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6 Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation A model for the electrochemical impedance spectroscopy (EIS) response of cylindrical fibers has been developed and can be used to accurately measure the standard heterogeneous rate constant [188]. This method is described in detail in Chapter 4 of this thesis. Briefly, the modelled response can be fitted to the experimental results using seven physical parameters, 𝛹 is a composite parameter independent of electrode radius, 𝜏𝑑 is a diffusion time constant, 𝑅𝑐𝑡 is the charge transfer resistance, 𝑅𝑠 is the solution resistance, Υ0 is the admittance constant which combined with the dimensionless constant 𝜙 models the double layer capacitance using a constant phase element, (Figure 6.7). Figure 6.7: Example fit from a thermally treated Toray fiber, EIS recorded at OCP with a 5 mV rms AC perturbation between 10 kHz and 100 mHz. Red circles represent experimental data points; blue line is the fitted model response. 85PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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