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Chapter 4 CONCLUSION AND PATH FORWARD A functioning cell and testing setup were assembled and preliminary cell per- formance has been reported. The impacts of several parameters have been considered. These findings constitute a base-line performance which can be referred to in future flow battery research. The peak power density achieved was 0.38 W/cm2. This value is reasonably good, but falls almost 50% below the best result found in the literature [2]. The achieved results are also far inferior to the cell’s ideal performance which is es- timated in Appendix C. Electrode compression did not improve performance, but this might be remedied in the future by preventing flow around the edges of the electrodes. However, it should be recognized that compression also leads to higher pumping costs. To properly evaluate the net improvement due to compression, parasitic pumping losses ought to be considered. Suggested topics for further investigation include performance effects of vana- dium and acid concentrations. The impact of flow fields should also be considered [7]. The provided results indicate a strong relationship between power density and electrolyte state of charge. In commercial applications the charged electrolytes would make several discharge passes through the cell. Therefore, it would be interesting to study decaying power density under multiple passes. Vanadium is very expensive, and for flow batteries to be commercially competitive a less expensive active species may be necessary. Experimentation with new redox couples would be worthwhile. Regarding the experimental setup, peristaltic pumps should replace the cur- rently used syringe pumps. The current pumps are not capable of high flow rates and in order to continuously operate they must frequently change the direction of flow. Due 23PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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