were programmed to automatically repeat this dispense and withdrawal cycle. The anolyte reservoir contains a separate inlet for nitrogen gas which was constantly applied to purge the reservoir of oxygen. The cell was charged and discharged with a VersaSTAT 3 Potentiostat. The potentiostat was paired with a KEPCO power supply to raise the maximum allowable current from 3 A to 20 A. Figure 2.3: Experimental setup. 2.4 Electrolyte Preparation The electrolyte was prepared by stirring a 1.5 M VOSO4 3 M H2SO4 aqueous solution. After 48 hours of mixing the vanadium salt had fully dissolved, yielding sulfate anions and vanadium(IV) oxide cations. In this blue solution, all vanadium ions were in the V(IV) state. After placing equal volumes of this solution in both 10PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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