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AhL-1) and energy density (18 WhL-1) to a fresh electrolyte; thus achieving significant improvement up to 38% in vanadium redox flow cell. Moreover, the cyclic performance of a VFRB (Figure 5.7b) remains constant over several cycles, demonstrating the good stability and no degradation of the additive. Figure 5.8. – Performance of VFRB with 0.6%(w/v) dPEI-containing positive electrolytes at 30, 50, and 60oC. Finally, in order to overcome the drawbacks of VRFB related to thermal stability at 60oC, several charge and discharge experiments at 20 mA/cm2 are done to demonstrate the outstanding performance of the dPEI-containing positive electrolyte. Figure 5.8 gives the columbic, voltage and energy efficiency as well as energy density as a function of cycling number and temperature. Stable performance with an energy efficiency of 88% was observed during a course of 40 cycles. This is probably due to the stabilization of the V (V) ions carried out by the dPEI- containing electrolyte. The energy density at 60 o C was 19.5 W h L-1. Note this value is higher than that obtained at 25o C (ca.18 WhL-1). This is probably due to the water evaporation in each compartment leading to an increment of proton concentration. 77PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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