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Redox Flow Batteries Vanadium to Earth Quinones

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Redox Flow Batteries Vanadium to Earth Quinones ( redox-flow-batteries-vanadium-earth-quinones )

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Figure 3.8. – a) Scheme of a single cell system showing each of the parts separately. b) Picture of the whole single cell device completely discharged. c) Picture of the whole single cell device completely charged. Furthermore, in case of AORFBs the electrolytes are prepared by dissolving 0.05, 0.3 and/or 0.4 M organic active material (Alfa Aesar) in 3 M MeSO3H (Aldrich, 99%) solutions. The aqueous organic redox flow single-cell performance was measured using an “in-house” designed flow cell system, which has been described in Figure 3.8Error! Reference source not found.. The ingle-cell used is assembled sandwiching the membrane Nafion® 117 (6cm × 6cm) between two pieces of working electrodes with an area of 4 cm2, approximately compressed a 30%. Each electrode in their half-cell was placed in a groove on outer face of the graphite bipolar plates which were etched with 3 serpentines flow fields with diameter of 2 mm. The inner faces of the bipolar plate were deposited a sputtered layer of copper such as current collector. Viton® gasket is used to avoid the electrolyte leakage. Metallic aluminium end-plates were used to close the cell. In order to investigate the effect of several modifications on the carbonaceous felt, different materials have been used as negative and positive electrodes. The single-cell was connected to two glass reservoirs containing 15 or 12.5 mL catholytes and anolytes (Figure 3.9), respectively. The flow rate at each side was 75 mL min-1 and the negative reservoir was continuously purged with nitrogen to avoid any oxidation of the active species. The flow cell was cycled to 0.8 - 1 V and then discharged to 0 V, at different current densities, 2.5 to 70-25 mAcm-2. Even more, a reference “in house” electrode, Ag/Ag2SO4, is include in between the two porous carbon electrodes to follow the reactions on the positive and negative side independently. The performance evaluation method for Aqueous organic redox flow single cell is mainly determined by the following efficiencies: 1) Coulombic efficiency (CE), the ratio of the 52

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Redox Flow Batteries Vanadium to Earth Quinones

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