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Section 6.5 Evaluation of all twenty-four cell designs capacity is 30 WhL-1 for a total vanadium concentration of 1.6 molL-1. At nominal current density, design 4.6 yields a specific discharge capacity of 15.2WhL-1, corresponding to an electrolyte exploitation of only 50.5 %. Design 1.1 requires a higher flow factor to obtain a comparable discharge capacity for a particular current density. This effect is extensively studied in Section 6.5.2 on page 96. 6.5 Evaluation of all twenty-four cell designs 6.5.1 Coulomb efficiency The Coulomb efficiency of all designs is compared for the lowest studied current density, which is 25 mAcm-2. As shown in Figure 6-6, the Coulomb efficiency increases with an increasing channel geometry factor and an increasing electrode area. Between design 1.1, which has the lowest Coulomb efficiency, and design 4.6, which has the highest Coulomb efficiency, there is a gap of 7.5 %-points. Increasing the active electrode area is found to be effective to increase the Coulomb efficiency. In fact, the Coulomb efficiency of the largest electrode with a short and wide channel (design 4.1) is higher than the Coulomb efficiency of the smallest electrode with a long and narrow channel (design 1.6). For a channel configuration with a higher geometry factor, the electrode enlargement is less effective. In terms of Coulomb efficiency, both, electrode enlargement and narrower and longer channels are approximately equally effective. However, boosting the Coulomb efficiency by both measures, the electrode enlargement and a larger channel geometry factor, face a saturation effect. Figure 6-6: Coulomb efficiency over channel geometry factor and electrode area at 25 mAcm−2 Figure 6-7: Voltage efficiency over electrode area and flow factor (FF) at 100 mAcm−2 95PDF Image | Model-based Design Vanadium Redox Flow Batteries
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