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Chapter 5. Cell Cycling experiment is relatively low. Hence, any capacity fade observed during full cell cycling in this work, that is expected to be chemical in nature, can confidently be ascribed to the quinone species. Figure 5.4: Potentiostatic symmetric cell cycling 10 mL 0.2 M K3[Fe(CN)6]/ K4[Fe(CN)6] against 17mL of the same electrolyte at ±0.2V. (a) Current density against capacity for a subset of 199 cycles recorded over 54h. (b) Charge and discharge capacities and coulombic efficiency against time and cycle number. The orange and azure lines represent linear regressions carried out over the charge and discharge capacities, respectively, from the 30th to the 199th cycle; the resulting slopes are annotated. The dashed grey line in each subplot represents the theoretical capacity (53.6 mA h). 5.2.2 Full Cells 5.2.2.1 DHAQ against Ferrocyanide The full cell cycling of DHAQ against K4[Fe(CN)6] was the first cell cycling experiment to be carried out during the PhD project (also before the symmetric studies, which were in- troduced first to make the point of the ferri-/ferrocyanide couple being reasonably stable). The system was chosen to reproduce literature data [29] while building up experience in conducting cell cycling experiments. Several experiments were carried out, with changes 76PDF Image | Organic Redox Flow Batteries 2023
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