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density applied. However, the voltage efficiency values show another fact which is the reduction to 82% for GF-TiO2(MNRs), from 93 and 92% for GF-TiO2(NPs) and GF-TiO2(SNRs) respectively. This decreasing is, as it is previously said, due to the semiconductor properties titanium dioxide. Therefore, as titanium dioxide thickness is increased the electrode polarization also increases. As the voltage efficiency works as limiting factor, the energy efficiency follows the same tendency with close percentage values: GF-TiO2 NPs (91%) > GF-TiO2 SNRs (89%) > GF-TiO2 MNRs (80%). As a consequence of that overvoltage polarization, further treatments are done in the following section. a) 1.8 1.6 1.4 1.2 1.0 0.8 25 mA/cm2 GF-P GF-HT GF-TiO2(SNRs) GF-TiO2(NPs) GF-TiO2(MNRs) 0 2 4 6 8 10 12 14 Specific Capacity / Ah/L b) GF-TiO2(SNRs) GF-TiO2(NPs) GF-TiO2(MNRs) 100 100 100 909090 808080 707070 6025506025506025 50 Current Density / mA/cm2 Figure 6.7. – a) Charge-discharge voltage plot profiles for GF-P, GF-HT, GF-TiO2(SNRs), GF-TiO2(NPs) and GF-TiO2(MNRs) at 25 mA/cm2 as current density applied b) Coulombic, Voltage and Energy Efficiencies for GF-TiO2(SNRs), GF-TiO2(NPs) and GF-TiO2(MNRs) at two different current densities 25 and 50 mA/cm2. Coulombic Efficiency / % Voltage Efficiency / % Energy Efficiency / % E/V 90PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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