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Besides, considering the structural surface differences between the studied electrodes, as seen in Figure 7.26, there is a similar tendency for the O/C and N/C ratio. Both follow the trend: CF-rGO/Q > CF-HT > CF-rGO/ROH. The values for O/C are 0.4, 0.3 and 0.2, respectively. In case of N/C ratio the values are 0.04, 0.04 and 0.02. This evidences the larger proportion of O and N groups on the carbon surface in case of the CF-rGO/Q electrode. 100 80 60 40 20 0 Figure 7.26. - Overall table chart showing the content of C, O and N in atomic percentage. 7.3.3.1.2 Electrochemical characterization Concurrently, Physical characterization is followed by the electrochemical characterization. Cyclic voltammetry (Figure 7.27) at two different scan rates, 1 and 20 mV/s are done for the electrodes CF-HT, CF-rGO/ROH and CF-rGO/Q gives a quasi-reversible redox peak, which corresponds to the two electrons involve in the quinone redox reaction (Figure 7.27), which outcome is a reduction-oxidation ratio following the trend: CF-rGO/ROH (0.87) < CF-rGO/Q (0.95) < CF-HT (0.96). In spite the fact that the CF-HT performs slightly better than the rGO quinone modified electrode, the voltage differential between reduction and oxidation does not follow the same tendency (V): CF-rGO/ROH (0.59) > CF-HT (0.53) > CF-rGO/Q (0.40), seen in Table 7.7. It is the reason to initially suggest an enhanced performance for CF-rGO/Q electrode towards the anthraquinone molecule (2,7- AQDS) in the anolyte, which is a consequence of the large O/C and N/C ratio on the surface electrode, as well as the larger C-O group’s content. C1s O1s N1s 181 CF-HT CF-rGO/ROH CF-rGO/Q CF-HT CF-rGO/ROH CF-rGO/Q CF-HT CF-rGO/ROH % at CF-rGO/QPDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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