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In fact, the enhanced performance in VRFB for GF@TiO2-x:H electrode was significantly evidenced at highest charge/discharge rate (Figure 6.17b), where HER has a major contribution. The most remarkable feature was the loss of electrolyte-utilization ratio of VRFB using GF@TiO2 electrode when increasing the charge/discharge rate up to 125mA/cm2, achieving ~7 Ah/L of specific capacity, while GF@TiO2:H presents a value close to 12 Ah/L. It is attributed to large polarization and high over-potentials working at such high currents for a semiconductor material, limiting their rate capability. As a result, poor specific overall efficiencies were obtained (i.e. EE is 55.6% value for TiO2, while the reduced electrode achieve a 70.7%). The GF@TiO2:H electrode presents higher electrical properties and fast electron transfer causing low polarization and an increment in the operating current density range up to high current densities, see Figure 6.18. Comparatively for 1M of active electrolyte it was run for several cycles increasing the applied current density from 12.5 to 125 mA/cm2 for GF@TiO2, where it is obtained an optimum value of 80% electrolyte utilization at 50 mA/cm2. It gives us a value close to 12 Ah/L. Same case-scenario for the reduced electrode obtaining an optimum (same values as mentioned before) at 150 mA/cm2. 100PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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