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1 2.3. Chemical and Electrochemical Analytical Techniques 2 Total vanadium concentration was measured off-line using an inductively coupled 3 plasma spectrometer, Liberty Sequential from Varian. Vanadium ions concentration used 4 as reactive in charge VRFB process was measured employing a UV-visible spectrometer, 5 Cary 300 from Agilent, using the Beer-Lambert-law. [56, 57] 6 Electrochemical parameters were controlled and monitored using an Autolab 7 PGSTAT302N (Metrohm) potentiostat controlled by the NOVA 1.11 program. Charge 8 and discharge procedures were programmed using the chrono potentiometry method. In 9 this way, the temporal variation in the OCV and voltage values was monitored during the 10 application of the corresponding value of current density. 11 3. RESULTS AND DISCUSSION 12 13 behaviour of a VRFB charged under different conditions: galvanostatic and under an electrical As stated before, the main objective of this research is focused on the study of the 14 current pattern provided by wind turbines. To make this possible, accelerated ageing tests have 15 been carried out using highly degradable membranes in the VRFB device. 16 Figure 2 shows the time-course of the wind speed, measured during three 17 consecutive days (25th to 27th January, winter) in Ciudad Real, a town in the centre of 18 Spain, (38.59 N 3.55 O). This variation is going to be used as patterns of wind velocity 19 in the tests carried out in this work to compare the performance of VRFB charged 20 galvanostatically and with wind turbines intensity patterns. As it can be observed, the 21 wind speed evolution was discontinuous, just as it may be expected from this energy 22 source. The average wind speed was 1.4 m s-1. For additional information, Part b of Figure 23 2 shows the distribution of measured wind speed according to the International Beaufort 24 scale. According to this classification, the conditions selected as wind pattern for this test 7PDF Image | Vanadium Redox Flow Batteries for wind turbines
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