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charge/ discharge rate (mA/cm2): 60 200 50 40 30 20 10 250 300 350 100 80 60 40 20 2M VOSO4 1M VOSO4 Charge Discharge e-u ratio Charge Discharge e-u ratio 00 4 8 12 160 cycle charge/ discharge rate (mA/cm2): 100 200 90 80 70 60 250 300 350 100 2M VOSO4 CE VE EE 1M VOSO4 CE VE EE 80 60 40 Figure 6.20. - On the top, full cell specific capacity and electrolyte utilitation ratio dependency with the current density applied (from 200 to 350 mA/cm2) on GF@TiO2:H for 1 and 2M vanadium concentration in 3M H2SO4 as electrolyte. Above, CE, VE and EE dependecy with the current density applied (from 200 to 350 mA/cm2) for GF@TiO2:H for 1 and 2M vanadium concentration in 3M H2SO4 as electrolyte. Additionally, EE values of 61% at 200 mA/cm2 are obtained much closed to the maximum EE value obtained by Tseng et al (i.e. 65.4%). Besides, the previous experiments at 2M are compared with 1 M electrolyte in order to evaluate the performance of GF@TiO2:H electrode at high current density. In this case, we obtain a specific capacity value, Ah/L (in parenthesis is given the electrolyte-utilization ratio in %) of: 11.77 (88); 10.33 (77); 8.4 (63) and 500 4 8 12 16 cycle 103 electrolyte utilization (e-u) ratio / % Efficiency / % Coulombic Efficiency / % Specific Capacity / Ah/LPDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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