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(4.6) The stability of the reference electrode is further explored by monitoring the open circuit potential of an all-vanadium redox flow battery at 100% SoC. The voltage profile of the battery (Epositive - Enegative) decreased slightly over time due to the self- discharge of the cell (Figure 4.3a), which is obvious by the change in color of the electrolytes. The individual potential of the positive and negative electrode (Figure 4.3b) revealed that the potential of the two electrodes evolved in opposite direction; the positive electrode potential slowly decreased while the negative one increased. An overlapped sinusoidal oscillation of potential is observed when magnifying the potential profile of the electrode (Figure 4.3c). That oscillation is the noise of the reference electrode because it occurred simultaneously in both electrodes. Therefore, the noise of the potential of the reference is ±10 mV within an interval of ca. 10 h. Because of the low frequency of the noise (10 h), this level of noise is considered to be acceptable for this application, bearing always in mind this limitation when comparing potentials obtained with 10 h difference. (4.5) 62PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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