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M, as well as the current density and the potential of the battery. For this purpose, the cathode active material, p-hydrozybenzene, has been substituted by o- dihydroxybenzene mainly due to its larger solubility, as previously mentioned up to 2 M, which also increases the potential of the battery. 7.3.4.1.2 1,2-benzoquinone (+) vs. anthraquinone 2,7- Disulfonic acid disodium salt (-) Figure 7.37.- Scheme of cathodic redox reaction of o-benzoquinone 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. Secondly, the battery active materials, as shown in Figure 7.37, are initially composed of 0.4M o-hydroxybenzene on the positive side of the battery, which has a standard potential of 0.85 V vs. NHE, while 0.4M sodium 9,10-Anthraquinone-2,7- Disulfonate performing a standard potential of 0.15 V vs. NHE on the negative side. Both of the compounds have been solved in 3M methanosulfonic acid (MSA), as well as the prior case using the p-benzoquinone. The electrode used for both compartments is Carbon felt material. Additionally, some charge-discharge cycles have been done at 25 mA/cm2 current density in order to do an initial experimentally screening of the system at different cut off potentials. Considering the charge-discharge plot, shown in Figure 7.38, it is found that above 0.55 V there is a highly irreversible reaction (side reaction) happening while charging, which is evidenced in a low Coulombic efficiency (66% for 0.6 V and 47% for 1 V) for a single cell. Therefore, the optimum value of Coulombic efficiency is obtained 193PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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