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1 consecutive charge/discharge cycles, it was monitored the variation of the vanadium 2 species. Figure 6 shows the variation in the UV-Vis spectra for the positive and negative 3 electrolytes during the first charging cycle. 4 As it can be observed, the maximum peak of absorbance for the VO2+ decreases 5 during the charge procedure until it disappears when it was totally oxidized to VO2+. In 6 the same way, the peak of absorbance obtained at 400 nm for the V3+ decreases until a 7 minimum value, obtained when it was totally reduced to V2+. Taking into account this 8 consideration, in the consecutive charge/discharge cycles, achieving the same value of 9 OCV, the same maximum absorbance peaks must be obtained in the UV-Vis 10 spectrophotometric analysis. 11 Figure 7 shows the total amount of vanadium present in the positive and negative 12 electrolytes as VO2+ and V3+, respectively. In this Figure, it can be observed that in the 13 consecutive charge/discharge cycles, the total amount of VO2+ and V3+ contained in the 14 electrolyte decrease, both under the galvanostatic mode and also under the wind charging 15 procedures. Although, these results could indicate an irreversible character in the redox 16 reactions involved in the performance of the vanadium redox flow battery, they can also 17 be associated to the crossover of the electrolyte, which in turn is caused by the degradation 18 of the membrane. In this way, despite the same value of OCV was obtained in the different 19 charge/discharge cycles, this parameter does not indicate the real state of charge of the 20 battery with the ageing. Thus, the same value of OCV is obtained with lower amounts of 21 VO2+ and V2+ in the total state of charge of the battery. The same observation was pointed 22 out by other authors, which have related different degradation procedures occurring in 23 the elements of the VRFB (membrane, electrolyte and electrodes) with the decrease in 24 the SOC during successive charge / discharge cycles [59]. 25 11PDF Image | Vanadium Redox Flow Batteries for wind turbines
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