Electrochemical Impedance Spectroscopy
Gamry Electrochemical Instrumentation and EIS
Electrochemical impedance spectroscopy (EIS) is a technique used in many different areas of electrochemistry including coatings, batteries, fuel cells, photovoltaics, sensors, and biochemistry. Electrochemical impedance spectroscopy is a powerful experimental method utilizing small amplitude, alternating current (AC) signal to probe the impedance characteristics of a cell. This technique measures the impedance of a system over a range of frequencies to generate an impedance spectrum for the electrochemical cell under test.
The theory behind Electrochemical Impedance Spectroscopy is more complex than DC techniques. For more information, read our Application Note "Basics of Electrochemistry Impedance Spectroscopy".
All Gamry potentiostats are EIS capable with 2,3, or 4 cell connections.
We have specialists available that understand Electrochemical Impedance Spectroscopy and can get you pointed in the right direction.
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Reasons To Run EIS
EIS is theoretically complex (and can be expensive) – why bother?
- The information content of EIS is much higher than DC techniques.
- If two or more electrochemical reactions are taking place, EIS may be able to distinguish between them.
- EIS can identify diffusion-limited reactions, e.g., diffusion through a passive film.
- EIS provides information on the capacitive behavior of the system. This is always useful, but particularly for coatings.
Check Your Potentiostat…
- To Understand a System and Its Limits
- Compare 2+ Different Systems
- For EIS: Setup Matters
- Manufacturer Specifications:
- Are Not Standardized
- Do Not Tell the Whole Story