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to the lower electrical resistivity of 1186HCBA compared to Sigracet 39AA (0.0011 Ω cm and 0.179 Ω cm, respectively, see also Table A.3). Figure 6.2: (a) Nyquist plots recorded on dry cells assembled with a varying number of pristine or pretreated Sigracet 39AA carbon papers and tightened with different torques. The impedance was recorded from 316 kHz to 100 Hz (shown from ∼56 kHz) at room tem- perature. Black = pristine (3.39 N m); red = pristine (6.78 N m); blue = baked (6.78 N m); crosses = 2×papers; squares = 4×papers; hexagons = 6×papers. (b) Resistances deter- mined from the low-frequency intercept of the Nyquist plots with the real axis, plotted against the number of stacked carbon papers. The dashed lines are linear regressions made over each set of data. 6.2. Results and Discussion Figure 6.3: (a) Nyquist plots recorded on dry cells assembled with 2×pristine or pre- treated 1186HCBA carbon cloths and tightened with different torques. The impedance was recorded from 316 kHz to 100 Hz (black and blue) or 1 kHz (red) (shown from ∼12 kHz) at room temperature. Black = pristine; red = baked for 1h; blue = baked for 24h; tri- angles = 2.26 N m; squares = 4.52 N m; pentagons = 6.78 N m. (b) Resistances determined from the low-frequency intercept of the Nyquist plots with the real axis, plotted against the measured compression rate. The dashed lines are linear regressions made over each set of data. The x-axis is shown down to the theoretical compression rate (39.4 %). 91PDF Image | Organic Redox Flow Batteries 2023
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