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Figure 7.40.- Scheme of cathodic redox reaction of Sodium 4,5-dihydroxybenzene-1,3- disulfonate at 0.85 V vs. NHE potential, as well as, anodic redox reaction of Sodium 9,10- anthraquinone-2,7-disulfonate specie at 0.15 V vs. NHE potential. Initially, it is studied the self-discharge of the battery for that purpose a reference electrode is introduce in the battery, as shown in Figure 7.35. Afterwards, the OCV potential is followed once the cell is fully charged. There is no significantly self- discharge of the system among time (Figure 7.41a). However, after cycling it is more sensitive to a smooth auto-discharge in the negative side of the cell, remaining the positive side unchanged after cycling. At the beginning, a new cut-off voltage screening has been done from 0.7 to 1.4 V with an increment of 0.1V each cycle (Figure 7.41b). As the voltage is increased, the capacity of the battery also increases up to 1.1 V, from this value the capacity starts to decay which is probably caused by a non-reversible processes. As Figure 7.41c shows, there is a rapid decay in the charge-discharge cycling time, confirmed by the Coulombic efficiency for each potential. The Coulombic efficiency increases from 76.6% when 1.1 V is applied up to 96.8% when the potential cell is 1.4 V (Figure 7.41d). 196PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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