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electrocatalytic activity. Note that the cell with dPEI in a positive electrolyte presents a lower charging voltage and higher discharging voltage than the fresh one. The latter is caused by the improvement of kinetics leading to a decrease in voltage losses and an increase in VE. As a consequence of the VE increased, the energy efficiency was largely improved using the 0.6% dPEI-containing positive electrolyte above 84% at a current density of 20 mA/cm2, which is higher than that for VFRB single cell with fresh electrolyte (Figure 5.6b). The improvement in battery efficiency implies a better redox reversibility of the positive electrolyte, which results from the addition of dPEI electrolyte. These results are in accordance with the results of CV test. Figure 5.7. – a) Energy density and discharge capacity of the VFB single cell with pristine and dPEI-containing positive electrolyte. b) Cyclic performance of VFRB with 0.6%(w/v) dPEI-containing positive electrolyte at 25oC at 20 mAcm-2 and 13 mLmin-1. In addition, the discharge capacity and energy density have been calculated for both electrolytes and depicted in Figure 5.7a. Notably, the VFRB with 0.6% dPEI- containing positive electrolytes demonstrates a superior discharge capacity (14.2 76PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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