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Table 7.5.- Electrochemical values of Reaction 2 obtained from the cyclic voltammetry showed on the Bottom of Figure 7.15. Iox / mAg-1 Ired / mAg-1 Electrode Eox /V Ered /V ΔE / mV Ired/Iox CF-rGO/Q 0.696 CF-HT 0.684 CF-N 0.705 0.602 94 3030 0.617 67 2548 0.598 107 2869 -2771 -2574 1.01 -3092 1.08 0.914 Furthermore, the electrochemical analyses for several cyclic voltammetries have been done at different scan rates (20 to 1 mV/s) to apply Randles-Sevcik equation (Figure 7.17). It has been always considered as an approximation due to the non- flat surface of the working electrodes used, obtaining the plot of i vs. v1/2. As seen in Figure 7.17d, the slope values for the Ox1/Red1, as well as Ox2/Red2 are related to the mass transfer in the interface electrode-electrolyte for the reactions 1 and 2. It follows the trend: CF-HT > CF-rGO/Q > CF-N. These tendencies are most probably caused due to a larger electrochemical active surface area formed by N and O groups stable on the electrode’s surface, which favors Tiron (benzoquinone) electrode-electrolyte diffusion involved on the main reaction and secondary reaction. It is also noteworthy that reaction 1 has a mass transfer 10 times faster compared to the reaction 2, and as a consequence it is harder to saturate the surface towards this reaction. 170PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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