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Chapter 3. Characterisation Methods Nyquist plot, since the shape is important for the graphical inspection. For simple elec- trochemical systems, the graphical inspection allows identification of the physicochemical processes occurring in the system and estimation of e.g. the series and charge transfer resistances. The major drawback of Nyquist plots is that the frequency information is lost. This can be rectified by adding annotations to the Nyquist plot to visualise the start of each frequency decade, or as done more frequently, by including Bode plots, which present log(|Z|) and φ against log(f). The Bode plots for the impedance shown in Figure 3.10 are presented in Figure 3.11. Figure 3.10: 3-dimensional impedance of a simulated R1(R2C) circuit and its three projections onto the (ZRe,−ZIm) plane (green line), the (log(f),ZRe) plane (blue line), and the (log(f),−ZIm) plane (red line). Simulation parameters: fmax = 1 MHz, fmin = 1 Hz, R1 =1Ω,R2 =5Ω,C=10μF,andA=1cm2. Figure 3.11: Bode magnitude (black line) and phase angle (blue line) plots of the impedance shown in Figure 3.10. As mentioned earlier, information about the processes occurring in a system is extracted by modelling the experimental data with an equivalent circuit model. The processes 32PDF Image | Organic Redox Flow Batteries 2023
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