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14 12 10 8 6 4 2 0 Figure 6.31 – Battery’s capacity as a function of the current density for different modified electrode used as, CF, CF@TiO2 N500 and CF@TiO2 N900 Furthermore, the sample treated at 500oC displays low voltage losses over the charge and discharge if we compare with CF. However, still higher than the nitrided one at 900oC. One of the main reasons for this is the formation of TiN coupled with the nitrogen and oxygen group formation on the carbon felt, which allows a reduced charge transfer resistance. As a consequence of this, during the charge-discharge at 150 mA cm-2, the ohmic drop decreases, from CF@TiO2 N500 to CF@TiO2 N900 by 104 mV and 56 mV for charge and discharge respectively (Figure 6.32). As all components remained constant between tests, any differences on the system are due to the negative electrode. Therefore, the surface properties of the electrodes have a critical influence not only over the redox reaction kinetics, as previously shown, but also its ohmic resistance. 25 mA cm-2 150 mA cm-2 100 mA cm-2 C/D Capacity CF C/D Capacity CF@TiO2 N500 125 mA cm-2 C/D Capacity CF@TiO2 N900 25 mA cm-2 37.5 mA cm-2 50 mA cm-2 75 mA cm-2 0 5 10 15 20 25 30 35 40 cycle 123 C/D Capacity / Ah L-1PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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