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5.2. Results and Discussion Figure 5.9: Galvanostatic cell cycling of 10mL 0.2M PPAQ(Na) against 15mL 0.4M K4[Fe(CN)6], both in 1.0 M KOH, at ±25 mA cm−2. (a) Cell voltage against capacity for a subset of 78 cycles recorded over 15 h. The dash-dotted line represents the theoretical cell voltage (1.06 V). (b) Charge and discharge capacities and efficiencies against time and cycle number. The orange line represents a linear regression carried out over the charge capacities (excluding outliers from cycle 27, 52, and 69); the resulting slope is annotated. BK Precision 1687B DC power supply connected to a home-built proportional integral derivative (PID) control unit. The setup was placed in a hermetically sealed cabinet with amber walls to protect from UV light, which was previously reported to degrade the ferri-/ferrocyanide couple [86]. The cabinet was continuously flushed with argon to keep an inert atmosphere. The electrolytes were purged with argon before being placed in the cabinet. The setup was left for 2 h to let the temperature stabilise and the cabinet empty of oxygen before measurements were started. Polarisation curves were recorded at 0.1 V s−1 from 10 % to 100 % SOC in increments of 10 %, in a similar way as described earlier. Both charge segments and polarisation curves were performed with the SP-300 potentiostat. The curves are presented in Figure 5.10 83PDF Image | Organic Redox Flow Batteries 2023
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