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Method and characterisation Figure β3.10 Example of Nyquist plot of impedance spectroscopy in fuel cell system [158] The Nyquist plot represents two semi-circle (or arc). These semi-circles are a classic example of the Nyquist plot for real electrochemical system. In Figure β3.10, the y-axis represents the imaginary part of the impedance whereas the x-axis represents the real part of the impedance. At high frequency range (left hand of the semicircle), where the semi-circle intercepts with the real axis (x-axis) shows the membrane resistivity (RΞ©) which is mainly the MEA resistivity. The frequency starts to decrease as the semi- circle moves to the right. The semi-circle of Nyquist plot shows the anode and cathode loss (the oxidation of methanol at the anode and the reduction of oxygen at the cathode). In other words, it represents the charge transfer from anode to cathode [158]. However, in this research the main concern of Nyquist plot was the semi-circle (arc) intercept with x-axis which represents the membrane resistivity (RΞ©) to obtain the proton conductivity of the MEA by the following formula [160]: π= π πΊ π΄βπΏπ RΞ©: membrane resistivity, A: active area of membrane Lm : membrane thinness (3.5) Sirhan AL-Batty Page 87PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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