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circulated through the graphite felt at a flow rate of 50 mL min 1. Galvanostatic 2.0/2.3 M) were conducted. Charge and discharge experiments were conducted and 100 cycles were obtained with a CE of 99%, VE of 87% and an EE of 86% and an average electrolytes, the flow cells were cycled at current densities of 2.5 mA cm 2 at 1.5 M and 1.0 mA cm 2 at 2.0 M. The theoretical energy density of the system with 2.0 M TEMPO is 126 and is much higher than for a conventional VRFB. Due to the high energy density and overall voltage of 3.5 V, TEMPO is a promising candidate for flow batteries. 7. Overview of some redox reactions of importance for RFBs Redox couples Br-/Br2 Cr2+/Cr3+ 1.09 V Aqueous Zn/Zn2+ -0.76 V Aqueous - Fe2+/Fe3+ 0.77 V Aqueous 6 10-5 2M -0.41 Aqueous 2.2 10-5 2M VO2+/VO2+ V2+/V3+ 1.0 V -0.25 V Aqueous 10-6 1.6 2M Aqueous 10-6 1.6 2M Br3-/Br- +1.09 V Aqueous 4 x 10-5 1 M NaBr saturated with Br S42-/S22- -0.265 V Aqueous I3-/I- +0.54 V Aqueous - 5.0 M ZnI2 3 x 10-6 2 M Na2S Zn/Zn2+ -0.76 V Aqueous - 5.0 M ZnI2 U0 vs. SHE Aqueous/ non- aqueous k0 / cm s-1 Concentration Nu ele Ce3+/Ce4+ +1.28 to +1.72 V Aqueous - 0.2 M Ce(III) methanesulfonate Page 39 of 63 m o cPDF Image | Redox Flow Batteries Concepts Chemistries
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