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a) 100 100 80 80 60 60 40 40 20 20 00 0 50 100 150 CE-VE CF CE-VE CF@TiO2 N500 CE-VE CF@TiO2 N900 Current density / mA cm-2 b) 100 80 60 40 20 0 Figure 6.35 – Average efficiencies (CE, VE and EE) as a function of the current density applied for different electrodes in galvanostatic single cell conditions. 6.1.3.3 Mechanism proposed Based on previous research227 and implementing the presented results, the mechanism proposed for the electrodes used is shown in Figure 6.36a and b. Firstly on CF, V3+ ions are adsorbed over the oxygen groups, -OH and C-O, on the carbon felt surface, generating O-V bonds, which breaks a O-H bond in the case where it is adsorbed on the hydroxyl group and releases a proton to the solution. Consequently, an electron is donated to the V3+ reducing it to V2+ and breaking the previously formed bond (O-V) and taking the proton EE CF EE CF@TiO2 N500 EE CF@TiO2 N900 0 25 50 75 100 125 150 175 Current density / mA cm-2 128 Voltage Efficiency / % Energy Efficiency / % Coulombic Efficiency / %PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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