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In addition, it is analyzed the capacity retention on each one of the electrodes likewise the previously commented efficiencies. Seeing Figure 6.46a, all the electrodes get retention above 80% electrolyte utilization ratio at 50 mA/cm2 of current density. However, as we increase it, the capacity retention decays. It is the case of GF, giving values below 50% at 100 mA/cm2. The same issue happens for GF@CeO2(+) vs. GF(-) at 150 mA/cm2, but not in case of GF(+) vs. GF@TiO2:H holding a 60% retention at the same current density. Although the best performance at 150 mA/cm2 it is shown when our battery is enhanced in the positive side by a Ceria shell reduced and a reduced Rutile in the negative around a Graphite Felt core (80% capacity retention), they faded to a 60% electrolyte utilization ratio when 200 mA/cm2 is applied. a) 100 80 60 40 current density / mA/cm2 : 50 100 150 200 GF GF@CeO2 (+) GF@TiO2:H (-) GF@CeO2 (+) vs. GF@TiO2:H (-) GF@CeO2-x (+) vs. GF@TiO2:H (-) E/V Capacity Retention / % b) 1.8 1.6 1.4 1.2 1.0 cycle GF@Ce (+) GF@TiO2:H (-) 150 mA/cm2 20 00 4 8 12 16 GF@TiO2:H (-) vs. GF@CeO2 (+) GF@TiO2:H (-) vs. GF@CeO2-x (+) 0.80 4 8 12 16 20 Specific Capacity / AhL-1 Figure 6.46. – a) Current density dependence with capacity retention of over cycles. b) Voltage profile correlating charge/discharge process performed at 150 mAcm-2 using an electrlyte of 1.5 M vanadium ions in 3M H2SO4. 142PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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