Basics of Corrosion and Impedance in Electrochemical Systems
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Introduction to Section 1 (2:09)
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What is Electrochemical Impedance Spectroscopy? (4:31)
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Understanding the Corroding Surface (9:33)
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Resistive response of a simple corroding surface and Stern-Geary equation (5:23)
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Double layer capacitance (3:21)
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Electrolyte resistance (3:43)
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Alternating current (AC) signals (2:29)
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Understanding the concept of impedance (8:23)
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Connecting impedances in series and in parallel (7:13)
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Summary of Section 1 (2:52)
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Section 1 Quiz
Surface processes and EIS responses
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Introduction to Section 2 (2:05)
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Measuring the EIS spectrum (10:03)
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Interactive App: Simulate EIS signal (0:36)
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Effects of polarisation resistance, electrolyte resistance and double layer capacitance (6:06)
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Interactive App: Simulate EIS spectrum (0:26)
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Interactive App: Simulate EIS spectrum (multi-curve) (0:25)
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Impact of frequency range on resolvable parameters (5:49)
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Impact of surface layers on EIS response (14:14)
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Interactive App: Effect of parameters on EIS for surface with layer (0:55)
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Effect of area and relative area on EIS spectra (11:57)
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EIS response of a surface supporting a coating with defects (8:09)
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Interactive App: Effect of relative area of regions with different behaviour. (0:46)
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Interactive App: Effect of relative area of regions (multi curve) (0:24)
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Summary of Section 2 (1:22)
Practical considerations for the measurement of EIS spectra
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Introduction to Section 3 (1:56)
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Measuring EIS at the corrosion potential (4:13)
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Influence of signal amplitude on the EIS measurement (11:40)
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Interactive App: Current response near corrosion potential (0:23)
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Impact of measurement frequency range on measurement time (12:40)
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Interactive App: Impact of parameters on measurement time (0:26)
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Charge passed during EIS measurements (6:22)
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Interactive App: Thickness of oxidised material (0:42)
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Requirement of stationarity and noise-related issues (9:18)
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S3 Summary (1:51)
Interpreting EIS spectra using equivalent circuit models and fitting
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Introduction to Section 4 (2:04)
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How fitting works (12:56)
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Interactive App: Fitting process and error surface
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Characteristic responses of individual equivalent circuit components (8:45)
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Interactive App: Individual components impedance (0:28)
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Key features in EIS spectra (13:44)
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Interactive App: Response of circuit containing a CPE
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Interactive App: Response of circuit containing CPE and Warburg short. (0:22)
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Constructing an equivalent circuit model (16:28)
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Practical example of fitting EIS data (16:36)
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Interactive App: Fitting Example
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Summary of Section 4 (1:57)
