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BioLogic SP-300 potentiostat. The electrolytes were recirculated at 60 mL min−1 and the system was kept at room temperature. The results are presented in Figure 5.3 and show a clear decrease in capacity with increasing current density, which is caused by an increase in ohmic resistance with increasing current. Figure 5.3: Galvanostatic symmetric cell cycling of 10 mL 0.2 M K3[Fe(CN)6]/ K4[Fe(CN)6] against 17 mL of the same electrolyte at ±10 mA cm−2, ±20 mA cm−2, ±40 mA cm−2, and ±80 mA cm−2. (a) Cell voltage against capacity of the second cycle recorded at each current density. (b) Charge and discharge capacities and coulombic efficiency against cycle number. The dashed grey line in each subplot represents the theoretical capacity (53.6 mA h). A potentiostatic cycling protocol at ±0.2V was subsequently applied to the system, re- cording 199 cycles over 54 h. A subset of the resulting cycling curves and all the achieved capacities are shown in Figure 5.4. As previously, the attained discharge capacity was around 2 mA h higher than the charge capacity. A stabilisation period of approximately 8 h is observed for both the charge and discharge capacities, after which the cell cycles in a stable manner over 46h and 170 cycles. A linear regression was carried out for both capacities from the 30th cycle and onwards; the charge capacity was found to decrease by 0.004 mA h d−1 (0.008 % d−1), whereas the discharge capacity increased by 0.016 mA h d−1 (0.030 % d−1). Compared to the fade rates previously reported for various quinones [24, 25, 30] (see also Table 2.2), the fade rate observed for the ferri-/ferrocyanide couple in this 5.2. Results and Discussion 75PDF Image | Organic Redox Flow Batteries 2023
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