Electrochemical impedance spectroscopy in interfacial studies

•Capacitance spectra of ionic liquid double layers are single arcs on complex plane.•Phase transitions of adlayers exhibit lowered CPE exponents.•General impedance theories for porous electrodes and for RDEs have been published.•Double-layer capacitance is affected by roughness-related energetic inh...

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Bibliographic Details
Published in:Current opinion in electrochemistry 2017-02, Vol.1 (1), p.53-58
Main Authors: Pajkossy, Tamás, Jurczakowski, Rafal
Format: Article
Language:English
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Summary:•Capacitance spectra of ionic liquid double layers are single arcs on complex plane.•Phase transitions of adlayers exhibit lowered CPE exponents.•General impedance theories for porous electrodes and for RDEs have been published.•Double-layer capacitance is affected by roughness-related energetic inhomogenities.•EIS with scanning droplet cell is appropriate for mapping electrochemical properties. An important role of the electrochemical impedance spectroscopy (EIS) is the characterization of the electrical double layer formed at the electrode/electrolyte interfaces. The phenomenological double layer studies with an aqueous and ionic liquid electrolytes are reviewed with a conclusion that the double-layer capacitance is frequency dependent as the rule rather than the exception. We discuss the impedance consequences of the non-uniform current distribution along the electrochemical interface, which also contributes to the apparent frequency dependence of the capacitance. Finally, we show recent articles on non-conventional EIS techniques with high lateral resolution or enabling fast measurements.
ISSN:2451-9103
2451-9111
DOI:10.1016/j.coelec.2017.01.006