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The experimental cell fabricated with a Nafion 211 membrane was also tested at various current densities at 800 cc/min/cell; the stack energy efficiency and power for the cell are shown in Figures 9 and 10. The average discharge temperature of the electrolyte was ~35°C for all current densities and the pressure drop in the electrolyte circuit was typically less than 10 psi. Figure 9. Stack energy efficiency as a function of current density for a cell fabricated with a Nafion 211 membrane and a flow rate of 800 cc/min/cell. Figure 10. Power as a function of current density for a cell fabricated with a Nafion 211 membrane and a flow rate of 800 cc/min/cell. The advantage of using the Nafion 211 membrane allows the stack to operate at a higher current density (400 mA/cm2) with a 3% increase in stack energy efficiency over the Nafion 212. Quarter 3 will focus on cost performance at the higher current density and Q4 will focus 13PDF Image | High Current Density Redox Flow Batteries
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