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4 EIS at carbon fiber cylindrical microelectrodes Results and discussion Figure 4.1 shows impedance spectra at two selected potentials. Figure 4.1: Impedance spectra for a carbon fiber. Red points are experimental data at the reversible potential, blue points are at an overpotential of +0.1 V. Black solid lines are fitted curves; dashed lines are extensions into the lower frequency region that was not used in the fit. As usual, the high-frequency semicircle in the Nyquist plots arises from the charge-transfer resistance and double-layer capacitance. The lower frequency feature is the mass transport impedance, which rises to a plateau as predicted. In the case of the reversible potential, at the lowest measured frequencies the imaginary part of the impedance decreased again, possibly due to convection. At higher overpotentials, the low-frequency region became noisy and this decrease was not seen. The value of d determines the frequency at which the rise to the plateau occurs and the value of determines the height of the plateau. 46PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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