Redox Flow Batteries Vanadium to Earth Quinones

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Redox Flow Batteries Vanadium to Earth Quinones ( redox-flow-batteries-vanadium-earth-quinones )

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a) 24 20 16 12 8 4 charge/ discharge rate (mA/cm2): 1M VOSO4 12.5 25 37.5 50 75 100 125 150 100 GF@TiO2 GF@TiO2:H 00 4 8 12 16 20 24 28 320 cycle b) 90 80 70 60 500 4 8 80 60 40 20 charge/ discharge rate (mA/cm2): 100 12.5 25 37.5 50 75 100 125 150 12.5 GF@ TiO2 GF@TiO2:H 12 16 20 24 28 32 36 cycle Figure 6.18. - a) Full cell specific capacity and electrolyte-utilization ratio depencency with the current density applied (from 12.5 to 150 mA/cm2) on GF@TiO2 and GF@TiO2:H as electrodes, for 1M vanadium concentration and 3M H2SO4 as electrolyte; b) Full cell EE dependency with the applied current density (from 12.5 to 150 mA/cm2) of GF@TiO2 and GF@TiO2:H as electrodes, for 1M vanadium concentration and 3M H2SO4 as electrolyte. Then, it is performed a long cycling test at 1M VOSO4 at the optimum mentioned value for GF@TiO2:H electrode, 150 mA/cm2 (Figure 6.19). Notably, the performance in terms of specific capacity discharged and EE of GF@TiO2:H electrode remained almost unchanged, exhibiting excellent long-term stability after 100 cycles. The GF@TiO2:H electrode showed an energy efficiency of 71.2 % at 125mA/cm2 and 66.1 % at a rate of 150mA/cm2; in both cases the specific capacity is maintained at a value ca. 11 Ah/L. After high current 101 Energy Efficiency / % Specific Capacity / Ah/L electrolyte-utilization ratio / %

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