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Afterwards, it is plotted 1/Rct vs. fknee in order to obtain a relationship. It shows the same tendency as well, presenting a linear relationship between the conductivity of the electrodes and the frequency at which the charge transfer occurs. This evidences that the larger the frequency at which the charge transfer occurs, the lower is the charge transfer resistance value. 40 30 20 10 00 10 20 30 40 Re(Z) / Ohm 0,10 0,08 0,06 0,04 0,02 0,00 0,00 0,08 0,16 0,24 fknee / Hz Figure 7.18.-Top. EIS for the electrodes CF-HT, CF-N and CF-rGO/Q at a fixed potential of 0.63 V vs. NHE, using CF as counter electrode and Hg/Hg2SO4 as reference in a 0.05M Tiron 3 M MeSO3H solution. Bottom. linear tendency of the inverse of the charge transfer resistance (conductivity) versus the knee frequency. Thus, considering charge-discharge plots at high current (Figure 7.19a), 100 mA/cm2, overall charge and discharge capacity (mAh) are larger for CF-HT (0.272) > CF-rGO/Q (0.256) ≈ CF-N (0.256). However, in case it is taking into account only the larger plateau (Reaction 1) the capacity is greater for the GF-rGO/Q and GF-N CF-rGO/Q CF-HT CF-N PEIS at 0.63 vs. NHE CF-N CF-rGO/Q CF-HT 172 1/Rct / S -Im(Z) / OhmPDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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