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Furthermore, for the electrochemical analysis several cyclic voltammetries have been done at different scan rates, from 20 to 1 mV/s, in order to plot the Randles- Sevcik equation and therefore knows the mass transfer tendency for each one of the electrodes and redox reactions taking place (Figure 7.28). Considering the plotted graph results for the Ox/Red the mass transfer follows (cm2/s): CF- rGO/ROH < CF-HT < CF-rGO/Q. It shows the same behavior as the CV data obtained, which confirms that the electrochemical enhancement of the electrodes could be due to the nitrogen and oxygen groups, especially C-O and O-C=O, as well as graphitic and pyrrolic-N, favoring Anthraquinone-2,7-disulfonic acid disodium salt electrode-electrolyte mass transfer involved on the 2-electron reaction. CF-HT CF-rGO/Q CF-rGO/ROH 0.10 0.05 0.00 -0.05 -0.10 0.0000 0.0075 0.0150 v1/2 (V/s)1/2 0.0225 Figure 7.28. - - Randles-Sevcik plot obtained from cyclic voltammetry at different scan rates (1 to 20 mV/s), which shows the increasing mass-transfer over the electrode as the slope increases. Hence, electrochemical impedance spectroscopy highlights the previous results. CF- rGO/Q as the nitrogen and oxygen content increases (more electrochemically active surface area), as well as the quinone groups, which favor the conductivity electrode-electrolyte towards the 2,7-AQDS redox reaction, and therefore the charge transfer resistance decreases (Figure 7.29). This fact is corroborated by the sample CF-rGO/ROH due to the lack of oxygen content, especially C-O groups, has a lower conductivity towards the reaction probably caused also by the insufficient nitrogen groups, as graphitic and pyrrolic-N. On the contrary, the CF- rGO/Q electrode, as the nitrogen and oxygen groups increase and activate the 183 I/APDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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