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Besides, considering the differences on the atomic surface content between the studied electrodes, as seen in Figure 7.14, there is a similar tendency for the N/C and N/O ratio, following: CF-HT > CF-rGO/Q > CF-N with. In case of N/C ratio the values are 0.042, 0.039 and 0.004, respectively. Moreover, when compare N/O ratio the values obtained are 0.13, 0.086 and 0.008, respectively. This evidences the larger proportion N groups on the carbon surface comparatively to carbon and oxygen for the CF-HT electrode.. 100 80 60 40 20 0 Figure 7.14. - Overall table chart showing the content of C, O and N in atomic percentage. 7.3.2.1.2 Electrochemical characterization Initially, cyclic voltammetry (Figure 7.15) is done for the electrodes, CF-HT, CF-N and CF-rGO/Q, giving two redox peaks, quasi-reversible, where in principle the larger one corresponds to the two electrons involve on the quinone redox reaction (Reaction 1), which outcome is a reduction/oxidation ratio similar for all, 0.86, but a difference in the differential of potential between reduction and oxidation. This is minor in case of CF-HT electrode, placing from minor to major as follow: CF-HT (0.4) < CF-rGO/Q (0.6) < CF-N (0.7), seen in Table 7.4. This improvement is due to the larger nitrogen content, as well as the C=O groups which are more electroactive towards the Tiron molecule. C1s O1s N1s 167 CF-HT CF-N CF-rGO/Q CF-HT CF-N CF-HT CF-N CF-rGO/Q % at CF-rGO/QPDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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