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Figure 6.24: Nyquist plots recorded on a one-container symmetric cell containing 0.05 M DBEAQ+0.05 M DBEAHQ dissolved in 1.2 M KOH (= 1.0 M OH – ). The impedance was recorded from 200 kHz to 10 mHz (10 mL min−1 and 30 mL min−1) or to 20 mHz (50mLmin−1, 70mLmin−1, and 90mLmin−1) at room temperature and flow rates ran- ging from 10–90mLmin−1. Each spectrum is an average of three spectra recorded in succession and were shifted by 0Ωcm2, 0.02Ωcm2, 0.04Ωcm2, 0Ωcm2, and 0.04Ωcm2 along the real axis (in the order 10 mL min−1 to 90 mL min−1). Figure 6.25: Results from the CNLS fit of the 0.05 M DBEAQ+0.05 M DBEAHQ impe- dance recorded at 50 mL min−1 presented in Figure 6.24. (a) Experimental and modelled Nyquist plots. (b) Experimental and modelled semi-logarithmic Bode plots of the ima- ginary impedance. (c) Kramers-Kronig test residuals. (d) Relative fit residuals. assembly, the series resistance was the predominant contribution to the total resistance. However, as opposed to the DHAQ experiment, the series resistance of the DBEAQ system did not change with the electrolyte flow rate. The system had been in use for 3d when the experiment with DBEAQ was started, so the equilibration between membrane and 6.2. Results and Discussion 111PDF Image | Organic Redox Flow Batteries 2023
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