Organic Redox Flow Batteries 2023

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Organic Redox Flow Batteries 2023 ( organic-redox-flow-batteries-2023 )

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Chapter 5. Cell Cycling Figure 5.7: Galvanostatic cell cycling of 15mL 0.2M DHAQ in 1.4M KOH (= 1.0M OH– ) against 15 mL 0.4 M K4[Fe(CN)6] in 1.0 M KOH at ±100 mA cm−2. A potential hold was applied at the voltage limit after every 10th charge and discharge. (a) Cell voltage against capacity for a subset of 100 cycles recorded over 60 h. The dash-dotted line represents the theoretical cell voltage (1.19 V). (b) Charge and discharge capacities and coulombic efficiency against time and cycle number. The dashed grey line in each subplot represents the theoretical capacity (160.8 mA h). and electrolyte loss from leaks. The galvanostatic cycling protocol was therefore repeated without potential holds on fresh electrolytes. The cell was assembled in the same way as described for Experiment 1, the negolyte consisted of 15 mL 0.2 M DHAQ in 1.4 M KOH (= 1.0 M OH– ), and the posolyte consisted of 15 mL 0.4 M K4[Fe(CN)6] in 1.0 M KOH. Polarisation curves were initially recorded following the same procedure as for Experiment 2. The results were similar to the ones from Experiment 2 and are presented in Figure C.6 in Appendix C. 80

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