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7.3.4.1.1 1,4-benzoquinone (+) vs. anthraquinone 2,7- Disulfonic acid disodium salt (-) Figure 7.32.-. Scheme of cathodic redox reaction of p-benzoquinone at 0.70 V vs. NHE potential, as well as, anodic redox reaction of Sodium 9,10-anthraquinone-2,7-disulfonate molecule at 0.15 V vs. NHE potential. Firstly, the system of study, as shown in Figure 7.32, is made of a combination of 0.4M p-hydroxybenzene on the positive side of the battery with a standard potential of 0.70 V vs. NHE, while 0.4M sodium 9,10-Anthraquinone-2,7-Disulfonate on the negative side with a standard potential of 0.15 V vs. NHE. Both compounds have been solved in 3M methanosulfonic acid (MSA), as this acid shows the better performance towards quinones redox reaction. The electrodes used for both compartments are Carbon felt. Moreover, some charge-discharge cycling has been done at a current density of 25 mA/cm2 in order to do an initial experimentally screening of the system. The charge-discharge plot of the single cell, which is shown in Figure 7.33, evidences the easily visual changes happening in the electrolytes. In a first instance, the electrolytes are completely discharged showing a transparent-pink colored catholyte and an orange colored anolyte. When charged the color changes, the catholyte turns to a light orange color while the anolyte does it to a dark-green color. Besides, considering the charge-discharge plot, shown in Figure 7.33, it is found two plateaus for charge and discharge as well. They fit with two redox reactions which are reversible as the Coulombic efficiency performance is above 95%, exactly 97.2%. In consequence, there will not have significant electrolyte degradation or cross-over to make the cycling to fail. However, as it is also shown, the voltage 188PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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