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Study of redox flow battery systems for residential applications 7 Assessment of the work done 7.1 Objectives achieved A new and cheap method to determine all of the vanadium ions concentration was successfully developed and improved. The state of charge of both VRFBs was successfully measured. Charge and discharge limiting tanks were also successfully determined for both batteries. However, capacity limiting tank was not determined for VisBlue 6 and the obtained data was not enough to clarify the causes for electrolyte imbalance to occur for the same battery. On the other hand, for VisBlue 8 the capacity limiting tank and the mechanisms that cause capacity fade were successfully identified. 7.2 Other works carried out An experimental protocol for determination of vanadium ions concentration was developed for VisBlue Aps (Appendix E.1). An excel file to analyse results from titrations was also created. The density of “fresh” vanadium electrolyte was measured for different concentrations with a portable density meter (Densito 30PX, Mettler-Toledo International Inc.) to develop a new, fast and easy-to-use method for electrolyte quality control (Appendix E.2). 7.3 Limitations and future work The titrations may be very effective and cheap, though they are very time consuming. Other methods such as UV-Vis and cyclic voltammetry cannot be excluded as future methods for faster analysis. Furthermore, potentiometric titrations cannot be used as on-line method and so real- time state of charge cannot be determined. For further understanding of what is causing electrolyte imbalance at VisBlue 6 battery, SO4- and H+ ions concentration and permeability rates across the bipolar plate can be determined with methods described by Jiawei et al. and Liuyue et al. [77, 79]. 7.4 Final Assessment As the first Master student of Dr. Martínez and VisBlue Aps, this experience allowed me to gather a lot of knowledge regarding professional life, methodology of learning and working and team cooperation. Also, a lot of knowledge was obtained regarding personal life as this was the first time ever I lived alone and outside of Portugal. Chapter 7: Assessment of the work done 40PDF Image | Tubular Vanadium Air Redox‐flow battery
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