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0.24 0.22 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 8 4 3 2 1 0 0.5 1.0 Rf W 0.10 0.15 0.20 0.25 v1/2 (V s–1)1/2 0.30 0.35 0 mol l–1 0.00893 mol l–1 0.0161 mol l–1 0.0196 mol l–1 0.0232 mol l–1 0.0286 mol l–1 R2 = 0.99 R2 = 0.98 R2 = 0.98 R2 = 0.99 R2 = 0.99 R2 = 0.99 Figure 6. Plots of the anodic peak current versus the square root of scan rates (y1/2) for the electrolytes with different concentrations of Fe(III). C1 5Rs CPE R C2 i 1.5 2.0 2.5 Z¢ (W) blank 0.00893 mol l–1 0.0161 mol l–1 0.0196 mol l–1 0.0232 mol l–1 0.0286 mol l–1 4.0 4.5 5.0 Rct Figure 7. Nyquist spectra of electrochemical impedance spectra of the electrolyte with different concentrations of Fe(III). Table 3. The diffusion coefficient of V(IV) species in electrolyte with different concentrations of Fe(III). 3.0 3.5 sample (mol l21) D1 1026(cm2 s21) D2 1026(cm2 s21) 0 0.00893 0.0161 2.06 2.47 2.72 3.33 4.00 4.40 0.0196 0.0232 0.0286 2.44 1.82 1.78 3.95 2.94 2.88 solution resistance, interface resistance, electrolyte film resistance and charge transfer resistance than the pristine one, which indicated that the processes of mass transfer and charge transfer were more difficult after adding too large amounts of Fe(III). But the Rs, Ri, Rf, Rct and Warburg impedance W showed a minimum value when adding 0.0196 mol l21 Fe(III), which indicated the 0.0196 mol l21 Fe(III) enhanced the electrochemical activity and the diffusivity of vanadium ions. However, the royalsocietypublishing.org/journal/rsos R. Soc. open sci. 6: 181309 Downloaded from https://royalsocietypublishing.org/ on 11 January 2023 –Z≤ (W) current (A)PDF Image | Effect of Fe3 positive electrolyte vanadium redox flow
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