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Table 6.7- Performances displayed for all electrodes studied in three electrode voltammetry for positive electrodes: oxidation, reduction and differential potential (Eox, Ered, ΔE, mAg-1); oxidation and reduction intensity (Iox, Ired, mA) and intensity ratio (Ired/Iox). Iox / mA Ired / mA Eox / V Ered / V Ired/Iox Sample ΔE / V GC-CNPs GC-CNPs@CeO2 GC-CNPs@CeO2-x 600 400 200 0 1.124 1.214 1.163 0.9694 0.15 0.9265 0.29 1.025 0.14 0.795 0.4311 0.7137 0.165 0.21 0.07489 0.17 0.5153 0.72 GF@CeO2 GF@CeO2-x GF 0 200 400 600 Re(Z) / Ohm Figure 6.42. - Electrochemical impedance spectroscopy (EIS) has been done in a three- conventional electrode (0.25 cm2) using GF, GF@CeO2 and GF@CeO2-x as working electrode and Hg/Hg2SO4 and platinum wire such as reference electrode and counter electrode, respectively. Electrolyte solution was 0.05 M V3+ in a 3 M H2SO4. EIS measurements were performed at open circuit potential (i.e. -0,33V vs. NHE) of 5 mV amplitude in the frequency range of 0.1-200 kHz at room temperature. Besides, as we observed in the CV after the vanadium oxidation peak there is an oxygen evolution reaction that does not happen in presence of the Ceria (Figure 6.41). It is a consequence of the standard redox potential of cerium, as metal oxide, in between the VO2+/VO2+ reaction and the OER, shifting the OER initial point at higher values. Therefore, the enhancement of the electrocatalytic properties in combination with the low oxygen-evolution reaction of the GF@CeO2-x electrode demonstrates a superior performance on the positive electrode. 137 - Im(Z) / OhmPDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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